PositioNZ-PP - Land Information New Zealand
Contents
1. Job id XXXXXX Title Job summary page Submitted 2014 07 16 15 24 55 local time Status Completed successfully Input data Input RINEX file details File cast1540 140 Mark CAST Antenna TRM41249 00 NONE Receiver TRIMBLE NETRO ITRF2008 amp ITRF96 coordinates observation epoch NZGD2000 aligned with ITRF96 Antenna height 0 002 m Final Coordinates Epoch coordinates defined at th observation epoch decimal year 2014 42 ITRF2008 XYZ m 4816682 6441 319792 7439 4154972 9672 ITRF96 XYZ m 4816682 6381 319792 7207 4154972 9931 ITRF2008 lon lat hgt gt 176 201551017 40 909814192 17340995 ITRF96 lon lat hgt 176 201551288 40 909814413 1735707 continued on next page Land Information New Zealand Toit te whenua NZGD2000 coordinates nominal epoch 2000 0 Geographic coordinates NZGD2000 coordinates defined at nominal epoch 2000 0 Deformation model version 20140201 zJ 176 12 05 60006 E 40 54 35 34475 S 173 5705 NZGD2000 lon lat hgt DMS NZGD2000 lon lat hgt 176 201555573 40 909817987 173 5705 NZTM2000 east north 1869642 6012 5466317 67993 WAIRTM2000 east north 446702 5552 801568 89326 WANGTM2000 east north 460112 4273 725590 38392 NZVD2009 height 156 1677 XXXXTM2000 Meridional circuit NZVD2009 normal orthometric height projection coordinates DMS or decimal Heights are Longitudes and2. Antenna phase centre approx Antenna Reference Point ARP Antenna reference point ARP example on a Trimble Zephyr Geodetic antenna Horizontal Reference Point Vertical Reference Point Example of a vertical reference point on a mark from which antenna height is measured Land Information New Zealand Toit te whenua Results What type of coordinates are calculated and what are the job summary page contents e The results provided by PositioNZ PP on the job summary page include two blocks of coordinates Observation epoch coordinates and NZGD2000 coordinates at nominal epoch 2000 0 For example EXTRACT FROM JOB SUMMARY PAGE Epoch coordinates defined at the observation epoch decimal year 2011 34 ITRF2008 XYZ m gt 5011995 6446 149520 9862 3929003 1605 ITRF96 XYZ m gt 5011995 6407 149520 9671 3929003 1839 ITRF2008 lon lat hgt 178 291223308 38 268212775 229 3264 ITRF96 lon lat hgt gt 178 291223525 38 268212965 2293374 NZGD2000 coordinates defined at nominal epoch 2000 0 Deformation model version 20140201 NZGD2000 lon lat hgt DMS 178 17 28 40220 F 38 16 05 57310 S 229 3374 NZGD2000 lon lat hgt gt 178 291222833 38 268214749 229 3374 NZTM2000 east north gt 2063012 3832 5751162 8874 POVETM2000 east north 435500 6618 839465 4184 NZVD2009 height i 206 8333 e The observation epoch coordinates reflect the position of the mark at that point in time These are expres
3. q a unit weight around 1 The following reference stations have been selected to process this mark The horizontal and vertical fit represent how well the calculated baselines from the supplied mark to these reference stations fit their ITRF2008 coordinates in the minimum constraints solution Station distance km i Fit of the minimum constraints solution DNVK 67 9 indication of how well MAST 54 6 your mark fits in with the WGTN 125 9 reference stations how good the result is Download Results Files Zip folder to download All files compiled into a single zip file all PositioNZ PP result Summary of RINEX file processing files at once Information about these results SINEX file pf final coordinate calculatign for CAST casti540 SINEX file of minimum constraints caldulation for CAST casti540 140 information from RINEX fileg in the calculation for CAST casti540 140 Summar Readme txt file coordinates csv nzgd2000 csv includes more coordinates at coordinates information about observation epoch nominal epoch the results see content 2000 see content descriptions here descriptions here Land Information New Zealand Toit te whenua How long can I expect to wait for the coordinate results e Provided the required orbit information is available PositioNZ PP will typically send results within 10 minutes This may be longer if the service is bu
4. DDD is the GPS day of year e Sis the session number e YY is the last two digits of the observation year and O is part of the observation file extension Submitted files must be in the RINEX Receiver INdependent EXchange v2 11 format This is the internationally agreed standard format for the exchange of GPS data from various receiver types The RINEX v2 11 specification is available here Only data observed within New Zealand extents and after 1 Jan 2000 is currently accepted by the PositioNZ PP service Antenna height requirements please see full details here Antenna type requirements please see full details here Only the RINEX observation files are required whether compressed or not there is no need for any other supplementary files such as navigation files PositioNZ PP obtains high accuracy orbit products for processing automatically RINEX data observed in static mode is required PositioNZ PP does not process kinematic or real time data Dual frequency L1 and L2 GPS RINEX observation files with both code and carrier phase data are required Single frequency data cannot be processed Other constellations such as GLONASS GALILEO and Beidou are not used by PositioNZ PP RINEX files can include observations to these systems but only the GPS data will be used during processing Land Information New Zealand Toit te whenua How long must the observation session be in the RINEX file for PositioNZ PP processin
