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User`s Manual - Lewiston Independent School District #1

1. an poe To All Button fees View Menu Wik A mx 4 gt TH a Map View v K Lanz Zoom To Next Zoom To Selected Button Forw ard Button Figure 5 Zoom and Map View controls Zoom to Previous Back Button Returns the map to its previous location and zoom state My World saves the last ten locations so you can go back at most ten times Zoom to Next Forward Button Returns the map to the location and zoom state it was in before the Back button was pressed Only available when the Back button has been used at least once Zoom to All Button Adjusts the Map so that all the contents of each visible Layer in the Map are visible Zoom to Selected Button Adjusts the Map so that all the contents of the active Layer are visible e Map View Menu allows you to save the current appearance of the Map including which layers are visible and which are hidden how those layers are colored and what part of the map you re looking at You can use this feature to save several interesting views on your data so you can easily re create them later or to save your place in the world before you explore other areas so you can quickly return to the same place later Projection and Scale Controls The projection and scale controls are available in every mode that features a map but you will probably use them most often in Visualize mode The Projection Menu and Map Scale are shown below in figure 6 Albers Equal A
2. My World GIS Version 4 1 Copyright 2007 Northwestern University All rights reserved Created August 15 2002 Last Revised May 8 2007 Developed by the GEODE Initiative Learning Sciences Program School of Education and Social Policy Northwestern University My World GIS is distributed by PASCO Scientific under an exclusive worldwide arrangement with Northwestern University For more information or to purchase My World please visit www pasco com myworld Or contact PASCO via phone or email Within the United States 800 772 8700 Outside the United States 1 916 786 3800 Email sales pasco com This work has been supported in part by the National Science Foundation grants ESI 9720687 0085946 0352478 0333529 and 0422545 However any opinions findings conclusions and or recommendations herein are those of the authors and do not necessarily reflect the views of the National Science Foundation 2 What is My World My World is a Geographic Information Systems GIS application developed by the GEODE initiative using the Java platform It is used for assembling storing manipulating and displaying geographically referenced information i e data identified according to their locations It is intended to provide a useful subset of the features found in professional GIS environments but with an interface designed for use by students and teachers It is also designed to be easier to administer in educatio
3. containing any number of WorldWatcher files whose names must also have the extension wwt The files will be listed as fields of the layer in alphabetical order by file name By default the origin cell size and dimensions of the grid will be those of the file whose name is first alphabetically Those settings can subsequently be adjusted in the Edit Layer Appearance window ASCII Grid files can be very memory intensive so it s better to save your data in WorldWatcher format once you have imported it into My World Image Data File Types My World supports the following types of data files and or folders for reading and writing image data 35 JPEG image a set of two files with the same name and the file extensions jpg and jgw The jpg file contains the image and the jgw file is called the World File and contains information about where on the map the image should be displayed TIFF image a set of two files with the same name and the file extensions tif or tiff and tfw The tif tiff file contains the image and the tfw file is called the World File and contains information about where on the map the image should be displayed My World can only read 1 band and 3 band TIFF files GeoTIFF image a single file with the extension tif or tiff Unfortunately it s often impossible to distinguish GeoTIFF files from regular TIFF files without using a program to open them Sometimes a GeoTIFF will have
4. Marquee Selection Tool Clicking and dragging with this tool will draw a rectangle on the Map When the mouse is released My World will create a new Selection containing any features of the active Layer that are at least partly contained by that rectangle If the active Layer doesn t have any features in the rectangle or if it has no data table the tool will have no effect Lasso Selection Tool Clicking and dragging with this tool will draw a freehand shape on the Map When the mouse is released My World will close that shape create a new Selection containing any features of the active Layer that are at least partly contained by that shape If the active Layer has no features inside the shape or if it has no data table the tool will have no effect Vertical Profile Tool This tool only works when there is a Grid layer with a numeric Field in the Layer List It allows you to draw a line across a grid layer to create a graph of numeric grid values along that line When you first select the tool a dialog appears in which you must select a Grid Layer and its numeric field you want to profile Click on the Map once to start drawing a line Once you have started drawing a line click once to add a new segment to the profile line or double click to stop drawing the line and show the profile graph Zoom Controls amp The Map View Menu Here are the Zoom Controls available in Visualize Mode along with the Map View Menu Zoom To Previous Back
5. Result Population Is Greater Than Or Equal4 the selected To 10 000 000 humans operation Result Name Untitled Space to enter result of the operation J OK Button Figure 13 Analysis Operation Controls The Description of the Selected Operation explains what action the selected operation performs The Controls for the Selected operation are specific to each operation Shown here are the controls for the Select By Value operation The Result Description describes what the result of the selected operation will be given the current settings of its Controls When you are satisfied that the Result Description matches what you re trying to compute press the OK Button to perform the analysis The OK Button may be disabled if the settings for the selected operation s controls are invalid or if there are no layers for the operation to act on in the Layer List 22 8 Selections Selection Controls in the Layer Control Panel Figure 14 below shows a Layer Control Panel in Visualize Mode with its Selections Twist Down twisted down to reveal the Selection Controls for the Layer b e J de ilhali e World Cities Color L Selections Category List A ee v Twist Down T 7 Highlight Mode Color Selected Yellow x Population gt 10 000 00 humans All highlighting off Highlight Buttons Highlight Mode Menu Figure 14 Selection Controls in Visualize Mode When
6. Show Data Documentation Opens a new window with information about the source of the data for the selected Layer Has the same effect as clicking the Show Data Documentation button in Construct or Visualize mode 51 Data Documentation can be edited in the Layer Information window Edit Layer Appearance Opens a window which you can use to change how the active Layer is displayed Has the same effect as clicking the Edit Layer Appearance button on the Toolbar in Construct or Visualize Mode For more information on editing Layer appearance see Section 5 The Edit Layer Appearance Window Show Layer Table Opens a new window containing the data table associated with the active Layer Has the same effect as clicking the Show Table button in Construct or Visualize Mode Delete Field Allows you to delete a field from the active Layer s data table Remove Layer From Map Delete Selection If a Layer is active removes the active Layer from the map If a Selection is highlighted deletes that selection from its containing Layer Which menu item title appears depends on whether a Layer or Selection is active Has the same effect as clicking the Remove button in Construct or Visualize Mode Show Layer Histogram Bar Chart Opens new window displaying a histogram a bar graph of the number of observations per range of values or bar chart showing the number of records per category for the data table of the active Layer Has t
7. reading data from GPS device and imports that data into My World This feature only works on Mac OS X and Microsoft Windows It is not yet implemented for Linux Combine Grid Layers Opens a dialog that allows you to select multiple Grid Layer data files and combine selected fields from them into a single Layer Merge Shape Layers Opens a dialog that allows you to select multiple Shape Layer data files of the same Shape Type and merge them into a single layer 49 oO O Un Project Shapefile s Prompts you to select a shapefile shp or folder of shapefiles choose the projection used by the file s and the parameters for that projection and select a new location to save the un projected data Converts the projected data into unprojected latitude and longitude in decimal degrees the format used by My World and saves the converted data in the new location Layout And Print Opens the Print Preview window which allows you to lay out your map with legends scale information and labels and allows you to print your map to a file in a number of different formats Save Project Saves the current state of the Map to a Project folder or file If the current Map has already been saved to a file or was loaded from a project file it will save to that same file Otherwise it will prompt you for a new file in which to save the Map Save Project As Prompts you for a new file location and saves the current Map to that
8. Add Vertex Tool New Point Tool Figure 18 Tools for editing a Shape Layer The Move Shape Tool and Move Shape Part Tool are used for selecting and moving existing shapes A shape in My World can consist of any number of Points Lines or Polygons Thus a single record in the data table might have multiple features on a Map For example an record representing the United States would have at least nine Polygons one for the continental States one for Alaska and seven for the islands of Hawaii This collection of nine Polygons is considered a single Shape by My World consisting of nine Shape Parts You can select and move them as a group using the Move Shape Tool or select and move the individual parts using the Move Shape Part Tool Each Shape Part is in turn made up of Vertices single points Point Shape Parts consist of a single Vertex Line shape parts each have at two or more Vertices and Polygon Shape Parts must have at least three Vertices You can select and move individual Vertices using the Move Vertex Tool When you select a Vertex it is drawn in red as shown above in figure 17 The location of the selected Vertex is shown in the text boxes at the bottom of the Edit Shapes Panel either in Latitude and Longitude or in Easting and Northing Easting and Northing are simply horizontal and vertical locations respectively in the 2 dimensional plane defined by the current Projection The Projection converts the 3 dimensional L
9. Index contained two files with the same name when My World opened a Data Library containing a file by that name it would have no way of knowing which of the two files was supposed to be in that Data Library 47 When My World launches it searches one or more folders for data files and project files see below for more details and adds everything it finds to the File Index If it encounters two files with the same name it has to either ignore or rename one of the two files because it can t have both of them in the File Index at the same time That is why My World will sometimes ask you to ignore or rename one of two files when it launches In general it is best to rename whichever of the two files you have created more recently as the older file may appear in some Data Libraries and it would be replaced by the newer file if it were renamed Getting My World to Index Your Data My World will always index the data folder inside the My World program folder because that is where the data that comes with My World is installed My World will also look for a data folder inside a folder named MyWorld in the current user s home directory and index its contents if it exists If the current user doesn t have permission to add files to the program data folder My World will automatically create the data folder in the user s home directory so the user always has a place to save his or her files The preferred way of getting My World to ind
