catchment area in gis final

7/26/2019 Catchment Area in Gis Final

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ARC GIS 9.3 TUTORIAL

Yogendra Shrestha

Sanima Hydro and Engineering Page 1

ARC GIS 9.3

TUTORIAL

April 2016


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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


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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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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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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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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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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 Hydrology

Click on flow accumulation

Select flowdir_fill1 on Input flow direction raster

Click on ok


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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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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 Hydrology

Click on Watershed

The dialogue box appears as above.


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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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Right click on RasterT_watersh1 Click on open attribute table

Click on Options Click on Add Field

Click on ok


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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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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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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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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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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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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

catchment area in gis final

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