5. Toit te whenua e Since the NZGD2000 coordinates nominal epoch 2000 0 that you receive from PositioNZ PP have already had the deformation model applied be careful not to apply it again in other software which accounts for the New Zealand deformation model such as the LINZ Survey Network Adjustment Package SNAP e The meridional circuit projection abbreviations are available here The following coordinates are provided by PositioNZ PP at observation epoch when the RINEX data was collected e ITRF2008 XYZ m These are geocentric cartesian coordinates X Y Z in metres in the International Terrestrial Reference Frame 2008 e ITRF96 XYZ m These are geocentric cartesian coordinates X Y Z in metres in the International Terrestrial Reference Frame 1996 This is the ITRF that NZGD2000 is aligned with as it was the latest available when NZGD2000 was implemented Please note This is the NZGD2000 observation epoch coordinate NOT reference epoch coordinate e ITRF2008 lon lat hgt These are geographic coordinates geodetic coordinates with longitude and latitude in decimal degrees and ellipsoidal height in metres They are in the latest International Terrestrial Reference Frame 2008 e ITRF96 lon lat hgt These are geographic coordinates geodetic coordinates with longitude and latitude in decimal degrees and ellipsoidal height in metres They are in the International Terrestrial Reference Frame 1996 e The d
6. aligned with Cartesian coordinate Y metres in the International itrf96_Y Terrestrial Reference Frame 1996 the realisation that NZGD2000 is aligned with Cartesian coordinate Z metres in the International itrf96_Z Terrestrial Reference Frame 1996 the realisation that NZGD2000 is aligned with Standard error apriori not scaled by SEUW in the east direction metres May be multiplied by eg 1 96 to obtain the error at a the 95 confidence level May multiply by the SEUW value to obtain the aposteriori standard error aaa Standard error apriori not scaled by SEUW in the north direction metres Standard error apriori not scaled by SEUW in the err_u 2 a up direction metres corr_en Correlation of the east and north errors corr_eu Correlation of the east and up errors corr_nu Correlation of the north and up errors The standard error of unit weight from the final adjustment The aposteriori SEUW is typically very optimistic A more realistic measure of the accuracy seuw can be taken from the residuals in the reference station coordinates in the minimum constraints solution in the job summary though this still does not account for plumbing or heighting errors Result file NZGD2000 csv At nominal epoch 2000 0 Column name Description Full station name that user supplied or extracted mank from RINEX file datafile RINEX fil
7. per mark gives its own individual coordinate solution in the result files e Coordinate result files are able to be easily downloaded in multiple formats after clicking the URL link contained in the results e mail that is automatically sent out when PositoNZ PP finishes processing e If automatic PositioNZ PP processing is not successful for your input RINEX files LINZ staff aim to contact you within 5 working days about your job After taking a closer look at the files it may be possible to make some changes to them so that PositioNZ PP can process them successfully What software is used for GPS data post processing in PositioNZ PP e Bernese v5 2 GNSS post processing software which is high precision specialised positioning software e Software developed by Astronomical Institute University of Bern AIUB Switzerland e Bernese software information can be found here e Other software used Teqc from UNAVCO which you can download here e See the RINEX file problems section for some information about Teqc for manipulating RINEX files so that the format is acceptable for PositioNZ PP How are NZGD2000 coordinates calculated by PositioNZ PP GPS post processing is performed using the Bernese v5 2 GNSS processing software The coordinates are first calculated in the IGb08 reference frame which is a realisation of the International Terrestrial Reference Frame 2008 ITRF 2008 calculated by the International GNSS Service These c
8. to the directory where your RINEX file is located through the command line window and then run this Teqc quality control command The output may include information about invalid lines in the RINEX file More Teqc tutorial material is available here An example of a RINEX observation file GISB1440 130 is shown below The RINEX v2 11 specification is available here The RINEX format is based on columns data must be in exactly the right column to be interpreted properly The order of header records after the first record is not important Individual header records are identified by the text in columns 60 to 80 number of characters along the row which must be exactly as shown below Lema RINEX v2 11 Receiver type ea ee 5 Agency Name OBSERVER AGENCY 6 5016K66900 TRIMBLE NETR9 4 46 REC TYPE VERS 7 1441027609 TRMS5971 00 NONE ANT TYPE 4985376 1440 184022 2097 3960830 2020 1 1 a WAVELENGTH FACT L1 2 11 Si Pi c2 L2 P2 TYPES OF S6BSERV 12 INTERVAL 21 sampling height of antenna coordinates 22 interval reference point typical NZ values 23 length ARP above needed for A 30 seconds vertical reference processing by me point of mark PositioNZ PP 27 9356596 982 7 45 200 21454337 672 28 24391517 078 130295047 791 37 100 24391516 219 29 101340670 808 5 34 500 24391525 211 8 25125801 070 132037055 379 32 600 31 102885974 54342 15 600 25125805 906 2 22729847 398 119446084 338 47 600 33 93074975 30045 33 800
9. use the PositioNZ PP service to coordinate your own control e Enables the user to make high precision connections into the geodetic network as the PositioNZ PP service utilises the PositioNZ network of continuously operating GNSS reference stations Order 0 e Saves time for the user through reduced or no need for additional user setup base stations e Coordinates are provided in the official geodetic datum NZGD2000 at nominal epoch 2000 0 Solutions are also available in the appropriate meridional circuit projection systems for each particular mark location e The latest NZ deformation model is automatically applied to calculate the coordinates at nominal epoch 2000 0 which is the official epoch for NZGD2000 This enables consistent dataset integration in Landonline and many other spatial databases e Coordinate solutions in the latest International Terrestrial Reference Frame ITRF2008 at observation epoch are provided as well as ITRF96 with which NZGD2000 is aligned e Ellipsoidal heights are provided as well as normal orthometric heights in the official national vertical datum NZVD2009 Land Information New Zealand Toit te whenua e Sophisticated Bernese v5 2 GNSS processing software is used within PositioNZ PP Processing takes advantage of the most precise orbit information available and the GPS RINEX files are processed using ITRF2008 positions of the PositioNZ reference stations e Each RINEX file submitted