10. Table view of a Layer Fill Color Fill Color is the color used to fill in the interior of a Polygon This is distinguished from the Outline Color which is the color used to draw the edges of the Polygon Graticule A Graticule is a type of grid consisting of lines of equal longitude also known as Meridians and lines of equal latitude also known as Parallels Using a 55 Grid Layer cylindrical projection the lines are straight and perpendicular to one another Other types of projections may render them as curved lines A Grid Layer consists of Cells that together entirely cover an area of the Earth s surface The edges of the Cells are rectangular with respect to latitude and longitude which means they may or may not appear rectangular on the map depending on the projection The cells are equal in size with respect to latitude and longitude but not in terms of area of the Earth s surface Cells closer to the poles cover less area than those closer to the equator A Layer is a component of a My World Map Layers are stacked on top of one another to produce the overall appearance of the Map Layers may be transparent to allow you to see the Layers beneath them or opaque to obscure the layers beneath them You can re order the stack of layers at any time by dragging a Layer s Control Panel up and down the Layer List Layer Control Panel A set of controls for displaying and adjusting the appearance of a Layer of the M
11. a bar graph that plots the number of values in each of a set of intervals The Colorscheme menu allows you to change how colors are assigned to intervals For the Symbol Shape aspect the Colorscheme menu is replaced by the Symbol Type menu You can read more about Symbol Types in the Glossary under Symbol The Transparency setting determines how much of the Layers beneath this layer will show through At 0 the Layers beneath this one will be completely obscured At 100 this Layer will be completely transparent The Number of Fill Colors editor determines how many different intervals the range of values is divided into Studies have shown that people find it difficult to discriminate among more than about seven categories so it is recommended that you keep this number relatively low but My World supports up to 512 different values for a given aspect The Reverse button reverses the order of Fill Colors or Shapes etc for example to go from dark to light instead of light to dark or large to small instead of small to large The Interval Table table below those controls lists the Intervals values will be divided into You can modify these ranges manually by typing into the table and you can change the Fill Color of a given Interval by double clicking on the color in the leftmost column The Maximum and Minimum editors These determine the low and high end of the Range of values You can also edit these values in the Interval table but
12. amount in the counter clockwise direction from pointing straight up again 58 16 Frequently Asked Questions FAQ Q I changed the transparency of one of my Layers now it seems to have disappeared Where did it go A If you set the transparency of a Layer to 100 it will not appear at all the Layers beneath it will show through completely To see the Layer again set its transparency to a value less than 100 Q I m trying to enter a value into a table in the Layer Appearance Window the Layer Information Window or the Edit Table Panel but every time I finish typing and click somewhere else it goes back to its original value What gives A Some Java implementations require that you press Return or Enter when you are editing a table before you click elsewhere or the changes will not stick Try pressing Return or Enter after making your changes Q I m trying to enter a Date or Time in Edit mode and My World keeps telling me that the value I m entering doesn t appear to be a Date How I make this work A My World prefers Date and or time values in ISO 8601 format but it will accept values in any of the following formats y year only any number of digits negative values for BCE ye year followed by era BC AD or BCE CE yyyy mm dd ISO 8601 year month day format m d y month day year any number of digits separated by hh mm ss hours minutes seconds two digits apiece separated by hh mm ss am pm
13. and edit existing ones using the Edit Data Libraries Window as shown below in figure 21 by selecting Data Libraries from the Edit Menu All Data Files amp Projects List Library Menu Windows Default Checkbox Use these controls to create and efit Gate Libraries by adding and removing rom the select All Data Files amp Projects Library E Earthquakes Big 6 0 9 0 1994 03 Add Name Earthquakes Earthquakes Medium 4 0 5 9 2001 03 Button SS S B Earthquakes Significant 1900 1994 Ea Hey Earthquakes Big 6 0 3 0 1994 03 E Earthquakes Small 2 0 3 9 2001 03 Earthstructuresintro m3vz gt E Elevation amp Bathymetry ESinquiry20051212 mavz bu Evidence for Plate Movement 7 s SAna see Conveyor ssh ner A Butto ml Save Sawe As ci Close Figure 21 Adding a file to a Data Library in the Edit Data Libraries Window The All Data Files amp Projects list on the left hand side of the window contains every data file and project file that My World is aware of The list on the right contains only those data and project files that are in the Library selected by the Library Menu When the window first opens no Data Library is selected and this list is empty To edit an existing Data Library select it from the Library Menu To create a new Data Library select New from the Library Menu and enter a name for the new Library Once a Data Library is selected
14. edit general settings for that layer The other tabs that appear in the window depend on what kind of layer you are editing In this case we are editing the information of a Shape layer At the top of the General tab is a text box for editing the Layer Name Below that is a text box for Data Documentation In this space you should enter a brief description of the 40 data in the Layer where it came from and who owns the copyright to the data if it is not in the Public Domain Below the Data Documentation area is a check box that allows you to Lock Layer Data If the data is locked any changes that are made to the Layer cannot be saved back to the original data file they must instead be saved to a new file with a new name This is useful for maintaining the integrity of the source data and keeping it separate from any computed or modified data Below the layer locking button there are controls for setting Minimum and Maximum Scales for the layer Some extremely detailed layers can slow down drawing the map when the entire layer is visible so it may be necessary to set the Layer to hide itself when the scale is above a certain value Likewise some low detail layers may look good when you are zoomed out but look terrible when you zoom in on them These layers can be set to hide themselves automatically when the scale drops below a certain value An Edit Information Window for a Shape and Grid Layers will also have a Fields tab as sh
15. geo in its name before the file extension but not always If a tfw file is available the file is probably a regular TIFF and if not then nothing is harmed by putting a tfw file with a GeoTIFF so always keep the tfw file with the tif file if one is available My World can only read 1 band and 3 band GeoTIFF files Links to Dynamic Web Data Using a dynamic web layer requires a working internet connection on which port 80 the port used for World Wide Web traffic is not blocked WMS link a single file with the extension wms_xml The file does not contain any data itself just the address of a server that uses the Web Mapping Service WMS to dynamically provide images to My World THREDDS link a single file with the extension thl The file does not contain any data itself just a link to a THREDDS Server which may provide either shape data or grid data THREDDS stands for Thematic Realtime Environmental Distributed Data Services and is a project of Unidata a community of over 160 institutions vested in the common goal of sharing data and tools to access and visualize that data to support Earth system education and research ArcIMS link a single file with the extension aims_Ink The file does not contain any data itself just a link to an ArcIMS Server which may provide either shape data or dynamic image data ArcIMS Server is a commercial product produced by ESRI and ArcIMS is a registered trad
16. have made the necessary changes to the Layer Information remember to save your changes by selecting Save Layer or Save Layer As from the Layer menu Importing Image Data To display a TIFF or JPEG image in My World you must have a World File for that image My World cannot display an image without a World File A World file for JPEG images must have the same name as the image file and its name must end with the file extension jgw A World File for a TIFF image must have the same name as the image file and its name must end with the extension tfw If you don t have a World File but you know the location of the upper left corner of the image and the size of each pixel you can create a new World File for the image using the Edit Layer Information window The space to enter that information is on the Image Location amp Size tab as shown in figure 25 below Windows ff General Image Location amp Size ii Image Projection Basic z i Upper left Corner x 180 gt 90 in projected units S l y din proj Pixel Size x 0 066667 y 0 066667 in projected units Figure 25 Setting the location and size of an Image Layer 44 As with map data it is also important to know the Units and Projection of image data you are importing My World can display an image even if its projection information is missing or incorrect but the image will not line up properly with other Layers if
17. names or the first row of data My World uses the same CSV format as Microsoft Excel If you want a comma character to appear inside a cell value the entire cell value must be enclosed in double quotes To include a double quote character inside a quoted value use two double quotes in a row Tab Separated Values a single text file with the extension tsv Other requirements are the same as for comma separated files except that tab characters separate the values instead of comma characters If you want a tab character to appear inside a cell value the entire cell value must be enclosed in double quotes To include a double quote character inside a quoted value use two double quotes in a row Once you have chosen the file to import and if necessary told My World whether the first row contains field names or data you will see the the Import Data Window as shown below in figure 28 46 Link Field FIPS v In The Layer Table With Field FIPS In The Imported Data Import Data from A pplications My World GIS 4 1 data UNPopluation tsyv Figure 28 The Import Data window In order to match up rows in your data file with records in the Layer s Data Table you need to pick which field will be used to do the matching Usually the best field for this will be a name but any field that has a unique value for each row and is present in both the Layer Data Table and the data file being imported w
18. notes folder My World also uses the Java Topology Suite JTS library developed by Vivid Solutions JTS is Free Software released under the LGPL license You can access the source code to the library here My World also uses the JFreeChart chart library developed by Object Refinery Limited and Contributors JFreeChart is Free Software released under the LGPL license You can access the source code to the library here My World also uses the Joda Time Library developed by Stephen Colebourne The License for the Joda Time Library can be found in the notes folder For more information on Joda Time see joda time sourceforge net My World also uses the Java Advanced Imaging JAI Library developed by Sun Microsystems The license for the JAI library can be found in the notes folder 60 My World also uses the JOOM Document Object Model Library developed by the JDOM Project The License for the JOOM Library can be found in the notes folder For more information on JDOM see www jdom org My World also uses the Xerces XML Parser developed by the Apache Software Foundation The License for the Xerces Library can be found in the notes folder For more information on Xerces or the Apache Group see www apache org My World also uses the BrowserLauncher class developed by Eric Albert For more information on BrowserLauncher see browserlauncher sourceforge net My World also uses the THREDDS data access libraries developed by
19. same as above plus am or pm hh mm hours minutes two digits apiece separated by hh mm am pm same as above plus am or pm 2 or 3 above followed by any of 5 8 Times you enter are assumed to be in the local time zone My World stores times internally in Coordinated Universal Time UTC and always displays them using the local time zone 59 e Q Can I put images on my Map A Yes As of Version 3 0 My World does support images See Section 12 Importing Image Data for information on how to import new images data My World e Q Where can I find an aerial photo or topographic map for my area A See the online help center for step by step instructions on how to download and import aerial photographs and topographic maps of your area e Q How can I put labels on my Map A Go to Edit Mode and click the New Layer button Select Annotation as the type of the new layer then either select the Layer or Selection you want to label or simply click OK then create the labels one by one See Section 9 Editing Annotation Layers for more information on how to do this If you don t see the answer to your question here try the Online Help Center Acknowledgments Software Early versions of My World were based on OpenMap a toolkit built on the JavaBeans component architecture by BBNT Solutions My World still calls some library functions from OpenMap modified as described in the OPENMAP_README file in the
