3D Analyst - Watershed, Padang

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Information about 3D Analyst - Watershed, Padang

Published on May 23, 2007

Author: httsan

Source: slideshare.net

Description

Deliniate Watershed in Padang Using ArcGIS Spatial Analyst
by Inda Merliana

Deliniate Watershed in Padang Using ArcGIS Spatial Analyst Inda Merliana G051060081

Introduction Background The major factor caused the damage is the existence of various activity convert the forest which heedless of the conservation aspect, like activity of forest didn't manage properly legal goodness The bare land left from irresponsible forest activity has converted into critical watershed that have a high risk for being degraded and need a special attention. Objectives Generate watersheds based on DEM from SRTM data To understand the process of hydrological modelling using ArcGIS spatial analyst tool

Background

The major factor caused the damage is the existence of various activity convert the forest which heedless of the conservation aspect, like activity of forest didn't manage properly legal goodness

The bare land left from irresponsible forest activity has converted into critical watershed that have a high risk for being degraded and need a special attention.

Objectives

Generate watersheds based on DEM from SRTM data

To understand the process of hydrological modelling using ArcGIS spatial analyst tool

Data and Software Needed Data Needed SRTM data (In this project using padang area {S01E099, S01E100, S02E100}) River, Linriver and Watershed in shapefile format Software Needed 3DEM Terrain Visualization ArcGIS 9.2 Cosmo Player

Data Needed

SRTM data (In this project using padang area {S01E099, S01E100, S02E100})

River, Linriver and Watershed in shapefile format

Software Needed

3DEM Terrain Visualization

ArcGIS 9.2

Cosmo Player

Procedural Steps Create DEM from SRTM data Remove Error Sink in the DEM Generate Flow Direction Generate Flow Accumulation Generating Channel Generating Stream Link Generating Watershed

Create DEM from SRTM data

Remove Error Sink in the DEM

Generate Flow Direction

Generate Flow Accumulation

Generating Channel

Generating Stream Link

Generating Watershed

Prepare the SRTM data Before starting 3dem software, we have to register the SRTM data first. Open 3dem terrain visualization and load terrain model from menu file

Before starting 3dem software, we have to register the SRTM data first.

Open 3dem terrain visualization and load terrain model from menu file

Prepare the SRTM data (2) SRTM data will appear, but first convert SRTM data projection to UTM from menu operation >> change projection. Select the small area from this SRTM data by clicking F8 or choose F8 from menu operation

SRTM data will appear, but first convert SRTM data projection to UTM from menu operation >> change projection.

Select the small area from this SRTM data by clicking F8 or choose F8 from menu operation

Prepare the SRTM data (3) After the area being small then save it in tif format, but if it not, do the same process like before by clicking F8 >> drag the area and then press enter

After the area being small then save it in tif format, but if it not, do the same process like before by clicking F8 >> drag the area and then press enter

Create DEM From SRTM Data Open the ArcGIS 9.2. Activate spatial analyst extention from menu tools >> extention

Open the ArcGIS 9.2. Activate spatial analyst extention from menu tools >> extention

Create DEM From SRTM Data (2) Add the data (tif format)

Add the data (tif format)

Create DEM From SRTM Data (3) From padang.tif layer properties change the type to minimum-maximum from symbology

From padang.tif layer properties change the type to minimum-maximum from symbology

Remove Error Sink in the DEM (1) The DEM provided padang.tif is floating point real. Because elevations are whole numbers we convert the DEM to integer. Do this with the Raster Calculator under the pull-down menu Spatial Analyst. The output is a temporary GRID. To make it permanent right click the feature class and select Make Permanent.

The DEM provided padang.tif is floating point real. Because elevations are whole numbers we convert the DEM to integer. Do this with the Raster Calculator under the pull-down menu Spatial Analyst. The output is a temporary GRID. To make it permanent right click the feature class and select Make Permanent.

Remove Error Sink in the DEM (2) To remove an error sink, we use the Fill tool in Hydrological Modeling Tools Use ArcToolBox for this operation ArcToolBox is accessible in ArcMap. Navigate to Spatial Analyst Tools and select Fill Tool. The model asks for an input feature class and an output feature class.

To remove an error sink, we use the Fill tool in Hydrological Modeling Tools

Use ArcToolBox for this operation ArcToolBox is accessible in ArcMap. Navigate to Spatial Analyst Tools and select Fill Tool. The model asks for an input feature class and an output feature class.

Generate Flow Direction Use the tool Flow Direction to generate a raster grid showing the direction of flow

Use the tool Flow Direction to generate a raster grid showing the direction of flow

Generate Flow Accumulation Use the tool Flow Accumulation to generate a raster grid showing the direction of flow

Use the tool Flow Accumulation to generate a raster grid showing the direction of flow

Generating Channel Based on our flow accumulation, we can map stream channels where the water flows. This channel is based on the number of cells which flow into a specific cell. If we want large channels we use a larger number. For this project we will map all cells that has at least 500 cells that flow into it.

Based on our flow accumulation, we can map stream channels where the water flows. This channel is based on the number of cells which flow into a specific cell. If we want large channels we use a larger number. For this project we will map all cells that has at least 500 cells that flow into it.

Generating Stream Link After we have mapped stream channels we have to assign each individual stream segments a unique number. This is done with the tool Stream Link tool The model asks for two input stream raster and input flow direction raster and output raster.

After we have mapped stream channels we have to assign each individual stream segments a unique number. This is done with the tool Stream Link tool

The model asks for two input stream raster and input flow direction raster and output raster.

Generating Watershed Next, we can generate watersheds as the final steps in hydrologic modelling. Use the tool Watershed from spatial analyst tool

Next, we can generate watersheds as the final steps in hydrologic modelling. Use the tool Watershed from spatial analyst tool

Result By activate two layers, padang_wsd and padang_stl, we can see the result from this project

By activate two layers, padang_wsd and padang_stl, we can see the result from this project

Result in 3D View Open ArcScene to view the watershed deliniation in 3D view

Open ArcScene to view the watershed deliniation in 3D view

Result View In Cosmo Player

Thanks for your attention

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