3D Analyst - Watershed

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Information about 3D Analyst - Watershed

Published on May 23, 2007

Author: httsan

Source: slideshare.net

Description

Delineate a Watershed Area and Find the Streams of the Rivers Using Spatial and 3D Analyst
by Candra Dewi

Delineate a Watershed Area and Find the Streams of the Rivers Using Spatial and 3D Analyst Candra Dewi G051060021

Study Area And Data Study Area Location : Malang, East Java, Indonesia Coordinate : UTM Projection , WGS84 Datum Data SRTM data : S08E111.hgt DEM data : exported from SRTM Data using Global Mapper software, 90m x 90m resolution with interpolate to fill small gaps in data

Study Area

Location : Malang, East Java, Indonesia

Coordinate : UTM Projection , WGS84 Datum

Data

SRTM data : S08E111.hgt

DEM data : exported from SRTM Data using Global Mapper software, 90m x 90m resolution with interpolate to fill small gaps in data

Study Area And Data S08E111.hgt

General steps to determine watershed : Filling the sinks of the DEM increasing the elevation of the points that are fictitious pits Determining the flow direction identifying the cell towards which water will flow Calculating the flow accumulation evaluating the drainage area in units of grid cells Identifying the stream cells flagging those cells with a flow accumulation value greater than a certain user-defined threshold value Labeling the sinks assigning a label (number) to each reach of the stream network Delineating the watershed for each link determining the incremental drainage area associated with each link

Filling the sinks of the DEM

increasing the elevation of the points that are fictitious pits

Determining the flow direction

identifying the cell towards which water will flow

Calculating the flow accumulation

evaluating the drainage area in units of grid cells

Identifying the stream cells

flagging those cells with a flow accumulation value greater than a certain user-defined threshold value

Labeling the sinks

assigning a label (number) to each reach of the stream network

Delineating the watershed for each link

determining the incremental drainage area associated with each link

DEM Data

Sink Filling

Flow Direction ( [Filled DEM].FlowDirection(FALSE))

( [Filled DEM].FlowDirection(FALSE))

Flow Accumulation ([Flow Dir].FlowAccumulation(NIL))

([Flow Dir].FlowAccumulation(NIL))

Identifying Stream ([Flow Acc] < 750.AsGrid).SetNull(1.AsGrid)

([Flow Acc] < 750.AsGrid).SetNull(1.AsGrid)

Labeling the Link ([Stream750].StreamLink([Flow Dir]))

([Stream750].StreamLink([Flow Dir]))

Determining Watersheds ([Flow Dir].Watershed([Stream Link]))

([Flow Dir].Watershed([Stream Link]))

3D Scene

 

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