20. see Section 10 Editing Data Libraries e Project Menu oO Files Opens a window which allows you to add and remove files stored inside the current project Files stored in the current project are accessible using the Link Tool in a special link flag icon that appears in the lower left corner of the map The special link only appears when the Link Tool is selected and when there are files stored in the current project Settings Allows you to edit certain project settings such as the name that appears in the My World window s title bar when the project is open and the background color of the Map The Project Settings window is also where you can delete and rename saved Map Views and edit the Tour associated with the project Projection Is a hierarchical menu that allows you to change the Projection of the Map just like the Projection Menu in the toolbar Sometimes a computer s monitor is too small to use the Projection Menu in the toolbar so in that case the Projection menu item can be used instead For more information on Map Projections see Map Projection Basics e Layer menu O Edit Layer Information Opens a window which you can use to control how the fields columns of the selected Layer s data table are displayed Generally using this window should only be necessary when importing a new data file into My World For more information on editing Layer information see Section 12 Editing Layer Information
21. that are constant for each feature in the Layer as with the Color aspect in the above example e Selections Twist Down Make the Selections for the Layer visible twisted down or invisible twisted up as in the example above Selections are a sub set of the records in the Layer and each Layer can have any number of Selections For more information on Selections see Section 8 Selections Layer Buttons Here are the Layer Buttons available in Visualize Mode Ulimsu ULL visudize Hilaly Le j CUR i i Layer List MEEK Em Show Statistics Show Histogram Show Data Documentation Edit Layer Remove Appearance Figure 3 Layer Buttons in Visualize Mode e Show Data Documentation Button Opens a new window with information about the source of the data for the active Layer e Edit Layer Appearance Button Opens a new window with controls for changing the appearance of the active Layer e Show Table Button Opens a new window containing the data table associated with the active Layer This button is disabled if the active Layer has no data table e Remove Button Removes the active Layer from the map or if the active Layer currently has a Selection highlighted deletes that Selection e Show Statistics Button Opens a new window displaying statistics i e sum median mode standard deviation etc for the data table of the active Layer or if the active Layer currently has a Selection highlighted for the table of that
22. the projection information is not correct You must tell My World what projection the image uses using the Projection tab in the Edit Layer Information window as shown in figure 26 below The website or person you obtained the image from should be able to tell you what projection the image uses Windows General Image Location amp Size Image Projection Standard Pee State Plane Projection Type Geographic v State Plane mm Center Latitude 0 0 Center Longitude 0 0 Ellipsoid WGS 84 v Name Match 4 World Shaded Relief Projected Units Degrees v Figure 26 Setting the Projection of an Image Layer If an image is labeled as unprojected or as having no projection use the Standard tab in Projection Controls and select Geographic as the projection type and Degrees as the units as shown in figure 26 above Be sure to select Save Layer from the Layer menu after setting up an Image s Location and Projection so that My World will remember those settings if you add the Image to another project For information on how to acquire and import aerial photographs and topographic maps of your area visit the online help center Importing Tabular Data If you have Tabular data that is data in the form of a table as opposed to map data you can still import that data into My World by Joining that data to an existing map data file Of course this only works if t
23. the Display Units is only supported for units that My World understands Display Units is where you select what units the values in this field should be displayed For example you might want to display temperature values in degrees Fahrenheit instead of degrees Kelvin The ability to change the Display Units is only supported for units that are built into My World When you save the Layer values in this field will be permanently converted to their Display Units and the Display Units will become the regular Units All unit conversions are completely reversible so no data will be lost in the process Missing Value is only meaningful for numeric fields Frequently a particular number often 99 or 9999 is used to represent a missing value Entering that number here allows My World to treat that number specially when computing statistics and categorizing values 43 If your data file uses empty values rather than using a particular number to represent missing values you should enter NaN short for Not a Number rather than leaving this value blank so that My World knows there are missing values in the field e Display is an on off switch that allows you to hide certain fields from users of your data If there are extra fields that you don t expect people using your data to need you can hide them rather than deleting them That way if those fields become useful at some point in the future you still have them available Once you
24. whose name ends in m3vf containing all of the project s data files included files linked files and all of its appearance settings e Compressed Project File m3vz is a single file containing a m3vf folder that has been compressed using ZIP compression You can examine the contents of an m3vz file by opening it using a program that can read ZIP files such as WinZip While you are working on a project it is best to save it as a m3vf folder because reading and writing to the folder is faster since it doesn t involve compressing the data 37 If you want to share your project with someone using another computer you should save it as an m3vz file because the file will be smaller and it s easier to copy a single file from one computer to another than a whole folder full of files If you are downloading an m3vz file and your web browser unzips it without asking you as Safari sometimes does unfortunately you can simply add m3vf to the end of the name of the resulting folder and open it as a project folder in My World Tour Files A tour is an HTML file that has been specially formatted for My World to break it up into individual screens usually corresponding to steps the user should take as he or she navigates through the tour Tour file names must end with the extension mwht In addition to standard HTML including styles but not CSS My World tour files support several additional tags e lt break gt indica
25. you can add files to the Library by selecting them in the All Data Files list and copying them to the Data Library using the Add Button as shown above in figure 21 You can also remove files from the current Data Library by selecting them and pressing the Remove Button The Default Checkbox determines which Data Library My World will display when it is launched If you are setting up My World for a particular activity you may want to set that activity s Data Library to be the default so that it opens automatically in Construct mode and so is the first thing students see when My World is launched Only one Data 33 Library can be the default so if you check the Default checkbox for one Data Library it will become unchecked for every other Data Library For information on how My World finds the files to fill the All Data Files amp Projects list see Section 13 How My World Finds Data 11 File Types Shape Data File Types My World supports the following types of data files and or folders for reading and writing shape data ESRI Shapefile a set of three files with the same name and the file extensions dbf shp and shx respectively All three files are required Other files such as prj files may be present but My World doesn t require or use them The shapefile must contain unprojected latitude and longitude values in decimal degrees in the range 180 to 180 My World can automatically un project shapefiles as t
26. 17 100 N 2 Milwaukee lus 1 374 700 N Table of Records Keep Records Button Exchange cen A Export maintint on from All eal Keep Records In Table i Exchange Rows amp Columns Export ital Figure 12 The Layer Information Window split in half to fit on the page At the upper left corner of the window My World displays the number of records in the table along with the total number of records in the Layer in parentheses Next to that is the Find Button which displays a search window that allows you to search through the table for a specific piece of text Next to that there are two buttons for creating a new named Selection from the list of records in the table The first Make Selection From Rows is only available if some rows in the table are selected It creates a new Selection containing only those records whose rows are selected in the table In figure 12 above the button is disabled because no rows of the table are selected The second Make Selection From All creates a new Selection that contains all of the records in the table For more information on Selections see Section 8 Selections Normally each time you click on a new feature on the map any records already in the Layer Information Window are replaced by the new feature s record or removed if you clicked on a blank area of the Map However if the Keep Records In Table checkbox is checked records always stay in the table and any new records w
27. Selection This button is disabled if the active Layer has no data table e Show Histogram Button Opens a new window displaying a histogram a bar graph of the number of observations by value for the data table of the active Layer or if the active Layer currently has a Selection highlighted for the table of that Selection This button is disabled if the active Layer has no data table Map Tools Here are the Map Tools available in Visualize Mode Get Move Zoom Measure Lasso Information Map Out Distance Selection Tool Tool Tool Tool Tool Arrow Vertical Tool Profile Tool Link Zoom Re C enter Marquee Tool In Projection Selection Tool ool Tool Figure 4 Map Tools available in Visualize Mode e Arrow Tool Clicking on the map will highlight the value of the feature s you clicked on if any in all visible Layer Legends e Get Information Tool Clicking on the map will display a pop up window with information about the features you clicked on if any in the active Layer Also highlights the value of of those features records in any layer that has visible Legends just like the Arrow tool does For more information on the pop up Layer Information window see Section 6 The Layer Information Window e Link Tool When this tool is selected orange flags appear over each feature in the Map which has a link associated with it Click on one of the flags to display a pop up menu of all the links at that location and select one to op
28. a category by double clicking on the patch of color in the leftmost column You can also change the Name of a category by double clicking on the name and typing The set of Values on the other hand can only be changed by merging the category with another category or by splitting apart a category that contains multiple Values To see how this works begin by selecting the first two Countries in the list and pressing Merge Selected Categories as shown below in figure 10 12 i Glipa Ciit y ny Algeria Argentina E Armenia Armenia Figure 10 Merging categories The two categories are combined into one with the name and the color of the first category as shown in figure 11 below Now Afghanistan and Albania will be drawn in the same color on the Map Pal Gily ay EE Afghanistan L Afghanistan Albania E Algeria Algeria Figure 11 Merged categories You can split the category back into two by selecting it and clicking the Split Selected Category button 13 6 The Layer Information Window This window appears when you click on a Layer s features using the Get Information Tool to display the record s associated with the feature s you clicked on It can also retain records whose features you ve clicked on previously Find Button Make Selection Buttons te 2 Records of 606 Find Make Selection fr Name es Population Capital humans A Chicago US 7 7
