3. Catchment Delineation Workflow - UniMasr€¦ · M. Elkordy Catchment Delineation Workflow Dec...
Transcript of 3. Catchment Delineation Workflow - UniMasr€¦ · M. Elkordy Catchment Delineation Workflow Dec...
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 1
Catchment Delineation Workflow
![Page 2: 3. Catchment Delineation Workflow - UniMasr€¦ · M. Elkordy Catchment Delineation Workflow Dec 2012 Slide 24 Preparation o t-Go ... in global mapper as a color relief box and an](https://reader031.fdocuments.in/reader031/viewer/2022022100/5bacde3b09d3f230528c2ace/html5/thumbnails/2.jpg)
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 2
Catchment Delineation Workflow• Given is a GPS point (Lat./Long.) for an outlet
location.• The outlet could be a proposed Dam site, a
storm water drainage culvert on a rural highway, or any other feature that is believed to be attacked by a stream.
• It is required to define the catchment that attacks the outlet point: Compute catchment parameters (area, slope, length,…etc)
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 3
Catchment Delineation Workflow• Steps:
1. Preparation• Preparing the DEM, Satellite images,.. etc
2. Delineating the Catchment• Initial Delineation inside WMS
3. Streams Verification• Correcting the streams as needed
4. Visualizing the Catchment
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 4
Catchment Delineation Workflow• Software Needed:
– Global Mapper– WMS– Google Satellite Maps Downloader– Google Earth
Latitude 21.498059° N
Longitude 41.601192° E
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 5
Step1: Preparation
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 6
Preparation• Software Needed:
– Global Mapper– WMS– Google Satellite Maps Downloader– Google Earth
Latitude 21.498059° N
Longitude 41.601192° E
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 7
Preparation- Open Google Earth. (Make sure that you use the latest version)
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 8
Preparation- Now add a Placemark. Place it Anywhere.
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 9
Preparation- Adjust the
name of the Placemark to be “GPS Point”
- Adjust the Latitude and longitude to be the same of the outlet point
- Press Enter. (The placemarklocation will change automatically to be near Makkah)
Latitude 21.498059° N
Longitude 41.601192° E
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 10
Preparation- Now to the GPS
point and inspect nearby streams from the picture.
- Images in Google earth are usually high resolution images that allows for close lookups.
- The area looks to be flat at the outlet
Stream visually identified from sporadic vegetation
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 11
Preparation- It is required to
prepare the DEM and satellite images needed to cover the catchment boundary feeding this stream.
- To get a preliminary estimate of the stream boundary, free GIS data shall be used
Flow direction identified visually from Satellite Image and Elevation in Google Earth
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 12
Preparation- Go to the
Geocommunitywebsite
- Press “S” from the Data –Country Index
- Select Saudi Arabia from the country list
http://data.geocomm.com/catalog/
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 13
Preparation- Select Nation
Wide Data
- Select the “Hydrography –1M – E00 Format.
http
://da
ta.g
eoco
mm
.com
/cat
alog
/
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 14
Preparation- Select to
download the “Drainage –Network” E00 file. Data is free of charge.
- You will need to have a geo-community account in order to download the data.
- The downloaded file is located on the CD and named “KSA-DNNET.E00”
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 15
Preparation- Open “Global
Mapper” Program
- Drag and Drop the “KSA Dnnet.e00” file that we have just downloaded into the main window.
- Press OK on the error message that appears
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 16
Preparation- Global mapper
needs to know the projection of the incoming data to align it correctly
- Select the “Geographic (Latitude/Longitude) as the Projection
- Select the WGS84 as the Datum
- Press OK
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 17
Preparation- All drainage
network of Saudi Arabia shall appear now on the screen
- The delineated streams are of low resolution however they give a good indication of the catchment extents
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 18
Preparation- Go to File >
Export Vector Format
- Select to export vector data as “KML / KMZ”. This is to view the data on Google Earth
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 19
Preparation- Leave all the
export options the same and press OK.