10. 22729850 418 4 23146731 328 121636907 236 45 300 35 94781991 50744 25 800 23146735 285 36 19758610 172 105658188 859 44 600 19758610 836 7 82178667 720 8 48 800 19758616 074 8 20527249 414 107871540 841 50 500 39 84055808 67547 43 100 20527250 852 4 21701043 203 114039737 439 48 600 41 88862122 66746 37 500 21701045 520 42 22275461 227 119200481 852 43 800 men n 43 92711546 926 5 34 800 22275465 488 RUSK ae specification Z http iqscb jpl nasa gov igscb data format r 44 21710472 180 114089286 789 48 100 inex211 txt 45 88900798 30046 36 700 21710475 961 Normal text file length 5212863 lines 102702 Ln 80 Col 40 Sel 0 0 teqce Be 50223M001 Data OBSERVATION DATA 0 0000 0 aan Mark name 0 0000 0 0000000 R21G25R1i9RO6RO5 51 300 Antenna height M MIXED 20134525 03 04 28UTCPGM RUN BY DATE GPS Land Information New Zealand Toit te whenua RINEX VERSION TYPE MARKER NAME MARKER NUMBER APPROX POSITION XYZ ANTENNA DELTA H E N Antenna type recognised by IGS amp LEAP SECONDS TIME OF FIRST OBS END OF HEADER conform to naming Approx XYZ standard Stations located on the Chatham Islands have values missing show zeros for NZTM coordinates e The geodetic coordinates of these stations are outside of the valid range for calculating NZTM2000 coordinates The coordinates could not be calculated in that projection system Marks on the Chath
11. NEX data that needs to be changed The items that failed the validation checks and need to be changed will be highlighted in red See the relevant sections on the field contents at Step 3 station name antenna type and antenna height Invalid observation frequency XX Must divide into 30 The data sampling rate in the RINEX file should be 30 seconds or be a rate such as 5 or 10 seconds so that it can be converted into a 30 sampling interval Data is not dual frequency RINEX data L1 amp L2 data is needed both code and phase For more information see the data requirements section What should I do if the RINEX file fails to process in PositioNZ PP First check the common errors section to see if that helps to solve the issue RINEX navigation files are not needed for PositioNZ PP processing If your file fails to process in PositioNZ PP you may try running the file through the Teqc software This is command line based software used for RINEX file manipulation Teqc stands for Translation Editing and Quality Check This software is freely available for download from the UNAVCO website and a tutorial PDF is also available from this site Teqc can identify problems with your RINEX file such as RINEX header formatting which can be altered before trying to process the file in PositioNZ PP again A useful Teqc command is teqc qcq FILENAME yyO the RINEX file must first be unzipped and uncompressed First navigate
12. NZ if required Step 2 Select GPS RINEX files Click Add Files at the bottom of the RINEX upload box Select the RINEX files you want to upload for processing Up to ten RINEX files can be submitted per processing job If a RINEX file has been added in error click the red circle button to remove it Click the Next button to start the file upload The accepted RINEX file extensions for PositioNZ PP are Extension Description yyO RINEX observation file yy indicates the last two digits of the year when the data was observed yyO Z RINEX observation file unix compressed yyD RINEX observation file compressed using Hatanaka compression LyyD Z RINEX observation file unix compressed and Hatanaka compressed gz gzip compressed file Zip zipped RINEX file RINEX files located within a zipped folder also accepted up to ten RINEX files per job once folder is unzipped An example of a RINEX file is available here Step 3 Edit RINEX file metadata e Information extracted from the RINEX header will be shown on this page for each RINEX file underneath each input field e Correct any fields that failed a validation check or e edit any that are incorrect and you have alternative values for eg if you know the RINEX header information is incorrect and you have the correct values e Take note of any error messages and see whether all the files you intended to upload w
13. PositioNZ PP GPS post processing service Help information PositioNZ PP Quick Start Step by Step Step 1 Setup job Step 2 Select GPS RINEX files Step 3 Edit RINEX file metadata Step 4 Confirm job details and submit for processing Job confirmation page Confirmation e mail Land Information New Zealand Toit te whenua Results e mail coordinate solutions and downloading result files Introduction to PositioNZ PP What service is provided Benefits of using this service GPS processing software used Calculation of NZGD2000 coordinates Data requirements General data input requirements RINEX file requirements Observation length needed Common errors encountered RINEX file fails to process Orbit and Antenna information Ultra Rapid Rapid and Final Orbits Antenna type information Antenna height information Results Type of coordinates calculated Type of heights outputted Contents of csv result files Job summary page example Questions about the results Glossary amp contact details Glossary Contact LINZ Land Information New Zealand Toit te whenua PositioNZ PP Step by Step Click Cancel at any step to discard the current job and get a fresh PositioNZ PP form to start again Step 1 Setup job e Enter your e mail address processing results will be sent here e Enter the processing job title will be used in any future correspondence with LI