29. ain some of the Shapes of the Layer and their associated records For Grid Layers a Selection will contain some of the Cells of the Grid and their associated records Shape A Shape Layer is a type of Layer made up of shapes and their associated records The shapes may be points lines or polygons and the records may consist of numbers names dates web links or other pieces of data Symbol A Symbol is a small icon drawn at a particular point on the map For Point Shape Layers Symbols are drawn so they are centered around each point For Polygon Shape Layers Symbols are drawn at the center of the Polygon There are three kinds of Symbols that My World produces e Map Symbol Symbols are chosen from a set of more or less meaningful shapes including circles stars squares triangles pushpins flags and a number of standard map symbols for such features as campgrounds schools churches mines etc e Pie Chart Symbols are pie charts that range from empty to full The first interval or category will have an empty pie as its symbol the last interval or category will have a full pie as its symbol and intervals or categories in between will have pies evenly spaced from empty to full e Arrow Symbols are arrows which vary in direction The first interval or category have an arrow pointing up and the direction arrows for subsequent intervals or categories will move clockwise by an equal amount so that the last symbol is exactly that
30. ap The order of the Layer Control Panels in the Layer List also serves to determine the stacking order of Layers in the Map You can click and drag a Layer Control Panel within the list to adjust its position in the stack Layer List Lines The Layer List is a collection of Layer Control Panels one for each Layer of the map The order of those Control Panels determines the stacking order of Layers in the Map A Lines Layer is a type of Shape layer where each shape consists of one or more Polylines A Polyline is a series of line segments joined together at their end points Lines layers are often used for representing rivers roads railroads and other linear line like features Map View A Map View is a saved appearance of the Map It captures the appearance of every Layer as well as the current Scale and Projection without saving any of the associated data It can be used to return later to the current appearance and location 56 Natural Breaks Natural Breaks is a method for dividing a range of numeric values into categories The non technical explanation is that it uses a mathematical formula to give you the best breaks between categories for a good map The technical explanation is that it uses an iterative process to minimize the within category variance Computing Natural Breaks may take 5 10 seconds for very large data sets i e those with more than 20 000 records or so Outline Color Outline Color is the color use
31. ap and start fresh with an empty Map You will be prompted to save the current Map if you have made changes to it since the last time you saved it Open Project Prompts you to select a Project folder m3vf or file m3vz and loads the project into the Map You will be prompted to save the current Map if you have made changes to it since the last time it was saved Open Data Library Prompts you to select a Data Library dlb file switches to Construct Mode adds that file to the Data Library menu and selects it Index Folder Prompts you to select a folder and searches that folder for any data and project files that My World can open Creates a new Data Library containing all those files and also adds them to the All Data Files or All Project Files Library as applicable Import Layer From File Prompts you to select a Data File and adds it to the All Data Files Data Library if you are in Construct mode or adds a new Layer to the map using that data file if you are in another mode This menu item will also give you the opportunity to un project or otherwise re format the data if necessary Import Layer From The Internet Opens a dialog with a number of options for downloading data from the internet The options available will depend on settings in the Preferences dialog and on whether or not your copy of My World is licensed for educational use Import Layer From GPS Device Launches a special application for
32. articular place on the Map and the text of the Annotation can be moved separately from the location it s pointing to If the location an Annotation is pointing to is not within its text the Annotation will draw an arrow pointing to that location You can move either the text or the arrow using the Move Annotation Tool Sometimes Annotation will end up overlapping one another especially if they are created automatically by My World using the New Layer button The Declutter button can automatically re arrange Annotations so that none of them overlap However this operation will permanently move your Annotations and can sometimes make things look worse than they did before We recommend using Declutter only with automatically generated Annotations then re arranging the labels manually using the Move Annotation Tool to achieve the best results You can return each Annotation to the current location of the feature it points to by using the Reset button This can be useful if the Declutter button produces bad results It is also very important when you change the Projection of the map because features will often move far away from their original locations when you change projections leaving the Annotation text far away from the feature it points to The Reset button can fix this problem 32 10 Editing Data Libraries My World does not limit you to using only the Data Libraries that come with the software You can create new Data Libraries
33. atitude and Longitude coordinates into 2 dimensional Easting and Northing coordinates You can change the location of the selected Vertex by typing into those text boxes or by clicking and dragging on the vertex in the Map portion of the Edit Shapes Panel as shown in figure 17 above You can also add a new Vertex to a Line or Polygon using the Add Vertex Tool Clicking on the map with the Add Vertex Tool will split the segment of the shape you are currently editing into two parts then add a Vertex to it at the point you clicked Sometimes the segment you would like to add a Vertex to is not the closest segment to the location you want to place the Vertex at In that case click directly on the segment you want to add the Vertex to then use the Move Vertex Tool to move it to the desired location 28 While a Shape Shape Part or Vertex is selected you can use the keyboard to perform some editing operations Press Delete or Backspace to delete the selected shape element or use the arrow keys to move the selected Shape or Shape Part or to select the next or the previous Vertex of the shape Moving adding or deleting a Shape Shape Part or Vertex can be undone by selecting Undo from the Edit menu The Edit Table Panel The Edit Table Panel is where you can edit the values in the layer table that are associated with the selected shape You can edit the values of existing fields or add and delete new fields either by inserting an empty fi
34. ch Institute Inc ESRI Redlands CA and its licensor s Northwestern University is distributing these data under the terms of a license from ESRI The list of these data files and the terms and conditions for the use and re distribution of that data are available here 61 Support My World GIS was prepared with the support of NSF Grants ESI 9720687 0085946 0352478 0333529 and 0422545 However any opinions findings conclusions and or recommendations herein are those of the authors and do not necessarily reflect the views of the National Science Foundation References My World makes use of algorithms from the following publications M Bevis and G Cambareri Computing the Area of a Spherical Polygon of Arbitrary Shape Mathematical Geology Vol 19 1987 Bourke Paul CONREC A Contouring Subroutine Byte Magazine June 1987 George F Jenks and Fred C Caspall Error on Chloroplethic Maps Definition Measurement Reduction Annals of the Association of American Geographers Vol 61 No 2 1971 William H Press et al Numerical Recipes in C Cambridge University Press New York 1992 Joeseph O Rourke Computational Geometry in C Cambridge University Press New York 1998 John P Snyder Map Projections A Working Manual US Geological Survey Professional Paper 1395 US Government Printing Office Washington DC 1987 62
35. cted 23 e Hide Unselected Unselected records features are not drawn selected records features are drawn normally When a Layer Control Panel s Selections Twist Down is twisted down to reveal that Layer s Selection Controls the Layer Buttons Show Table Remove Show Histogram and Show Statistics will act on the highlighted Selection instead of the active Layer unless the highlighted Selection is Show All highlighting off in which case the buttons will all act on the Active Layer as usual Double clicking on a Selection in the list has the same effect as highlighting it and clicking on the Show Table button opening a Selection Window for that Selection The Selection Window The Selection window allows you to examine and modify an existing Selection Windows Highlight Button Selection Name Population 10 000 000 humans 4 Records In World Cities Whose Population Is wm Description Greater Than Or Equal To 10 000 000 humans Vi Highlight 11 Records of 606 Find Bind 2 5 Convert to Layer to Convert to Layer Country Fopulatons Capital humans A 2 620 000 Toar E iy koa teamy T 15 040 000 Russa 1310800 Brazi 10 160000 IN Table Is a Population descending Figure 15 Viewing a Selection in a Selection Window At the top of the window is a text box showing the name of the Selection which you may edit Below that is the text description of how the Selection wa
36. d the New Polygon Tool is for adding new Polygons to a Polygon Layer A Layer may only have one kind of shape in it so only one of these tools will appear at a time You can also add new fields to the Layer s data table Clicking on the New Field button in the Edit Table Panel will open a dialog window that you can use to select whether to copy an existing field or create a new empty field and select what type of empty field you want to create You may also delete the selected field by pressing the Delete Field button This operation cannot be undone so My World will ask you to confirm that you really want to delete the field before performing the deletion 29 Add New Fields From File is used to add data to an existing layer by matching up the records in a new data table loaded from a file to records in the existing layer s data table based on values of one of each Layer s fields For more information on this feature see Importing Tabular Data Editing Grid Layers When editing a Grid Layer the right hand side of the My World window is divided into top and bottom sections as shown in figure 19 below similar to the way it s divided when editing a Shape Layer The top section is used for modifying the grid by painting values or pouring values with a paint can and the bottom section is where you select which field to paint or pour into and what value you want to paint with Project Layer Windows Help paintbrush Pain
37. d to draw the edges of a Polygon This is distinguished from the Fill Color which is the color used to fill in the interior of a Polygon Points A Points Layer is a type of Shape Layer where each shape consists of one or more points Polygon A Polygon Layer is a type of Shape Layer where each shape consist of one or more Polygons A polygon is a region on the map enclosed by three or more straight edges Polygons may also have holes in them Project A Project is a file that captures the overall state of the map including all the Layers their appearance and any Selections associated with them A Map View may also include other files linked to specific features in a Layer or to the project as a whole Projection A Projection is a system for translating the 3 dimensional points on the Earth into 2 dimensional points on your computer screen For more information on Projections see CUNY s Map Projection Basics page Quantiles Quantiles is a method for dividing a range of numeric values into categories Quantiles divides the range up so that each category has the same number of values in it Record 57 A Record contains all the information about a single member of a Layer other that its location and shape on the Map A Record contains a value for each Field in the Layer Records correspond to rows in the Table view of a Layer Selection A Selection is a subset of the records of a Layer For Shape Layers a Selection will cont