- Name the file “KSA Drainage Network”
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 20
Preparation- Double click the
“KSA Drainage Network” file. It shall open up in Google earth and the streams shall appear on the image
- Now zoom back to the GPS point and inspect the stream network
- Try to define approximately the extent of the catchment
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 21
Preparation- Add a Polygon in
Google earth covering an area more than the catchment extent and name it “DEM Boundary”
- Use the controls in the Upper Right corner to pan and zoom while drawing.
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 22
Preparation- The polygon may
appear as in the figure to the left.
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 23
Preparation- Right click on the
“DEM Boundary” polygon feature that appears in the places tree and select “Save Place As..”
- Save the polygon as “DEM Boundary.kmz” so we can use it later in Global Mapper
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 24
Preparation- Go to
http://srtm.csi.cgiar.org/ in order to download the latest SRTM 3’’ DEM tile for the catchment boundary
- There are many ways to download the SRTM data.
- Scroll down the page and download the SRTM KML file “SRTM41.kmz”
http://srtm.csi.cgiar.org/
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 25
Preparation- Double click on
the SRTM41.kmz file. It shall open up in Google earth
- For viewing purposes, uncheck the box near the “KSA Drainage Network” and make sure that all the SRTM4.1 boxes are checked on
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 26
Preparation- Now zoom out
- You will find a grid lines drawn on the earth showing the boundary of each SRTM tile.
- The file name covering the catchment boundary is “srtm_45_08”
- Click on “Data for” srtm_45_08” to see download options
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 27
Preparation- A popup window
shall appear.
- Scroll down to the Download section
- Select to download “HTTP: Download the DATA tile in zipped GEOTIFF format (from London server)”
- Save the file on your computer “srtm45_08.zip”
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 28
Preparation- Extract data from
“srtm45_08.zip” on your computer
- Drag and drop the srtm_45_08.tif file into global mapper.
- Elevation data shall appear now in global mapper as a color relief box and an elevation scale shall appear on the left
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 29
Preparation- No go to Tools >
Control Center and uncheck the box beside the “KSA dnnet.e00” file to close its layer.
- Press Close
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 30
Preparation- Now Drag and
Drop the “DEM Boundary.kmz” that we have previously created.
- The boundary shall appear as in the figure to the left.
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 31
Preparation- Now press on the
“Feature Info Tool”
- Press OK to the Tip that will appear
- Select anywhere inside the DEM boundary polygon. It should get highlighted in white
- Close the info screen that shall appear. The boundary will remain selected
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 32
Preparation- Go to File >
Export Elevation Grid Format
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 33
Preparation- Select “DEM” for
the Export Format. This is supported by WMS
- Press OK to the Tips that will appear
- On the DEM Export Options, go to Export Bounds and select “Crop to the Selected area feature” and press OK.
- Name the saved file “Cropped DEM.dem”
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 34
Preparation- Open Google
Satellites Map Downloader
- Adjust the settings and download bounds as in the image to the left.
- image bounds can be obtained approximately from Google Earth
- Zoom 15 will result in about 4m resolution image
- Press Download
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 35
Preparation- When Download is
finished, go to Tools > Combine Images
- Select the project file “SaudiDAM.gmidto combine the images into one big bitmap file “Sat Image.bmp”.
- Press Combine
- The final image will be located inside the “C:/Downloads/ SaudiDAM/” folder
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 36
Preparation- Go to
“C:/Downloads/ SaudiDAM/” folder and Drag / Drop the “SAT Image.bmp” file into Global mapper.
- Press OK to the message that will appear
- Select “Geographic” as the projection and “WGS84” as the Datum
- Press OK
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 37
Preparation- The image will
appear to be placed correctly in the drawing. However, it is not orthorectifiedcorrectly.
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 38
Preparation- Go to Tools >
Control Center and right click on the “SAT Image.bmp” file.
- Select RECTIFY
- Press OK to the Tip that will appear.
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 39
Preparation- Press the “Select
Projection” button in the Ground Control Point (GCP) Projection section
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 40
Preparation- Select the
“Mercator” as the projection and “WGS84” as the Datum
- Press OK
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 41
Preparation- Press “YES” to
Reproject the GCPs to the new projection. This is very important.
- Press OK to the RECTIFY dialogue window.