14. am Islands will have results provided in the Chatham Islands Transverse Mercator projection in a future release of PositioNZ PP In the meantime the LINZ coordinate conversion service can be used Land Information New Zealand Toit te whenua Orbit and Antenna information What is the difference between Ultra Rapid Rapid and Final orbits Ultra Rapid Orbits These are computed partly from observations and partly from predicted orbits These are the lowest quality orbits that are used by PositioNZ PP broadcast orbits will not be used They are available between 3 to 9 hours after the end of an observation session and are IGS orbit products Rapid Orbits These are available between 17 41 hours after the observation time The quality of these orbits is better than the Ultra Rapid orbits but not the highest quality that is available Itis recommended to use at least Rapid orbits where Final orbits are unavailable as they will generally be accurate enough for survey work Final Orbits These are available approximately 12 18 days after the observation day and are carefully post processed to ensure aspects such as problematic satellites are removed and other orbit issues are modeled These are the best quality orbits that are available but you may have to wait some time for them Orbit latencies are available from the IGS orbit product website There is not much difference in effect between Rapid and Final orbit process
15. by the International GNSS Service IGS or conform to the naming convention click here for further information on antenna types Usually the correct antenna type is available in this list but the official name is different to what is in the RINEX file Choose the appropriate antenna from the drop down list e Not observed in New Zealand from the RINEX file headers Currently only stations in New Zealand are accepted The coordinates in the RINEX file header indicate that the location of your mark is not in New Zealand PositioNZ PP only processes New Zealand data as it uses the PositioNZ network of continuously operating GNSS stations as reference stations See the data file requirements here e Observation period is less than minimum 1 hour The RINEX file observation session is too short The session length must be between 1 hour and 48 hours e Observation period is greater than maximum 2 days Land Information New Zealand Toit te whenua The RINEX file observation session is too long The session length must be between 1 hour and 48 hours XXXXDDDS YYO is already loaded in the job Duplicate filenames are not accepted in the same processing job Rename files so that they are unique or process the files in separate jobs Too many files specified for job Maximum is 10 The first ten files you uploaded were attached for processing and the rest were discarded Process the other files in a separate job There are X items in the RI
16. ccount daylight saving time and should not be confused with Greenwich Mean Time GMT Contact Details How can I contact LINZ about my processing job or submit feedback e Ifyou are experiencing problems and need some help or would like to submit feedback please e mail crm_geodetic linz govt nz with PositioNZ PP feedback or PositioNZ PP issue in the subject line Alternatively call LINZ customer support 0800 665 463
17. cessed with the orbit quality that was chosen Confirmation e mail This contains the URL link that you can click on to check the progress of your job Normally job processing takes around ten minutes but it could take longer if the PositioNZ PP service is busy with several jobs It will also depend on how many RINEX files you have submitted in a single processing job Clicking on the URL link brings you to a page that shows one of these three different PositioNZ PP states depending on the processing status e your job has not yet been processed e your job is on hold until the desired orbit quality data becomes available note the expected availability time your job has finished processing and you may download the result files from the job summary page Land Information New Zealand Toit te whenua Results e mail coordinate solutions and downloading result files e The second and final e mail will be sent containing the job results summary once processing by PositioNZ PP is complete Click the URL link in the e mail to go to the job summary page where you can download all of the result files e The result files come in a variety of formats such as csv txt SINEX and KML that can be downloaded individually There is also the option of downloading all of the job result files in a single zip folder if you would like to store all of the files together e A readme file is also available to download containing extra inf
18. e name RINEX file date of observation UTC date and time date of the beginning of the observation session Not the coordinate epoch date Coordinate system column Includes NZGD2000 DMS degrees minutes seconds New Zealand Geodetic Datum 2000 NZGD2000 decimal degrees New Zealand Geodetic Datum 2000 coordsys NZTM2000 New Zealand Transverse Mercator projection XXXXTM2000 Individual Meridional Circuit projection coordinates Coordinates may be available in more than one circuit projection depending on mark location Geographic coordinates Longitude or Easting east depending on the coordinate system or projection Negative for south positive for north Geographic coordinates Latitude or Northing north depending on the coordinate system or projection Negative for west positive for east ell_height NZGD2000 ellipsoidal height metres 3 Normal orthometric height metres New Zealand be AMR neni Vertical Datum 2009 You may also convert the coordinate results to other coordinate systems by using the LINZ online coordinate conversion service Land Information New Zealand Toit te whenua Job Summary Page Example LINZ PositioNZ PP Job Summary Note Land Information New Zealand LINZ does not provide a warranty of any kind with respect to the accuracy of these results In no event shall LINZ be liable for loss of any kind whatsoever with respect to the use of these results