38. e or sex o Economic information about the economic activity of people such as the Gross National Product of a country If the field s data doesn t fall into any of the listed categories you can just choose Other or select New from the category menu and create a new category Subcategory is currently not used by My World but we plan on eventually using this space to hold temporal time information about each field such as when the data was collected or what date or range of dates the data is valid for If you have that information we suggest you enter it here to take advantage of those new features when they are completed But it s not necessary to do so Data Type is not editable It tells you what kind of values the field has in the data file Effective Type is editable and tells My World how to treat the values of the field For example you might have an field that contains Number values but you want to treat them as Text instead You can do this by selecting Text as that field s Effective Type When you save this Layer values in this field will be permanently converted to their Effective Type so be cautious when using this feature You may want to make a copy of the field in Edit mode first Format is also only meaningful for numeric fields It determines how numbers will be converted to text when they are displayed Here are the four built in choices and how some numbers are displayed using each Built In Formats De
39. e polygons that contain all the area within a given distance from the features of a given Layer or Selection It provides a menu for choosing the input Buffers may be created outside Lines and Points and either inside outside or surrounding the edge of Polygons Bf Dissowe Dissolve creates a new layer by combining records that have a the same value in a selected field dissolving the borders between their features if they touch one another gt Summarize Summarize creates a new Data Table by summarizing values in an existing Layer or Selection s Data Table combining records that have the same value in a selected field This operation is similar to Dissolve but it creates only a Data Table instead of a whole Layer CI Advanced 12 A ha Convert Selection to Layer Convert Selection to Layer creates a new Layer consisting of only the records in the chosen Selection The new Layer s Data Table contains the same data as the source layer but only for the records in the Selection Convert Selection To Layer can convert a Grid selection to a Shape Layer but cannot turn Shape Selections into Grid Layers 19 O BY Convert Polygons To Points Convert Polygons To Points creates a new Point layer from a Polygon layer by placing a point at the Centroid center of gravity of each polygon copying all the values from that Polygon s record in the Data Table to the new Point s record CI Make New Grid Bi By Interpolatio
40. ecially useful for comparing two different fields of a Grid Layer or two different Grid Layers for that matter New Notes Window Opens a Notes Window a simple text document editor for saving notes about your work in My World Your notes can easily be saved inside the current project so you can come back to them later The remainder of the Windows menu consists a list of all the currently open My World windows Select a window s name from the menu to bring it to the front e Help menu oO oO My World Help Opens the document you re looking at right now Welcome Window Re opens the Welcome Window the window full of links to documentation that opens automatically when you launch My World About My World Opens the small splash screen with version and copyright information Enter License Key Allows you to upgrade from a trial version to a fully licensed version of My World or to renew an expired license Online Help Center Opens My World s Online Help Center where you can find help on additional topics not covered in this document in your default web browser Online Data Center Opens My World s Online Data Center where you can download additional data not included in the default installation of My World in your default web browser 53 o Online Activity Center Opens My World s Online Activity Center where you can download complete activities using My World in your default web browser A
41. eld copying an existing field or importing new data from a file Only one record in the Layer may be selected at a time and that records s row in the Edit Table Panel will be highlighted to show that it is the selected record Also one field may be selected and its column will be highlighted to show that it is the selected field In figure 17 above Hawaii is the selected record and Name is the selected field You can change the selected record by clicking on a shape in the Edit Shapes Panel with one of the editing tools or by clicking on that record s row in the Edit Table Panel You can edit the values in the table for the row you are editing by clicking on the value in the table Press Return or Enter to stop editing You may also delete the selected record by pressing the Delete Record button This operation cannot be undone so My World will ask you to confirm that you really want to delete the record before performing the deletion In addition to editing existing data you can use Edit Mode to create new data You can add a new record to the layer by clicking on the New Record button in the Edit Table Panel To add new shapes to an record click on its row to select it then use one of the New Shape tools The New Shape tool that appears in the toolbar will depend on what kind of layer you re editing the New Point Tool is for adding a new Point to a Point Layer the New Polyline Tool is for adding new Polylines to a Line Layer an
42. emark of ESRI Inc 36 The ability to connect to an ArcIMS server is only present in registered copies of My World licensed for educational use Annotation File Types My World supports the following types of data files and or folders for reading and writing annotations e My World Annotation file a single file with the extension mwa Annotation files are My World specific no other programs are likely to be able to open them My World Annotation files contain only Annotation data Additional Layer Files In addition to the data files specific to the particular file type My World will add two new files when it saves a layer Both of these files will have the same name as the layer s data file s but a different file extension e The Layer File ends with the extension myl and contains information about how by My World should display the data file such as default appearance settings for each field and information about each field such as its category and units If you lose or delete the Layer File My World will still be able to read the data file but any appearance settings you might have customized will be re set to their default values e The Data Documentation file is a text file txt file which contains information about where the data came from who owns it and where to look for more information about it Project Files My World can save two different types of Project files e Project Folder m3vf is a folder
43. en that link A link may be to a Web Page a picture a movie or any other kind of file e Move Map Tool Clicking and dragging moves the contents of the map allowing you to see parts of the map that aren t currently visible e Zoom In Tool Clicking once zooms in on the clicked point Clicking and dragging draws a rectangle then zooms in on that rectangle when you release the mouse button e Zoom Out Tool Clicking once zooms out and centers on the clicked point Clicking and dragging draws a rectangle then zooms out and centers the map on the center of the rectangle e Re Center Projection Tool Some map projections can only display features within a certain distance from their center and some projections distort shapes in different ways depending on the shapes location relative to the center of the projection You can use this tool to change the center of projection to change the visible area or to minimize projection related distortion e Measure Distance Tool Allows you to measure distances on the map Click once to start measuring Each subsequent click adds a new segment to the measurement line The length of the current segment and total length of the measurement line are displayed in the status bar at the bottom of the My World window Double click to stop measuring Distances are measured in great circles on a spherical Earth using the equatorial radius of the WGS 84 Datum and are only accurate to within approximately 10 meters
44. ex your data is to put it in one of those two locations If for some reason you can t put your data in either of those locations My World can still index it in one of two ways e Add the folder containing your data to the list of folders My World searches at startup using the Preferences item in the Edit menu My World will always search the data folders at startup but you can also tell it to search additional folders anywhere on your computer using the Preferences dialog Use this option if you will be using data in that folder on a long term basis e Manually index the folder containing your data by selecting Index Folder from the File menu and choosing the folder or disk containing your data Use this option if you are using data in that folder only for the duration of your My World session as the folder will not be automatically indexed the next time My World is launched When you manually index a folder this way My World will create a new Data Library with the same name as the indexed folder containing all the files it found in that folder If you open a Data Library that contains a reference to a file that is not in the current index My World will allow you to find the file manually by using a File Chooser If you successfully find the file it will be added to the current index but only until you quit My World 48 14 The Menu Bar File menu oO New Project Clear all Layers and Selections from the current M
45. fault Fixed Point Scientific Zip Code 3 124 3124 3 124e3 03124 1 000 000 1000000 1 0e6 99999 0 0 000001 1 0e 6 00000 3 141 3 14159265359 3 14159265359 00003 42 The Format menu also allows you to create a Custom Format At its most basic a custom format consists of some combination of 0 representing a digit that is always displayed representing a digit that is only displayed if necessary and representing the decimal separator For example you might use 0 00 or 0 as formats for displaying monetary values less than 10 The Format also determines how numeric values are converted to string values when a field s effective type is changed from Number to String Units is only meaningful for numeric fields It should describe what measurement units the values in the field represent My World understands the units for many different kinds of quantities You can enter the abbreviation of the field s units directly into this row in the table and My World will make the text bold if it recognizes the units as shown below in figure 24 Unit symbol is bold which means that My World recognizes the units Select Units Button Figure 24 Editing Units You can also press the Select Units button which will display a dialog box that lists all of the units that My World understands along with several ways for creating new units It is not required that you select units that My World understands but the ability to change
46. he Edit Appearance window is the same for all of these Layer types Other Layer types have very few or no appearance settings that can be customized in the Edit Appearance window Figure 6 below shows the basic structure of the Edit Appearance window for Shape and Grid Layers Windows Layer Name Editor gt Layer Name orld Cities Aspect Tabs Shape Size Color CategoryList Aspect Field Choose Shape by Uniform X Field Controls H Shape g Apply Button gt Close Figure 7 The basic structure of the Edit Layer Appearance Window e The Layer Name Editor is used to change the name of the Layer e The Aspect Tabs are used to select which aspect of the Layer s appearance is being adjusted e The Aspect Field Menu is used to choose which of the Layer s fields will be used to determine the appearance of the chosen aspect If Uniform is chosen as in figure 7 above the appearance of the chosen aspect will be the same for every feature in the Layer e The Field Controls are used to adjust how the selected field determines the selected aspect of the Layer s appearance When Uniform is chosen instead of a field in the Layer as in figure 7 above the controls are used simply to set the appearance of the chosen aspect e The Apply Button is used to apply the selected changes to the Layer s appearance and re draw the Map None of the changes you make in the Edit Appearance Window wi
47. he rows of your table correspond to records in the map data but it s a powerful way to add value to the data files included with My World To join data to an existing file you ll first have to add that file to the Map to create a Layer 45 then switch to Edit mode and double click on the Layer s Control Panel to begin editing the Layer Click on the Add New Fields From File button in the Edit Table Panel as shown below in figure 27 New Record Delete Record New Field Delete Field Add New Fields From File Figure 27 The Import Data button This will open a File Chooser window where you can choose the file you are importing My World can import tabular data from three types of files dBase Files this is the type file used to hold tabular data for ESRI Shapefiles This format can be written and read by many commercial database and spreadsheet programs It consists of a single file with the dbf file extension dBase files are binary files which means they can t be read with a text editor You need a database or spreadsheet program or My World to edit the values in the file Comma Separated Values a single text file with the extension csv and comma characters separating each value The first row of the file may list the column names or it may be the first row of data When you import a CSV file My World will show you the first row of the file and ask you if it contains column
