3. catchment delineation workflow - unimasr€¦ · m. elkordy catchment delineation workflow dec...
TRANSCRIPT
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 1
Catchment Delineation Workflow
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)
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
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
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 5
Step1: Preparation
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
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 7
Preparation- Open Google Earth. (Make sure that you use the latest version)
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 8
Preparation- Now add a Placemark. Place it Anywhere.
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
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
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
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/
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
/
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”
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
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
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
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
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”
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
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.
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 22
Preparation- The polygon may
appear as in the figure to the left.
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
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/
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
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
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”
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
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
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.
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
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 32
Preparation- Go to File >
Export Elevation Grid Format
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”
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
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
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
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.
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.
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 39
Preparation- Press the “Select
Projection” button in the Ground Control Point (GCP) Projection section
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 40
Preparation- Select the
“Mercator” as the projection and “WGS84” as the Datum
- Press OK
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
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
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 43
Preparation- Go to File >
Export Raster/Image Format
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
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 45
Step 2: Working inside WMS
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 46
Working inside WMS- Open WMS
version 7.1
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
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
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
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.
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
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 52
Working inside WMS- Leave all options
the same and press OK
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
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 54
Working inside WMS- When Done,
Press “Close” to the Model wrapper window
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.
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
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
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
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
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
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
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 62
Working inside WMS- Press OK to
calculate the Basin Data
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
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
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
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 66
Step 3: Verifying the Catchment
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.
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
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
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
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
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
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 73
Verifying the Catchment- Repeat the same
with Cell 2 then cell 1
Before
After
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 74
Verifying the Catchment- Repeat the same
with Cell 4
Before
After
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 75
Verifying the Catchment- This time check all
the boxes to recalculate everything
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
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
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
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 79
Step 4: Visualizing the Catchment
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 80
Visualizing the catchment- Go to the Map
Module
- Go to CAD > Data -> CAD
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
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
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 83
Visualizing the catchment- The delineated
Catchment will appear in place in Global Mapper
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
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
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 86
Visualizing the catchment- Open the KMZ file
in Google Earth
Catchment Delineation WorkflowM. Elkordy Catchment Delineation Workflow
Dec 2012Slide 87
Additional Exercise
Latitude 22° 14’ 17’’ N
Longitude 39° 51’ 04’’ E