- Now the image is correctly placed and projected.
- Now close all layers except the SAT Image.bmp layer
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 42
Preparation- Go to Tools >
Configure.
- In the Projection tab adjust the projection of the file to be UTM zone 37 North and the datum to be WGS84.
- Press OK
- This will project all the data in the file into the UTM zone 37 projection
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 43
Preparation- Go to File >
Export Raster/Image Format
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 44
Preparation- Go to File >
Export Raster/Image Format
- Press OK to the Tips window
- Leave the JPG Export options unchanged and press OK
- Save the file as “SAT Image.jpg”
- A .prj and .jgw files will be saved automatically with georeferenceinformation
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 45
Step 2: Working inside WMS
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 46
Working inside WMS- Open WMS
version 7.1
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 47
Working inside WMS- Drag and Drop the
“Cropped DEM.dem” file into the WMS main window
- Uncheck the “Smooth DEM on Import”
- Press OK to start importing elevation data
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 48
Working inside WMS- Remember that
the original M data was in Geographic projection (Lat/Long degrees).
- WMS requires to project the data into a plainimetriccoordinate system for delineation.
- Press YES
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 49
Working inside WMS- Now edit the
Project Coordinate system first to be Geographic, WGS84, North and East.
- Then edit the project coordinate system to be UTM Zone 37, WGS84.
- Press OK
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 50
Working inside WMS- Now contour lines
are displayed in the main window.
- The file is projected in UTM zone 37 now
- Coordinates X,Y, and Z of any point is displayed in the lower left bar.
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 51
Working inside WMS- Go to the drainage
Module
- Go to DEM > Compute TOPAZ Flow Data to calculate the flow accumulations
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 52
Working inside WMS- Leave all options
the same and press OK
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 53
Working inside WMS- Adjust the Basin
Areas to “Square Kilometers” and the Distances to “Meters”
- Press OK
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 54
Working inside WMS- When Done,
Press “Close” to the Model wrapper window
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 55
Working inside WMS- Now streams
appear on the plan.
- The default threshold value for drawing streams is 1.0 square kilometers. This value can be changed from the Display options.
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 56
Working inside WMS- Now we need to
place the GPS point in side WMS.
- Given coordinates of the PS point in geographic Lat/long while WMS file now is in UTM Projection
- First open Global Mapper to find the GPS point coordinates in UTM zone 37 coordinates.
- Go to Tools > Coordinate Convertor
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 57
Working inside WMS- Edit the Input
Coordinates and the Output Coordinates as in the figure to the left.
- Write the long/latof the outlet point
- Press Convert to
- Values written in the X and Y fields are the new coordinates to be used in WMS
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 58
Working inside WMS- Open the Terrain
Module in WMS
- Select the “Create Feature Point” button
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 59
Working inside WMS- Place the point
anywhere inside the contour lines
- Copy and paste the X and Y coordinates from Global Mapper to the X and Y Fields inside WMS and press enter
- The feature point location will be changed automatically
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 60
Working inside WMS- Go to the
Drainage Module again
- Zoom in to the Feature Point Location
- Create an outlet point on the stream (blue) nearest the feature point location
Feature Point
Outlet Point
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 61
Working inside WMS- Go to DEM >
Delineate Basins Wizard
- Check the Display feature arc creation option
- Leave the threshold value to 1.0 km2 and press OK
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 62
Working inside WMS- Press OK to
calculate the Basin Data
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 63
Working inside WMS- Catchment
Delineation is Done
- Save the WMS file in a new folder
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 64
Working inside WMS- Select the “Select
drainage unit or basin” button.
- Double click anywhere inside the catchment boundary
- Press on “Unit Hydrograph Method” button
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 65
Working inside WMS- Press on “Basin
Geometrical Attributes”
- The calculated Basin Data will appear.
- When done press Cancel to return to the main WMS window
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 66
Step 3: Verifying the Catchment
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 67
Verifying the Catchment- Drag and Drop the
“SAT Image.jpg” file into the WMS main window
- The image shall appear in its place overlaid over the catchment and streams
- Carefully verify the streams and catchment boundary delineated by WMS with the satellite image.