48. he same effect as clicking the Show Histogram button in Visualize Mode Show Layer Statistics Opens new window displaying statistics i e sum median mode standard deviation etc for the data table of the active Layer Has the same effect as clicking the Show Statistics button in Visualize Mode Save Layer Saves the active Layer to the data file it came from If the active Layer was created by analysis and didn t come from a data file or if the Layer s data files is locked prompts you for a new file to save the data in Save Layer As Prompts you for a new file and file type and saves the active Layer to that file in the selected format 52 e Windows menu oO Welcome Window Re opens the Welcome Window the window full of links to documentation that opens automatically when you launch My World Memory Monitor Opens a window that displays information about how much of your computer s memory My World has claimed and how much of that memory My World is currently using If you re having trouble with My World running out of memory this can help you diagnose exactly which Layer or Analysis tool is causing the problem New Child Window Opens a Child Window a floating window which contains a Map with the same data as the Map in the main window with all the same appearance characteristics You may then modify the appearance of the main window s Map but the Child Window s map will remain the same This is esp
49. hey are imported but you must know the original projection for this to work Import the data using the Import Data From File button or menu item to access the un projection tool My World supports Point Arc line Polygon and MultiPoint shapefiles Comma Separated Values a single text file with the extension csv and comma characters separating each value The first row of the file should list the field names and the first two columns must be latitude and longitude respectively in decimal degrees in the range 180 to 180 When you import a CSV file My World will give you the opportunity to re arrange the columns so that latitude and longitude are in the proper place My World uses the same CSV format as Microsoft Excel If you want a comma character to appear inside a cell value the entire cell value must be enclosed in double quotes To include a double quote character inside a quoted value use two double quotes in a row CSV files can only contain Point data Tab Separated Values a single text file with the extension tsv Other requirements are the same as for comma separated files except that tab characters separate the values instead of comma characters If you want a tab character to appear inside a cell value the entire cell value must be enclosed in double quotes To include a double quote character inside a quoted value use two double quotes in a row 34 TSV files can only co
50. hose features you click on are added to the top of the table or moved to the top of the table if they are already in 14 it So the record whose feature you ve most recently clicked will be listed at the top of the table unless the table is sorted Checking the Exchange Rows amp Columns checkbox will cause the table to be transposed displaying each record as a column and each field as a row This is useful for tables that have very few records and many fields because it can make better use of the space available to fit more information on the screen at once The Export button allows you to save the table to a file that can be opened for example in Microsoft Excel for further analysis 15 7 Analyze Mode Analyze mode is where you perform analysis on your Map data In Analyze mode the Map is not visible on the left side of the My World window is a list of analysis operations to select from and on the right side are controls for adjusting the options for the selected analysis operation The following are the analysis operations as they appear on the left hand side of the My World window in Analyze mode e Select ii By Value Select By Value creates a new Selection with records chosen based on their value in a particular field in their Layer s data table HF By Comparing Values Select By Comparing Values creates a new Selection with records chosen by comparing their values in two fields in their Layer s data table
51. ill work If both tables have an field called FIPS or FIPSCODE that will usually be the best field to use for matching rows FIPS stands for Federal Information Processing Standards a service of the National Institute of Standards and Technology which assigns a unique identifier to each city county state province country etc for this exact purpose i e enabling sets of data in different files to be joined together Use the two menus at the top of the Import Data window to choose the field from the Layer Table and from the imported data which are to be linked For those of you familiar with databases My World is performing an Inner Join on the new data and Layer data If a record in the Layer matches multiple records of the imported data only the data from the first match will be used 13 How My World Finds Data The File Index To make it possible to copy Data Library files from one computer to another My World uses a File Index to associate file names with actual files on your computer The Data Library file only contains the file names making it possible to copy the Data Library file and its associated data files from one computer to another without ever worrying about the file paths on the two computers being the same The File Index takes care of mapping the file name to an actual file on disk This introduces a significant limitation on the File Index The File Index can t contain two files with the same name If the File
52. ll appear on the map until you press the Apply button For the purposes of Layer Appearance there are two major types of Layer Fields Numeric Fields which include numbers and dates and Categorical Fields which include text values boolean true or false values and web links Choosing Appearance by a Numeric Field Choosing the appearance of a Layer s aspect using a Numeric field is done by assigning colors shapes etc to Intervals of values You can see an example of this in figure 8 below Layer Name orld Cities Shape Size Color Category List Choose Color by Population Y Copy Show Histogram Bar Chart Colorscheme E os Transparency 0 Number of Colors 4 E Reverse _ Infinity 1 012 1 012 _ 5 905 761 5 _ 905 761 5 11 810 511 11 810 511 17 715 260 5 17 715 260 5 23 620 010 i 23 620 010 Infinity i 99 Minimum 1 012 Reset To Defaults Maximum 23 620 010 Classify By Equal Interval v Figure 8 Choosing an aspect of appearance Color using a Numeric Field Population 10 The Copy button allows you to copy all of the settings from this field to one or more other fields This is especially useful for Grid layers which often have a series of similar fields that you want to display using the same colorscheme and scale The Show Histogram Bar Chart button opens a new window with a Histogram for the selected field a Histogram is
53. location By default projects are folders with the extension m3vf If you select the Compress Into A Single File option the project will instead be saved in a single file with the extension m3vz If any of your layers use Link fields you may want to include the linked files in the project folder file This will increase the size of the project but it will ensure that the file will work properly on other computers Quit Exits My World e Edit menu oO Undo Undoes the previous editing operation Only some operations e g changing a shape or data table value in Edit mode deleting a Selection can be undone Redo Re does the last operation that was undone Cut Places a copy of the selected text or shape on the Clipboard and then deletes it Copy Places a copy of the selected text or shape on the Clipboard without deleting it Paste Places the contents of the Clipboard into the selected text box or shape record 50 oO O Preferences Opens the Preferences Dialog which you can use to change the default measurement units and background color and to customize the RAM usage and startup behavior of My World Colorschemes Opens the Colorschemes Dialog which you can use to edit the Colorschemes available for choosing map colors and create new Colorschemes Data Libraries Opens the Edit Data Libraries window where you can add or remove data files from existing Data Libraries and create new Data Libraries
54. m GPS Button launches an application for loading waypoints from a Garmin GPS device directly into My World For more information on getting GPS data into My World see the PASCO GIS page To start editing a layer double click on its Control Panel in the Layer List Once you begin editing a layer the options available will depend on what type of layer you are editing Editing Shape Layers When editing a Shape Layer in Edit Mode the right hand side of the My World window is divided into the Edit Shapes Panel and the Edit Table Panel as shown below in figure 17 26 Project Layer Windows Help Msualize Analyze Edit Shapes 9 gt 4 Table Panel Latitude se ae al Latitude 19 55 Longitude 4542 coor Dalat Racord i New Field tes Delete Fiald male Add News Fiald From File Name Abbreviation Farr ae 57 1 1 5 Hawaii CHI 4 075 1 Alaska AK EIE ld Bee cation 161 5718 WW 24 4047 N Projection Miller Cylindrical Seale 1 5 726 450 Figure 17 Editing a Shape Layer in Edit Mode The Edit Shapes Panel The Edit Shapes Panel is where you can use the mouse to modify existing shapes and to draw new ones Several new tools appear in the Toolbar for this purpose when you are editing a Shape Layer 27 New Polygon Tool New Polyline Tool m fede ARFER Wr Move Shape Move Shape Pant Tee Move Vertex Tool Tool
55. n Make Grid From Points by Interpolation creates a new Grid Layer where the values of each grid cell are estimated based on the values at the points in a given Point Layer or Selection from a Point Layer The estimate can be calculated by Inverse Distance Weighted which takes a weighted average of either the k nearest samples or of all samples weighted by the square of their distance from the interpolation point or by Simple Kriging which builds a model Variogram a model of the relationship between variance and distance then uses that to weigh the averages of the k nearest samples By Counting density Make Grid From Points by Counting density creates a new Grid Layer where each grid cell will have as its data the number of points in a given Point Layer or Selection contained by that cell as well as the sum or average of all the numeric data for those points contained by the grid cell You may choose the size of the grid and the number of cells or the number of cells and the size of each cell other values will update automatically and whether to sum or average the values of points within each cell By Resampling An Existing Grid Make Grid By Resampling An Existing Grid allows you to change the location and or cell size of a Grid layer Those settings can be modified in the Edit Layer Information window for Grid Layers but changing values there does not affect the underlying data To resample the underlying data to a new resol
56. n the range 180 to 180 rather than 0 to 360 If your data uses another projection or different units you can use My World to un project and convert it to the proper units by selecting Un Project Shapefile from the File menu or by clicking the Import Data From File button in Construct mode My World accepts projected grid and image data but you must know all the details of the projection used to project that data before you can use it in My World Once you have the data in the proper file format units and projection you need only copy it into the data folder inside the My World folder and re launch My World The new data file will appear in the All Data Files Data Library The Import Data From File button that appears in the Toolbar in Construct mode will also add the chosen file to the All Data Files library If the data file is not located in the data folder or in another folder that My World is configured to search when it launches that file will disappear from the Data Library the next time My World is launched See Section 13 How My World Finds Data for more information on how My World searches for data and why your data files should go in the data folder Now You re ready to add the new data to your map and proceed to edit the Layer s information 39 Editing Layer Information Almost as important as the data itself is how that information is formatted and displayed You can control most aspects of