19. eformation model has not been applied to observation epoch coordinates The following NZGD2000 coordinates are provided by PositioNZ PP at nominal epoch 2000 0 e The latest national deformation model is used this is used to propagate the coordinates from the observation epoch to nominal epoch 2000 0 This model contains relevant patches that needed to be taken into account after earthquake events e NZGD2000 lon lat hgt DMS These are geographic coordinates geodetic coordinates with longitude and latitude in degrees minutes seconds and ellipsoidal height in metres Coordinates are at nominal epoch 2000 0 the reference epoch for NZGD2000 e NZGD2000 lon lat hgt Geographic coordinates geodetic coordinates latitudes and longitudes in decimal degrees and ellipsoidal heights in metres Coordinates at nominal epoch 2000 0 the reference epoch for NZGD2000 e NZTM2000 east north New Zealand Transverse Mercator Projection coordinates at nominal epoch 2000 0 Easting and Northing in metres e XXXXTM2000 east north Transverse Mercator Meridional Circuit projection at nominal epoch 2000 0 Coordinates in more than one meridional circuit may be included depending on the location of the mark A full list of meridional circuit projection abbreviations are available here Land Information New Zealand Toit te whenua e NZVD2009 height The normal orthometric height in metres in the official New Zealand Vertical Datum 2009 This h
20. eight is relative to the NZGeoid2009 quasigeoid reference surface For more information please see the NZVD2009 page What heights are provided in the results e Two different heights are provided for users the NZGD2000 ellipsoidal height and the NZVD2009 normal orthometric height both in metres These are contained in the NZGD2000 csv file e The reference surface for NZGD2000 is the GRS80 ellipsoid See the NZGD2000 page for further information e The reference surface for NZVD2009 is NZGeoid2009 See the NZVD2009 page for further information on the official vertical datum Contents of csv result files Further information is also contained in the readme txt file available for download from the job summary page Result file Coordinates csv At observation epoch Column name Description mark Full station name that user supplied or extracted from RINEX file datafile RINEX file name RINEX file date of observation UTC date amp time of date alee the beginning of the observation session r Cartesian coordinate X metres in the International Hues Terrestrial Reference Frame 2008 Cartesian coordinate Y metres in the International aoe Terrestrial Reference Frame 2008 itrf2008_Z Cartesian coordinate Z metres in the International Terrestrial Reference Frame 2008 Cartesian coordinate X metres in the International itrf96_X Terrestrial Reference Frame 1996 the realisation that NZGD2000 is
21. ere successfully attached Generally RINEX files created by GNSS software will be successfully read by PositioNZ PP but you may need to refer to the common error section for help_if your files are not accepted Land Information New Zealand Toit te whenua Station name field A simple uppercase four character code is required for internal processing in the GPS processing software used within PositioNZ PP Longer names will be truncated for this purpose The station name should contain just alphanumeric characters with no spaces Otherwise spaces will be removed and alphanumeric characters will be taken from the RINEX filename to create the four character code In the KML and csv result files the full station name entered or extracted from the RINEX file will be shown even if it has spaces Antenna radome type field If you get a message Antenna radome type not recognised select an alternative then use the drop down list to choose an officially recognised antenna type that can be processed by PositioNZ PP These have known antenna offsets and conform to International GNSS Service IGS naming conventions Using the correct antenna type is important as the coordinate solution will be affected especially in the vertical component In the drop down list you will see the antenna types grouped into commonly used antennas and antennas with and without radomes PositioNZ PP records antenna radome types that you have u
22. formation New Zealand Toit te whenua What are the requirements for the antenna type field The antenna type field can be updated by selecting a different antenna from the drop down list If there is a message at Step 3 that the antenna type extracted from the RINEX header is not a recognised type then the user must select an IGS recognised antenna type for use in PositioNZ PP processing For a list of accepted antennas please click here It may also be helpful to see the physical antenna dimensions available here The antenna information main page of the US National Geodetic Survey NGS is available here To view antenna offsets information please see the NGS antenna calibration page Only antennas calibrated for dual frequency data can be selected The calculated station height may be incorrect if the wrong antenna type is used Selecting the right antenna is important as corrections are applied depending on the antenna type In particular the offset between the Antenna Reference Point ARP and the electronic centre of the antenna varies This mainly affects the vertical component as using the wrong antenna type could change the calculated ellipsoidal height by several centimetres but depending on the antenna could also affect the horizontal component too In order for the software to apply this model or offset for each antenna type it must be identified by a specific name or code known by the International GNSS Serv
