Watershed analysis by GIS

This presentation is a instructor teaching material created by CERI for JICA training programs for watershed management and flood controls. For self-learning, ArcGIS help on the ESRI website is also useful to learn.

CERI: Civil Engineering Research Institute for Cold Region

Cold-Region Hydraulic and Aquatic Environment Engineering Research Group

• STEP1: Mosaic SRTM images to one layer

• STEP2: Create a watershed layer from DEM

• STEP3: Mosaic LANDSAT images to one layer

• STEP4: Clip LANDSAT layer by the watershed layer

• STEP5: Land use analyses by MultiSpec

2

Images from ArcGIS Online Help

Reading SRTM data

3

Mosaic to new raster

4

Mosaic to new raster

5

Applying symbology

6

Applying symbology

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Spatial Reference: Lat & Lon

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Using Online Maps

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Project Raster

• Latitude & Longitude(Degree)

• UTM Zone 51N (Meter)

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Project Raster

• Select

• Projected Coordinate Systems

• UTM

• WGS 1984

• Northern Hemisphere

• WGS 1984 UTM Zone 51N.prj

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Spatial reference: UTM

12

• STEP1: Mosaic SRTM images to one layer

• STEP2: Create a watershed layer from DEM

• STEP3: Mosaic LANDSAT images to one layer

• STEP4: Clip LANDSAT layer by the watershed layer

• STEP5: Land use analyses by MultiSpec

13

An overview of the Hydrology tools

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Images from ArcGIS Online Help

Hydrology: Fill

15

Images from ArcGIS Online Help

Hydrology: Fill

16

Hydrology: Flow Direction

Creates a raster of flow direction from each cell to

its steepest downslope neighbor.

17

Images from ArcGIS Online Help

Hydrology: Flow Direction

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Hydrology: Flow Direction

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Hydrology: Flow Accumulation

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Generating flow accumulation data

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Conditional Tools: Con

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Conditional Tools: Con

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Hydrology: Stream Link

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Hydrology: Stream Link

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Hydrology: Watershed

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Hydrology: Watershed

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Hydrology: Watershed

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Hydrology: Watershed

• Creating a watershed by using outlet.shp

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Hydrology: Watershed

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Conversion Tools: Raster to Polygon

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Conversion Tools: Raster to Polygon

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• STEP1: Mosaic SRTM images to one layer

• STEP2: Create a watershed layer from DEM

• STEP3: Mosaic LANDSAT images to one layer

• STEP4: Clip LANDSAT layer by the watershed layer

• STEP5: Land use analyses by MultiSpec

33

Reading Landsat data

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Combining 6 bands to one layer

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• LANDSAT

– Band1: Blue

– Band2: Green

– Band3: Red

Combining 6 band to one layer

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Combining 6 bands into one layer

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Apply symbology

• LANDSAT

– Red: Band3

– Green: Band2

– Blue: Band1

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Mosaic LANDSAT images to a layer

• Mosaic Operater: MAXIMUM

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Mosaic LANDSAT images to a layer

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• STEP1: Mosaic SRTM images to one layer

• STEP2: Create a watershed layer from DEM

• STEP3: Mosaic LANDSAT images to one layer

• STEP4: Clip LANDSAT layer by the watershed layer

• STEP5: Land use analyses by MultiSpec

41

Clip LANDSAT layer

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Clip Landsat layer

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