57. nal computing environments For more information on what a GIS is and how it can be used see the US Geological Survey s GIS poster My World is a trademark of Northwestern University Java is a registered trademark of Sun Microsystems Inc What is the GEODE Initiative The GEODE Initiative is dedicated to the improvement of Earth and environmental science education through the use of data visualization and analysis tools to support inquiry based pedagogy Through an integrated program of research and development the GEODE Initiative is advancing our understanding of learning in the Earth and environmental sciences design of curriculum and educational software and teacher professional development Equally important the GEODE Initiative is creating useful and useable products for students and teachers at levels ranging from middle school through college 3 Construct Mode File Edit Project Layer Windows Help Construct Visualize Analyze Eat lt My World Modes f Dats Library Map af h u oe S5 me a Leray Mona amp A e gt gt a 4 World Shaded Rehe E Continents E Countries Layer Buttons Pia co E Countries with Demo Day Night Hi Elevation amp Sathymet Drag a project or data fle E Lakes from a Data Library on iB Lines of Latitude amp Lot the left into this area gt Rivers to construct a map E orld Cities Data Library Layer List Map A TP av i i Status Bar C
58. nheit into the categories Cold Temperate and Hot Ke By Computing Distance Add Field by Computing Distance adds a field to one Layer whose value for each record is the shortest distance between that record s feature and the nearest feature in a second Layer or Selection If the second Layer is a Polygon Layer the distance is always measured from the edge of the polygon so that the distance value for features contained by a polygon will represent the distance to the nearest edge fF By Selection Membership Add Field By Selection Membership adds a new field to a Layer with one value for records contained in a given Selection and a different value for records not in that Selection Essentially it turns a Selection into a field This is useful for when you want to customize the appearance of a Layer s features based on membership in a Selection or when you want to use the results of a Selection in a Math Operation 18 C Create Chart 2 Scatter Plot Create Chart by Scatter Plot allows you to plot two fields in the same Layer or Selection against one another to see if there is a relationship between them It includes the ability to compute the correlation coefficient and linear relationship of two fields Vertical Profile Create Chart by Vertical Profile allows you to create a profile of grid values along Lines in a Line layer GD y Make Buffer Around Make Buffer creates a new Layer consisting of one or mor
59. ntain Point data GPX Waypoint File a single xml file with the extension gpx This file is used for importing GPS data into My World If you need to import data from a GPS device not supported by My World s built in GPS importing functionality the easiest way to accomplish it is to save the data in GPX format My World can read GPX files but it does not support saving data in GPX format Grid Data File Types My World supports the following types of data files and or folders for reading and writing grid data ASCII Grid file a single file with the extension asc Folder of ASCII Grid files a folder whose name ends with asc containing a set of ASCII Grid files whose names must also have the extension asc The files will be listed as fields of the layer in alphabetical order by file name By default the origin cell size and dimensions of the grid will be those of the file whose name is first alphabetically Those settings can subsequently be adjusted in the Edit Layer Appearance window NetCDF file a single file with the extension nc My World only supports NetCDF files that use the Unidata Common Data Model Also My World can only read NetCDF files it cannot currently write data in NetCDF format WorldWatcher Grid file a single file with the extension wwf WorldWatcher is a GIS that only handles grid data It was the predecessor to My World GIS Folder of WorldWatcher files a folder whose name ends with wwf
60. o By Spatial Relationship 2 Ha By Distance Select By Distance creates a new Selection with records chosen by their features distance on the map from features in another Layer or Selection oy By Crossing Select by Crossing creates a new Selection with records chosen based on whether or not their features cross or overlap features in another Layer or Selection Si By Containment Select by Spatial Containment creates a new Selection with records chosen by whether or not their features partially or completely contain or are contained by features in another Layer or Selection 16 ByLatitude amp Longitude Select by Latitude amp Longitude creates a new Selection with records chosen by whether or not their features lie within a specific range of latitude and longitude values e CI Combine AP intersect If the inputs are two Selections from the same Layer computes the list of records the two Selections have in common If the inputs are two Polygon or Grid Layers or Selections from two different Polygon or Grid Layers computes the area that the two have in common union If the inputs are two Selections from the same Layer computes the combined list of records of two Selections If the inputs are two Polygon or Grid Layers or Selections from two different Polygon or Grid Layers computes the combined area of the two inputs Subtract If the inputs are two Selections from the same Layer com
61. ocation of the Map to see different parts For a more detailed description of these buttons and tools see Section 4 Visualize Mode 4 Visualize Mode Visualize Mode looks very similar to Construct Mode except that the Data Library is not present Legend panels may appear below and or to the right of the Map and there are more buttons in the Toolbar Also each Layer s Control Panel contains more details about that Layer Layer Control Panels Layer Name Show Hide das y Remove Layer Button World Cities coor mmm Category List L Selections Twist Down Legend Buttons Figure 2 Parts of the Layer Control Panel in Visualize Mode e Example Icon Shows what features in this layer look like on the map i e what color shape size etc e Layer Name The name of the layer You can edit the name by making the layer active and clicking the Edit Layer Appearance button e Remove Button Removes the Layer from the Layer List and the Map e Show Hide Layer Button Makes the Layer visible if checked or invisible if unchecked e Aspect Menus Adjust how each aspect of the Layer s appearance is determined In the example above the Size aspect is determined by the Population field and the Color aspect is constant red for each feature e Legend Buttons Make the legend for each aspect of appearance visible when colored in or invisible not colored in Legends are not shown for aspects
62. own below in figure 23 This is used to set up the appearance and behavior of the Layer s Data Table Name Count Population Capital Name Name Country Population Capital Category Political Geography Political Geography Population Political Geog Subcategory Data Type Text Text Number Text Effective Type Text Text Number Text Format Default Default Default Default Units N A INIA humans N A Display Units N A INIA humans N A Missing valuel N A jaa O NA Display M iv er Find amp Replace Figure 23 The Fields tab of the Edit Layer Information window The Fields tab consists of a table whose columns represent the Fields of the layer and whose rows represent aspects of each Field s behavior that can be customized The rows are used as follows 41 Name is used to give the field a more descriptive name than is present in the data file Category is the general category of data the field falls in This is used by the Data Library to list fields by category Some categories your data may fall into include o Physical Geography information about the physical characteristics of the features such as their length height area etc o Political Geography political information about features on the map such as their names what state or country they belong to etc Population information about population Demographic information about sub groups of people such as those of a particular rac
63. putes a new Selection with the records from the first Selection that are not in the second Selection If the inputs are two Polygon or Grid Layers or Selections from two different Polygon or Grid Layers computes a new polygon containing the area of the first minus the area of the second EF Clip Features Creates a new layer by cropping all features of the first input Layer or Selection to retain only those portions that lie inside the second input Layer or Selection which must consist of Polygons discarding any records whose features lie completely outside the clipping area 17 CJ Add Field s to Layer H f By Math Operation Math Operation can compute the sum difference average etc of two or more fields of a Layer s data Table The resulting data can be used to create a new field or copied into an existing field By Copying Values Add Field by Copying Values copies values from one Layer s data table to another s based on the containment relationship of their features For example you can use this operation to copy population information from cities Points to the states Polygons that contain them or vice versa E By Reclassifying Add Field by Reclassifying allows you to create a new field from an old one by dividing the old field s values into classes each of which becomes a value in the new field For example you could classify a range of numeric temperature values from 20 to 110 degrees Fahre
64. rea Conic Azi muthal Equal Ares Azimuthal Equidistant Cylindrical Equal Area Equidistant Conic Seographic Projection Menu By onomonic Lambert Conformal Conic 4 Mercator Projection Mller Cylindrical Scale 1 100 000 000 Map Scale Figure 6 The Projection and Scale controls The Projection Menu allows you to select what Map Projection is used to convert three dimensional geographical coordinates to two dimensional pictures on your computer screen For more information on Map Projections see Map Projection Basics The Map Scale control shows you the scale of the map currently displayed on the screen For example in figure 6 above the map scale is 1 100 000 000 which means that one inch on the computer screen is equivalent to 100 000 000 inches on the surface of the earth around 1 578 miles You can type into the field and press Return or Enter to change the current scale of the Map 5 The Edit Layer Appearance Window The Edit Layer Appearance Window is used for making finer adjustments of a Layer s appearance than are possible with the Layer Control Panel The controls available in the window will vary depending on the type of Layer what aspect of a Layer s appearance you are adjusting and what kind of field you are using to determine the appearance of that aspect In this section we will examine the Edit Appearance window for Point Line Polygon and Grid Layers because the basic structure of t
65. s created which cannot be modified and a Highlight Button that allows you to highlight or un highlight the Selection 24 Below that the window looks very similar to the Layer Information Window The only difference is that this table lists only the records in the Selection instead of the records whose features you ve clicked on with the Get Information Tool As shown in figure 15 above you can Sort the table in either ascending or descending order by a particular field To sort the table click on the column header containing the name of the field Click once to sort in ascending order lowest to highest click again to sort in descending order highest to lowest as shown above in figure 15 and click a third time to turn sorting off This works for any table in My World except in Edit Mode 25 9 Edit Mode Edit Mode is where you can edit Point Line or Polygon Grid and Annotation Layers Point Line and Polygon Layers are know collectively as Shape Layers The Layer List in Edit Mode works like the list in Visualize Mode except that it only lists Layers that can be edited and it has a different set of action buttons available as shown below in figure 16 Import From GPS Button Figure 16 Layer List Buttons available in Edit Mode The New Layer Button as its name suggests is used to create a new layer It displays a dialog box with controls for creating new Shape Grid and Annotation layers The Import Fro
66. t Can Tool Tool Eyedropper Edit Field January Delete Add Fie E Oe eaten zation 128 1137 WV 24 905 N Projection Match Average Surface Temp w Figure 19 Editing a Grid Layer in Edit Mode The Paintbrush Tool is used to paint the selected value in this case 22 into the grid ina square whose size is determined by the Brush Size setting The Paint Can Tool is used to pour values into the grid Clicking on the Grid with the Paint Can Tool will fill the grid cell you click on with the selected value then fill any 30 adjacent cells whose value is the same as the cell you originally clicked on then continue filling until it encounters a cell with a different value or reaches the edge of the grid The Eyedropper Tool selects the value of whatever grid cell you click on in the value selection panel below the grid so you can use it to paint or fill in a different place You can access the Eyedropper tool any time you are using the Paintbrush or Paint Can tool by holding down the Alt key also known as the Option key on the Mac Editing Annotation Layers When editing an Annotation Layer the My World window in Edit mode appears as shown in figure 20 below Project Layer Windows Help ext Annotation Annotation Tool Tool Tool tu hited States Source Layer Menu R ay i C Fee Source Countries Source Field Name i x Dectutter Reset Declut