23. g What must the data sampling rate be e A data sampling rate of 30 seconds is used in PositioNZ PP Data sampled at higher rates eg 5 seconds can be submitted but the extra data will be discarded e Ifthe data sampling rate observation interval is less than 30 seconds and is a factor of 30 it will be converted into 30 second data for processing eg 1 5 10 15 seconds If the observation interval is greater than 30 seconds it will not be able to be processed e The shortest observation session length accepted in an individual RINEX file is one hour of 30 second data and the longest session length is 48 hours of 30 second data e Longer observation data spans are likely to provide more accurate solutions If possible it is recommended to have approximately 4 hours observation time If you have observation lengths of 12 to 24 hours in the RINEX file this could provide more accuracy What are the oldest files that can be uploaded e RINEX data observed from 1 Jan 2000 or later are accepted for processing Common errors encountered PositioNZ PP Step 3 e Nota valid RINEX file line XX Your RINEX file failed validation checks please make sure the RINEX version is 2 11 and check the contents of the file at the line number to see why it might have failed More information on RINEX files is available here e Antenna radome XXXXXXXX not recognized select an alternative The antenna type in the RINEX file is not recognised
24. ice IGS What are the requirements for the antenna height field The antenna height is the height of the Antenna Reference Point ARP above the vertical reference point of the mark The antenna height must be between 0 and 100 metres for PositioNZ PP processing The antenna height field is automatically populated and the value is extracted from the RINEX file header You are able to update the antenna type and height fields with alternative values when submitting RINEX files to PositioNZ PP At Step 4 fields which do not match the RINEX file are starred so that users are warned that changes have been made to the input data before clicking the Submit button To obtain accurate height results for your mark from PositioNZ PP it is important to ensure that the antenna height is correctly measured between the defined reference point on the antenna and the vertical reference point of the ground mark iy Land Information Toit te whenua e See below for diagrams showing examples of the antenna reference point on a Trimble Zephyr Geodetic antenna and the vertical reference point of a mark A Antenna height for PositioNZ PP Top of_user s mark vertical reference point Example of an antenna height for PositioNZ PP processing distance between the vertical reference point of the user s mark and the Antenna Reference Point ARP Land Information New Zealand Toit te whenua Bottom of Notch BoN
25. ing in NZ as the continuously operating PositioNZ stations are relatively close together and the baseline error differences between the orbit qualities are not that significant PositioNZ PP will use the best available orbit information for each RINEX file at the time the job is submitted for processing and will only offer a choice of orbit quality to users if the Final orbits are not yet available for all of the files submitted If these orbits are not available immediately then a drop down list will appear at Step 4 where users can choose which orbit quality they would like to use depending on the expected time that they will become available Please see the above guide on the availability timeframes before choosing the orbit quality For example if there is a mixture of RINEX file ages eg some are two months old some three days old some a few hours old and you select Rapid orbits as the minimum quality orbit you are willing to accept then PositioNZ PP will calculate some files using Rapid quality orbits and some with Final quality orbits depending which orbits are available for each RINEX file Why do we have to wait for some orbit data The orbit data required for precise positioning in PositioNZ PP is only available from external international agency websites LINZ uses the International GNSS Service IGS orbit products To be able to calculate precise coordinate results we must wait for accurate satellite orbits Land In
26. latitudes in degrees minutes and seconds degrees eastings northings and heights are in metres ellipsoidal except for the NZVDO9 height Covariance matrix Diagonal values are XYZ covariance matrix m 2 0 000000128 0 000000007 0 000000100 0 000000007 0 000000006 0 000000006 0 000000100 0 000000006 0 000000094 variances standard deviation squared Covariance matrix contents X coordinate Y coordinate Z coordinate x o o XY o XZ coordinate AE of X covariance covariance between X amp Y between X amp Z Y o XY o2 o YZ coordinate sever nee peeves of Y Covariance between X amp Y between Y amp Z z o XZ o YZ o2 coordinate cavaridnce covariance Garaio of Z between X amp Z between Y amp Z Multiply these ENU errors by SEUW to get aposteriori errors Apriori ENU errors mm from Bernese from Bernese topocentric ENU errors mm covariances and standard errors are likely to be optimistic as GNSS for example Note processing does not account for all potential sources of error plumbing errors All errors are apriori values Land Information New Zealand Toit te whenua Processing summary for minimum constraints solution Session 2014 06 03 00 00 0 UTC to 2014 06 03 23 59 3 UTC DOF 9541 Degrees of freedom lt seuW 1 2543 gt Standard error of unit weight Aposteriori SEUW standard error of Reference stations
27. nates do not stay constant as the points we measure are continually changing their position Observation epoch coordinates Coordinates at the specific point in time when the RINEX data was observed The coordinates have a timestamp of the observation date Radome Radar dome a protective cover for the GPS antenna which still allows GPS signals through An example of a radome is shown in the image below GPS antenna with radome Reference epoch coordinates Coordinates at a particular agreed reference time to propagate coordinates observed at various times back to the common epoch In the case of New Zealand s official geodetic datum NZGD2000 the reference epoch is nominally 1 Jan 2000 These mark positions are nominally as at 1 Jan 2000 except that they include deformation due to some earthquakes that have happened since then Land Information New Zealand Toit te whenua Generally the NZGD2000 reference epoch coordinates of a mark do not change other than due to resurvey or local tectonic events such as earthquakes RINEX Receiver INdependent EXchange Format Further information can be found here SINEX Solution INdependent EXchange Format Results can be downloaded from the job summary page in this format SINEX version 2 01 is used and the specification can be found here UTC time Coordinated Universal Time UTC time is used in the GPS RINEX files The day of UTC starts at midnight 00 00 It does not take into a
