Image-based Depression Storage Computation – IDS Tool
Contents
1. P2P Tools User s Manuc Version 1 50 Principal Investigator Dr Xuefeng Ch Postdoctoral Research Associate Dr Jianli 2 Graduate Research Assistants Jun Yang Noah Habtezion Yap June 17 2013 North Dakota State University Acknowledgement This material is based upon work supported by the National Science Foundation under Grant No EAR 0907588 The P2P Tool software is a part of the NSF funded project titled CAREER Microtopography Controlled Puddle filling to Puddle merging P2P Overland Flow Mechanism Discontinuity Variability and Hierarchy Any opinions findings and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation Contact Information for Limited Technical Support Dr Xuefeng Chu Department of Civil Engineering Dept 2470 North Dakota State University PO Box 6050 Fargo ND 58108 6050 Tel 701 231 9758 Fax 701 231 6185 E mail xuefeng chu ndsu edu This program is designed to calculate depression storage based on an experimental image The calculated depression storage can be the maximum depression storage MDS of a puddle or the depression storage at any puddle level Besides the image the original surface DEM without any water is required The DEM of a surface is often saved for a rectangular area However the picture of the surface taken during the experiment is poten2. MPA 285 188 cm2 Summary of Puddle Delineation E a a Level Area cm2 Storage cm3 1 184 500 49 266 E 2 198 563 56 144 3 285 188 96 459 i X 280 00 X 610 00 Y 80 00 Y 80 00 M Puddle Threshold Puddle Puddle Center 4 Specify the Locations of Points To manually specify any point in the depression users can check Add Point and then specify any points manually in the depressions by left 5 clicking on the image The selected cell indicates the water level elevation to which the depression is filled and the storage is computed Users can also delete or move the points by clicking on them with the left button of the mouse The points can be saved to a file by clicking the button Save Points By default the points added will be displayed in blue color Users can change the color by clicking on the blue color and selecting a different one In addition users can load the points by clicking the button Load Points 1f they have their desired locations in a file The file should include the total number of points followed by two columns x and y Control Move Image Be e Add Port Li A e Delete Point 4 Ca L o Move Point 6 I fe Point Color INS E i Point Number 6 e F Calculate and Draw By clicking the button Calculate and Draw the storage of each specified point will be shown immediately in the following textbox In addition a 2D grid view of puddle dist
3. ese parameters in the corresponding textbox or load a parameter file by clicking the button Correction File The data in the file is organized in four rows and four columns The first and second columns are the x and y locations of the four reference points in the distorted picture while the third and forth columns are the actual x and y locations Next click the button Calculation to calculate the relationship between the distorted and the actual pictures Coordinate Transit x y gt x 168 03 201 32 310 200 709 71 218 70 595 410 352 01 68 131 310 403 3 Storage Calculation After correcting the picture click Storage of Element to calculate the storage for each cell At this stage a new window will pop up to facilitate the calculation This window is a simplified puddle delineation PD program that is designed for the current purpose Follow the steps in the PD program by selecting the data type center based or node based and unit mm or m and click the button Load Data to load the DEM Next click the button Puddle Delineation to delineate the surface The summarized results will be shown immediately In addition the storage capacity for each cell will be calculated and saved in the file s_stor dat fad Puddle Delineation _ X 280 00 X 610 00 Y 470 00 Y 470 00 n Summarized Results a E mn Maximum Depression Storage MDS 96 459 cm3 Maximum Ponding Area
4. ributions with the specified points will be shown By changing the puddle elevation level users can visualize the distribution of puddles at the corresponding level Calculate ia Point No Storage cm3 O 5 921 1 13 405 Pa 1 297 3 0 195 dio o aL S S
5. tially distorted Thus image correction is needed to convert the distorted image of the surface into its actual image before calculating the depression storage For this purpose the puddle delineation PD program has been modified and applied 1 Windows Interface 2 Flowchart The following flowchart shows the steps for image based depression storage computation Import picture Lal Input four points in the original and real images I I I I I Image i correction i I i Correct image using the bilinear method 4 I I i Cell based storage calculation Calculate storage for each i cell Load from a file or add Add points by mouse points in the picture Boundary points of puddles Lc ec _ gt _ _ a p pz z z 2 2 2 n O D p O S p bi 5 O D j O co p is CL Q e O x oO N N f O 5 kwa R amp amp amp ____ amp _ amp _ RERE ee 3 Procedure The following steps are implemented to obtain the depression storage for any user defined points in puddles 1 Load picture Click the button Load Picture to select the picture to be processed The picture can be any format such as bmp jpg and jpeg 2 Processing Parameters To process the distorted picture users must select four reference points whose locations in both the distorted and actual picture should be known The users can either manually input th
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