67. ter amp Reset Buttons Font Lucida Sans w FontSize 9 0 v Style Plain w Alignment Lett v Text Color ii Edit Background Color B Edit Annotaion Appearance Controls Figure 20 Editing an Annotation Layer in Edit Mode You can create a new Annotation using the New Annotation Tool When you click on the Map using the New Annotation Tool My World may create a new annotation at the 31 location where you click depending on what is selected in the Source Layer Menu and Source Field Menu If the Source Layer is None then an empty Annotation will always be created when you click on the Map and you will have to enter the text for each Annotation yourself If a Layer is selected in the Source Layer Menu My World will only create an Annotation when you click on an feature in that Layer and the Annotation it creates will have the value of the field selected in the Source Field Menu as its text For example in figure 20 above the Source Layer is Countries and the Source Field is Name so when you click on a country in this case the US My World creates a new Annotation with that country s name United States as its text To change the text of an Annotation once it has been created you can click on the text using the Edit Text Tool To stop editing the text and save your changes press the Return or Enter key on your keyboard or just click on the Map outside of the text Each Annotation points to a p
68. tes where the break between one tour section and the next should occur This tag may occur any number of times but only between the lt body gt and lt body gt tags of the document e lt size number number gt indicates the preferred window size for this tour This should occur only once between the lt head gt and lt head gt tags of the document In addition to these special tags My World also supports several special hypertext references you can use in your anchor tags in a tour document e project the link will cause the My World window to switch to Construct Mode and select the All Projects Data Library from the Library menu Example lt a href project gt Open Projects Library lt a gt e welcome will close the current tour and re open the Welcome Window Example lt a href welcome gt Return To Welcome Window lt a gt To see more examples of what a tour file should look like take a look at the files in My World s tours folder 38 12 Importing Data Importing Map Data There are two important things to assess about map data you d like to import into My World 1 File Format The data must be in one of the File Formats supported by My World You may need to use another program to convert the data into a format that My World understands 2 Units amp Projection My World accepts shape data only in Unprojected Latitude and Longitude in Decimal Degrees and the longitude must be i
69. that using the Layer Information window It is very important that you open this window and customize the settings whenever you import a new data file A number of features of My World depend on the information in the Layer Information window being accurate and the only way to ensure that the settings are accurate in every project the Layer appears in is to set it up properly when you first import the layer Once this information has been entered don t forget to select Save Layer or Save Layer As from the Layer menu or you will have to re enter all of the settings in the Layer Information window the next time you add the data file to a project To open the Layer Information window make the target layer active then select Edit Layer Information from the Layer menu You will see a window similar to the window in figure 22 below Windows Layer Name World Cities Data Documentation Contains locations of major cities around the world The d lt national capitals for each of the countries in the Countrieg as major population centers and landmark cities Derived database and supplemented with other data fromthe Ra International Atlas sae v Lock Layer Data Scale Range _ Hide Layer When Map Is Zoomed In Closer Than 1 _ Hide Layer When Map Is Zoomed Out Farther Than 1 Figure 22 The General tab of the Edit Layer Information window Every Layer s Edit Information Window has a General tab to
70. the Selection Controls are visible a Selection may be highlighted by selecting the Highlight Button next to its name For example in Figure 14 above the Selection named Population gt 10 000 000 is highlighted Clicking on the radio button for a Selection will highlight that Selection and un highlight all other Selections in that Layer Clicking on the radio button marked Show All highlighting off will un highlight all selections When a Selection is highlighted features whose records are in that Selection will be drawn on the Map in a different way than features whose records are not Exactly how they will be drawn is determined by the the Highlight Mode Menu The different ways of highlighting Selections are e Color Selected Yellow Selected records features are drawn in yellow all other records are drawn normally e Color Selected Magenta Selected records features are drawn in magenta a light purple color all other records are drawn normally e Transparent Unselected Polygon layers only Un Selected records features are drawn with a transparent fill color selected records features are drawn normally This mode is only available for Polygon layers because Points Lines and Grids are completely invisible when their fill color is transparent e Dim Unselected Grid layers only Un Selected records grid cells are drawn with 60 higher transparency than selected records grid cells The color of the cells is not affe
71. the Unidata Program Center at the University Corporation for Atmospheric Research THREDDS is Free Software released under the LGPL license You can access the source code to the libraries here My World also uses the MapObjects library to connect to ArcIMS servers MapObjects copyright 2005 Environmental Systems Research Institute Inc All rights reserved My World also uses several libraries from FreeHEP an Free Software library for High Energy Physics developed by contributors from CERN SLAC and UC Santa Cruz FreeHEP is released under the LGPL license My World uses a slightly modified version of one the libraries The source code for both My World s version of that library and the original version can be found here For the complete FreeHEP source code or more information on FreeHEP visit the project s home page A small portion of My World the handler for file URL s is based on code from the Geronimo J2EE Container from the Apache Software Foundation For more information on Geronimo see geronimo apache org OpenMap is a trademark of BBN Technologies a part of Verizon JavaBeans is a trademark of Sun Microsystems Inc ESRI and the ESRI globe logo are trademarks registered trademarks or service marks of ESRI in the United States the European Community and certain other jurisdictions Data Some of the data files in the My World distribution contain proprietary and confidential property of Environmental Systems Resear
72. they are also provided here as separate fields for the sake of clarity Clicking on the Reset To Defaults button will re set these values to the actual minimum and maximum values of the field s data The Classify By menu determines how the range of values of the selected field are divided into Intervals to which colors or symbol shapes or other aspects of appearance are assigned For more information on Classification see the Glossary entries for Equal Interval Natural Breaks and Quantiles Choosing Appearance by a Categorical Field Compared to the controls for choosing an aspect of Layer Appearance based on a Numeric value the controls for using a Categorical value are quite simple as you can see in figure 9 below 11 Layer Name Vorld Cities Shape Size Color Category List Choose Color by Country v Colorscheme fifi URUNU Random X Tr ansparency o je Afghanistan Albania Algeria h Angola ER Argentina Argentina E Armenia Armenia Merge Selected Categories Split Selected Category Figure 9 Choosing an aspect of appearance Color using a Categorical Attribute The Colorscheme and Transparency controls do the same thing for Categorical fields as for Numeric fields Below them is a table of Categories Each category consists of a Color or Shape Size etc depending on the selected Aspect a Name and a set of Values You can change the color of
73. ursor Location 58 7813 E ae Projection miser Cylinarioai Seale 4 177 497 613 Figure 1 Parts of the My World window in Construct Mode In Construct Mode there are four parts to the My World window At the top of the window are the tabs used to select the mode Each mode is used for interacting with the map in a different way Construct mode is used for adding new Layers to the Layer List to construct a Map Below the Mode tabs on the left edge of the window is the Data Library The Data Library is a collection of all of the Layer and Project files My World was able to find on your computer when it started up These files are organized into Libraries and you can select which Library is displayed using the Library menu To the right of the Library menu is the Import Layer From File button which you can use to open a Layer data file that wasn t found by My World s automatic search You can drag data files and projects from the Data Library into the Layer List to add them to the Map To the right of the Data Library is the Layer List As its name suggests the Layer List displays a list of Layers currently displayed in the Map The Layer List also has four Layer Buttons for operating on the active Layer in the Layer List To the right of the Layer List is the Map which is where Layers are displayed The Map Tools determine what action My World performs when you click on the Map And The Zoom Controls allow you to change the scale and l
74. ution or boundary you must use the Make Grid By Resampling An Existing Grid analysis tool 20 o Ci Make Lines Polygons from Grid By Selection Boundary Make Polygon from Grid by Selection Boundary creates a new Layer consisting of a single polygon which may contain more than one ring that contains all the area covered by a Selection from a Grid Layer Numeric data associated with those grid cells may be summed or averaged across that Selection Non numeric data is discarded i By Contour Lines Make Lines from Grid by Contour Lines creates a Layer of lines of equal value for a particular column of data in a Grid Layer Each line has its value associated with it in the new Layer s data table When an Analysis Operation is selected on the left hand side of the My World window in Analyze mode controls for the selected operation will appear on the right hand side Each operation has its own set of controls but all operation controls have some elements in common Those common elements are shown below in figure 13 21 Description of the Selected Operation Find records in World Cities based on the value of a E specified field Select Records from World Cities v hose Population v Is Less Than 23 620 000 Humans Controls for ane l the Selected v Is Greater Than or Equal to 10 000 000 Humans Analysis Operation Ee _ Make Selection a New Layer Records In World Cities Whose per
75. working internet connection is required to use the Online Help Data and Activity Centers 54 15 Glossary Colorscheme A Colorscheme is a system for assigning colors to an ordered series of categories The categories may be determined by ranges of numbers or by a set of text values Data Library A Data Library is a collection of data files usually data about a particular place or data to be used in a particular activity Equal Interval Equal Interval is a method for dividing a range of numeric values into categories It divides the values up in such a way that each category covers an equal amount of space along the range For example the range 0 to 100 would be divided equally into categories containing values from 0 to 25 25 to 50 50 to 75 and 75 to 100 Feature Used to refer to a Shape or a single cell of a Grid The Feature is what appears on the Map and each Feature is associated with a Record which holds all the other information about what that Feature represents Field A Field is a single aspect of each piece of data in a Layer For example a Layer of cities might contain one field for the name of the city one for the population of the city and another for whether or not the city is a capital Each piece of data consists of one or more Features on the Map which are associated with a Record and each Record in the Layer will contain a value for each of that Layer s Field s A Field corresponds to a column the

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