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7/26/2019 Catchment Area in Gis Final
1/20
ARC GIS 9.3 TUTORIAL
Yogendra Shrestha
Sanima Hydro and Engineering Page 1
ARC GIS 9.3
TUTORIAL
April 2016
7/26/2019 Catchment Area in Gis Final
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ARC GIS 9.3 TUTORIAL
Yogendra Shrestha
Sanima Hydro and Engineering Page 2
Table of Contents1. Catchment area in GIS 9.3..................................................................................................................... 3
2. Catchment area below 3000 m Elevation ........................................................................................... 13
3. Hydrology Tool not working. ............................................................................................................... 17
4. Remove Zero values of contour of Topo map sheet. .......................................................................... 17
5. Display the data of contour of selected Interval. ............................................................................... 17
6. How to merge the contour ................................................................................................................. 18
7. How to Clip contours .......................................................................................................................... 18
8. How to display elevation on Topo contour data which is exported to AutoCAD ............................... 18
9. How to popup the attributes while converting data from GIS into KML ............................................ 18
7/26/2019 Catchment Area in Gis Final
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ARC GIS 9.3 TUTORIAL
Yogendra Shrestha
Sanima Hydro and Engineering Page 3
1. Catchment area in GIS 9.3
Open Arc GIS
Click on add data
Click on connect to folder and choose DEM files and click on Add. Then following
screen appears
Right click on Layers and then click on properties
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ARC GIS 9.3 TUTORIAL
Yogendra Shrestha
Sanima Hydro and Engineering Page 4
Then following dialogue box will appear. Click on predefined > Nepal Projection >
Nepal_Western > ok
Note : The coordinate system shall be choose on the basis of datum whether the river lies
on Central or Eastern or western.
Click on Go to XY
Add the Latitude and longitude and then click on Add Labeled Point
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ARC GIS 9.3 TUTORIAL
Yogendra Shrestha
Sanima Hydro and Engineering Page 5
Note: for intake location, we need the coordinate of intake, so we take the coordinate from
Google Earth.
Make A shape File
Open Arc Catalog
Right click on folder where you want to create shape file
Click on new
Click on shape file
Then following dialogue box appears
Give the Name: clip file
Choose feature type: Polygon
Click on EditAfter clicking on Edit.
Choosing the coordinate system.
Click on Select
Click on Nepal Projection
Click on Nepal_Western.prj
Click on Add
Then click on OK
After that a shape file is created.
Add the clip file into Arc Map Layers
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ARC GIS 9.3 TUTORIAL
Yogendra Shrestha
Sanima Hydro and Engineering Page 6
Start editing for Clip file
Then choose sketch tool to start drawing polygon.
Draw polygon around the tentativecatchment area
After finishing the drawing right click on
open space
And click on finish sketch F2
Click on Editor
Click on Save Edits
Click on Stop Editing
Then it appears like as below
Click on Arc Tool Window
Click on Data Management Tools
Click on Raster
Click on Raster Processing
Clip
Then add srtm_elev141.img to input raster and Clip in output extent
Click on ok
Click on Spatial Analyst Tools from Arc Tool Box Click on Hydrology
Click on Fill
Then Select srtm_elev141clip on Input surface raster
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ARC GIS 9.3 TUTORIAL
Yogendra Shrestha
Sanima Hydro and Engineering Page 7
Click on ok
Click on Spatial Analyst Tools from Arc Tool Box
Click on Hydrology
Click on flow direction
Select fill_srtm_e1 on Input surface raster
Click on ok
Click on Spatial Analyst Tools from Arc Tool Box
Click on Hydrology
Click on flow accumulation
Select flowdir_fill1 on Input flow direction raster
Click on ok
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ARC GIS 9.3 TUTORIAL
Yogendra Shrestha
Sanima Hydro and Engineering Page 8
Then it appears as
Make a shape file from Arc catalogue Give name as snap pointand feature type Pointand select the respective projection
system from edit tab.
Add the snap pointshape file into Arc map layer box Start editing for snap point
Select the sketch tool
Add a snap point on the white line of river
Click on editor
Save edits
Stop editing
Then a new snap point is added.
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ARC GIS 9.3 TUTORIAL
Yogendra Shrestha
Sanima Hydro and Engineering Page 9
Click on Spatial Analyst Tools from Arc Tool Box
Click on Hydrology
Click on Snap pour point
Add snap point on Input raster or feature pour point data
Add flowAcc_flow1 on input accumulation raster
Then click on ok
It gives the output as snapPou_snap1 in Table of Content
Click on Spatial Analyst Tools from Arc Tool Box
Click on Hydrology
Click on Watershed
The dialogue box appears as above.