28. on in the pop up box such as the RINEX file name If it is a PositioNZ reference station it is also possible to click More Info and this will take you straight to the mark details page of the geodetic database e The KML file will contain the full station name that the user supplied which may be different to the four character mark code used in the internal processing and given in some of the result files Why are there values missing inside the KML and CSV files on the job summary page e If some files process and some are on hold then values will be missing for the on hold stations in every result file Wait for all stations to process and then come back to the job summary page all the result files will then be fully populated Land Information New Zealand Toit te whenua Why are decimal years used for observation epoch results For coordinate results at observation epoch in the ITRF and NZGD2000 datum the epoch is given in decimal years Decimal years are used because it is the easiest format for propagating coordinates between epochs when applying deformation models Example ITRF2008 coordinate at observation epoch 2011 38 This is epoch 2011 with Day of Year of 0 38 365 DOY 139 Decimal years help to remove problems if a year is 366 days long for example Can you tell me more about the SEUW The standard error of unit weight SEUW should be around 1 if the apriori estimated error is consistent with
29. oordinates are at the observation epoch of the RINEX file The ITRF2008 observation epoch coordinates are then transformed into ITRF96 coordinates the datum that NZGD2000 is aligned with also at the observation epoch of the RINEX file Using the latest NZ deformation model these coordinates are propagated back to give NZGD2000 coordinates at nominal epoch 2000 0 This is the official reference epoch for NZGD2000 for example all coordinates in the Geodetic Database are published at nominal epoch 2000 0 Land Information New Zealand Toit te whenua Data requirements What are the general requirements for PositioNZ PP including RINEX files A valid e mail address is required so that coordinate results are able to be received automatically Up to 10 RINEX files are able to be submitted in a single processing job More than one RINEX file can be submitted for the same mark per processing job even if it was observed on the same day as long as the file names are different One coordinate solution is obtained per RINEX file Each RINEX file included in the same processing job must have a different file name The station name field is recommended to have a simple four character alphanumeric uppercase code with no spaces Longer names will be truncated so that internal processing can occur The IGS file naming convention is recommended but is not compulsory eg XXXXDDDS YYO where e XXXX is the four character station code e
30. ormation about the results Land Information New Zealand Toit te whenua Introduction What service does PositioNZ PP provide The PositioNZ PP automated GPS post processing service made available by Land Information New Zealand provides users with accurate positioning solutions in official NZGD2000 coordinates and International Terrestrial Reference Frame ITRF coordinates The service is free and simple to use customers provide their e mail address and upload their GPS RINEX files for observed marks for which they would like a coordinate solution PositioNZ PP then processes each input RINEX file individually using data from selected reference stations from the national network of PositioNZ continuously operating GNSS stations The data is processed using the specialised Bernese v5 2 GNSS processing software Results are sent by e mail which also contains a link to an online results page from which additional result files can be downloaded Some of the benefits of using PositioNZ PP include e Accurate survey grade coordinate solutions are obtained without the need for users to have their own specialised GNSS processing software The general accuracy is within a few centimetres e The service is free of charge and straightforward to use e Itis a 24 hour 7 days a week automated online service excluding planned and unexpected outages and staff assistance e If there are no control marks in the area of survey you may
31. sed in terms of ITRF2008 and ITRF96 realisations of the International Terrestrial Reference System ITRS Note that technically ITRF2008 and ITRF96 do not define an ellipsoid the GRS80 ellipsoid has been used to convert the X Y Z coordinates to latitude longitude and ellipsoidal height e NZGD2000 is aligned with ITRF96 However NZGD2000 coordinates are generally transformed back to nominal epoch 2000 0 by applying the National Deformation model This removes the effect of tectonic deformation including some earthquake events since 2000 0 so that coordinates observed at different times remain in terms with each other NZ is moving on average around 5 cm per year along the boundary between the Australian and Pacific plates For example the difference in coordinates between the years 2000 and 2014 may be as much as 70 cm e LINZ recommends that accurate coordinate calculations are performed in ITRF2008 or ITRF96 with coordinates being converted back to NZGD2000 for storage and mapping This is the approach used by PositioNZ PP which uses ITRF2008 The NZGD2000 coordinates at nominal epoch 2000 0 can be used for local applications such as most cadastral surveying e The meridional circuit projection coordinates available for each mark are also in the results section and users may choose which ones to use These coordinates are consistent with those published in Landonline and the Geodetic Database Land Information New Zealand