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 68
Verifying the Catchment- For Some
reasons, it is decided to include stream A in the figure to the left inside the catchment
- The could be because the elevation difference between the stream ad the catchment boundary is small such that water is expected to overtop the boundary
Stream A
Outlet
Catchment Boundary
Flat Area
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 69
Verifying the Catchment- Go to the Terrain
Module
- Press on the “Select DEM Points” button to use this tool
- We are going to manually edit the DEM cells
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 70
Verifying the Catchment- We need to
manually reverse the flow direction of the shown 4 DEM cells to include the additional stream inside the catchment.
Cell 3
Cell 2
Cell 1
Cell 4
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 71
Verifying the Catchment- First Double click
on Cell 3.
- Adjust the flow direction to be downwards
- Press OK
Before
After
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 72
Verifying the Catchment- Uncheck the three
boxes and press OK
- We shall perform these calculations when all edits are done
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 73
Verifying the Catchment- Repeat the same
with Cell 2 then cell 1
Before
After
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 74
Verifying the Catchment- Repeat the same
with Cell 4
Before
After
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 75
Verifying the Catchment- This time check all
the boxes to recalculate everything
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 76
Verifying the Catchment- Stream Direction
is modified
- However, the catchment boundary is not
- Go to DEM > Delineate basin wizard and repeat the delineation process again. Press ok to the warning message that shall appear. Delineation will be repeated using the same outlet point
![Page 77: 3. Catchment Delineation Workflow - UniMasr€¦ · M. Elkordy Catchment Delineation Workflow Dec 2012 Slide 24 Preparation o t-Go ... in global mapper as a color relief box and an](https://reader031.fdocuments.in/reader031/viewer/2022022100/5bacde3b09d3f230528c2ace/html5/thumbnails/77.jpg)
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 77
Verifying the Catchment- Stream Direction
is modified
- However, the catchment boundary is not
- Go to DEM > Delineate basin wizard and repeat the delineation process again. Press ok to the warning message that shall appear. Delineation will be repeated using the same outlet point
![Page 78: 3. Catchment Delineation Workflow - UniMasr€¦ · M. Elkordy Catchment Delineation Workflow Dec 2012 Slide 24 Preparation o t-Go ... in global mapper as a color relief box and an](https://reader031.fdocuments.in/reader031/viewer/2022022100/5bacde3b09d3f230528c2ace/html5/thumbnails/78.jpg)
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 78
- Stream Direction is modified
- However, the catchment boundary is not
- Go to DEM > Delineate basin wizard and repeat the delineation process again. Press ok to the warning message that shall appear. Delineation will be repeated using the same outlet point
Verifying the Catchment
![Page 79: 3. Catchment Delineation Workflow - UniMasr€¦ · M. Elkordy Catchment Delineation Workflow Dec 2012 Slide 24 Preparation o t-Go ... in global mapper as a color relief box and an](https://reader031.fdocuments.in/reader031/viewer/2022022100/5bacde3b09d3f230528c2ace/html5/thumbnails/79.jpg)
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 79
Step 4: Visualizing the Catchment
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 80
Visualizing the catchment- Go to the Map
Module
- Go to CAD > Data -> CAD
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 81
Visualizing the catchment- Go to the Map
Module
- Go to CAD > Data -> CAD
- Save the file.
- An AutoCAD drawing shall appear in the WMS file folder with the same name
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 82
Visualizing the catchment- Drag and drop the
AutoCAD drawing file into Global Mapper
- Press OK
- Define the projection of the CAD drawing as UTM Z37 and WGS84 as datum
- Press OK
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 83
Visualizing the catchment- The delineated
Catchment will appear in place in Global Mapper
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 84
Visualizing the catchment- Go to Tools >
Control Center
- Close all layers except the ACAD Drawing
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 85
Visualizing the catchment- Go to File >
Export Vector Format
- Select KML/KMZ for export format
- Leave all export options the same
- Save the file on your computer
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 86
Visualizing the catchment- Open the KMZ file
in Google Earth
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Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 87
Additional Exercise
Latitude 22° 14’ 17’’ N
Longitude 39° 51’ 04’’ E