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ARC GIS 9.3 TUTORIAL
Yogendra Shrestha
Sanima Hydro and Engineering Page 10
Then add flow direction data in Input flow direction raster
Add snapPou_snap1 data in Input raster or feature Pour point data
Click on ok
Click on Conversion Tools from Arc Tool Box
Click on From Raster
Click on Raster to Polygon
Add Watersh_flow1 in input raster
Remove the tick mark from simplify polygons
Click on Ok
Then it displays the RasterT_watersh1.
This RasterT_watersh1 is the total catchment area of river.
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ARC GIS 9.3 TUTORIAL
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Sanima Hydro and Engineering Page 11
Right click on RasterT_watersh1 Click on open attribute table
Click on Options Click on Add Field
Click on ok
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ARC GIS 9.3 TUTORIAL
Yogendra Shrestha
Sanima Hydro and Engineering Page 12
Right Click on Area
Click on Calculate geometry
Choose unit as Sq. Km
Click on ok
Then it will display the whole
Catchment area in sq. km.
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2. Catchment area below 3000 m Elevation
3D Analyst Tool
Click on Raster Math
Click on Int Add Srtm_elev141_clip to Input rater or constant value. In this add button we must
add the image file after clipping from whole Nepal DHM file.
Then Click on OK
Spatial Analysis Tool Click on Conditional
Click on Set Null
Add Int_strm_ele1 on Input conditional raster and on input false raster or
constant value
Click on SQL
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ARC GIS 9.3 TUTORIAL
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Sanima Hydro and Engineering Page 14
Click on Expression SQL button.
Then condition dialogue box appears and add the condition as VALUE>=3000
Click on ok and also clock ok for set null
Conversion Tool
Click on From raster
Click on Raster to Polygon
Add setNull_int_1 into Input raster
Remove tick mark from simply polylines
Click on Ok
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ARC GIS 9.3 TUTORIAL
Yogendra Shrestha
Sanima Hydro and Engineering Page 15
Clip Analysis
Click on Analysis Tool from Arc tool box
Click on Extract
Click on ClipThen the dialogue box appears.
Add RasterT_SetNull1 to input features
Add RasterT_Watersh1 (which is the total catchment of river) to Clip features.
Click on ok
Then it display the following result
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ARC GIS 9.3 TUTORIAL
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Sanima Hydro and Engineering Page 16
Dissolve
Click on Data Management Tool
Click on Generalization
Click on Dissolve
Click on ok
Calculate Area
Right Click on raster_setnull1_clip_dissol
Open Attribute table
Click on Options
Add field
Give filed Name as Area and Type as Float
Right click on Area
Click on Calculate geometry
Select the units as Sq. km
Click on ok
Then it will display catchment area below 3000 m elevation
Note: For Catchment area below 5000 m elevation, same as above process
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3. Hydrology Tool not working.
Tools Menu
Extension
Tick mark ON at the Spatial Analysis
Ok
4. Remove Zero values of contour of Topo map sheet. Select the contour layer
Start editing
Open attribute table
Right click on COV values
Ascending
Select the zero values cells
Delete it
Save edits
Stop editing
5. Display the data of contour of selected Interval. Selection menu
Select by attributes
Select layers > Contour layers
Click on COV
Type SELECT * FROM Contour WHERE
Cov = 1000 or Cov = 1005 or Cov = 1010 or Cov = 1015 or Cov = 1020
Apply
Ok
In excel
1000 =+Cov= &A1
1005 =B1& or Cov= &A1
1010 Drag the cell
1015
1020
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ARC GIS 9.3 TUTORIAL
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6. How to merge the contour
Delete all zero values of contour
Click on Data management tool from Arc Toolbox
General
Merge
Select contour layers on Input Datasets
Ok
7. How to Clip contours
Analysis Tool
Extract
Clip
Select input features_ all contour layers
Select Clip features_clip layer e.g. Catchment below 3000
Ok
8. How to display elevation on Topo contour data which is exported
to AutoCAD Select the contour layer. Export the data as new field cannot be added on attribute
table
Open Attribute table
Add field name as Elevation
Right Click on Elevation on top. Click on Field Calculator then on Field Calculator select Elevation = Cov
Ok
Then Export the contour data to AutoCAD
9. How to popup the attributes while converting data from GIS into
KML
Select the feature which we want to convert into KMZ then show its label feature by
right click on it
Right Click on the feature
Click on Properties
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ARC GIS 9.3 TUTORIAL
Yogendra Shrestha
Sanima Hydro and Engineering Page 19
Click on HTML POPUP
Show Tick mark on Show content for this layer using the HTML Popup Tool
Click on Ok
Click on Conversion Tool
To KML
Layer to KML
Add the Hydropower_Operating Layer into Layer
Give the name to Output file
Give scale
Click on ok
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Open KMZ file
Then the result display as follow
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