32. sed recently on your computer to make it easy to reuse the same settings Antenna height field Input values must be between 0 and 100 metres The antenna height is the height of the Antenna Reference Point ARP above the vertical reference point of the mark Please refer to the user manual of your GPS equipment for the location of the ARP or the diagrams supplied by the IGS available here For further information on antenna heights and diagrams click here Remove RINEX files Tick the Remove file from job boxes for each file and click Next The file will be deleted from the job You may also click Back to go to Step 2 and add more files to the job Step 4 Confirm job details and submit for processing Confirm that the RINEX file details that you are about to submit are correct In particular please confirm that the e mail address and job title you entered are correct so that you can receive your results as expected Items marked with a star differ from the value contained within the RINEX file check that you intended to change these fields If any details are incorrect click the Back button to make amendments If your RINEX files are relatively new less than about 12 days old you may see a drop down box on the Step 4 page where you can make a selection for the minimum quality orbits that you would like to use for processing the job Land Information New Zealand Toit te whenua Posi
33. sy with several jobs e You may have to wait longer if you have requested to use better quality orbits and they are not yet available please note the expected availability time when making the selection No confirmation or results e mail has arrived e Resubmit your job taking care to ensure you have entered the correct e mail address at Step 1 When will LINZ get back to me if my job doesn t process as expected e We aim to contact you about your PositioNZ PP job within 5 working days e National Geodetic Office NGO staff are able to retrieve input RINEX files from jobs submitted for offline analysis of processing issues This may include manual processing using the Bernese GNSS processing software Why can t I view the text result files properly e The text result files are best opened with a viewer that uses monospace font eg Courier The alignment of the text and layout is better Can you tell me some more information about the KML result file e The KML file can be used to view the user station and the PositioNZ PP reference stations used in the processing This file can be read by a wide range of GIS Geographical Information System software as well as mapping software such as Google Earth e When opening a KML file in Google Earth it should automatically zoom in to the area of NZ where your marks are and you can also view the baselines from your processing job e Click on the mark node to see further informati
34. the actual error Often the SEUW is greater than 1 This is not necessarily a problem as the apriori estimated errors may have been unrealistic A better measure of the quality of the results for most purposes is the fit with the reference station coordinates Where do the RINEX files go after PositioNZ PP finishes processing The RINEX files used in processing jobs are kept by the system for 30 days in case a processing job fails and requires manual intervention and processing by LINZ staff Most files are then automatically deleted after 30 days Some RINEX files could be kept for future testing of the PositioNZ PP service Land Information New Zealand Toit te whenua Glossary Antenna height for PositioNZ PP The antenna height is the height of the Antenna Reference Point ARP above the vertical reference point of the mark The ARP isa defined point on a particular antenna and this is what the antenna height must be computed to Covariance a measure of how changes in one variable are associated with changes in a second variable The degree to which two variables are linearly associated Epoch this is a timestamp on the coordinates to ensure that we distinguish what point in time the position coordinates relate to Accurate recording of the epoch enables us to take into account the movement of the tectonic plates and other deformation such as that related to earthquakes These movements add up over time and the coordi
35. tioNZ PP uses GNSS satellite orbit data from the International GNSS Service IGS They are available in three iterations of progressively greater accuracy e Ultra Rapid orbits the earliest and least accurate Available within 9 hours after the observation time e Rapid orbits available within 41 hours after observation time e Final orbits the most accurate available within 18 days after observation time e For more information click here For most PositioNZ PP jobs Rapid orbits will provide good accuracy there may be little benefit waiting for Final orbits Processing with Rapid orbits should be enough for calculating coordinates at the survey quality level in NZ but if you would like to use orbits that have been fully post processed use the Final orbits If your orbit quality option is not yet available the expected date of availability is shown Your job can still be submitted and it will be on hold until the requested higher quality orbit products become available from IGS Click the Submit job for processing button to start PositioNZ PP processing Job confirmation page This page will confirm that your job was successfully submitted for PositioNZ PP processing A job number is assigned and you should receive a confirmation e mail shortly after submitting your job A second e mail with your results will arrive later once all the required data becomes available and when the coordinate solutions have been pro
Download Pdf Manuals
Related Search