3D Analyst - Watershed Lorelindu
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This document summarizes steps taken to create a geographic information system (GIS) model of watershed areas in Lore Lindu National Park, Indonesia. The steps included: (1) creating a digital elevation model from satellite data, (2) removing errors, (3) generating flow direction and accumulation maps, (4) mapping stream channels based on areas with over 500 cells of accumulated flow, (5) generating stream links, (6) delineating watersheds, (7) visualizing the 3D model, and (8) comparing generated streams to topography.
3D Analyst - Watershed Lorelindu
- 1. WATERSHED AREA IN LORE LINDU NATIONAL PARK ADVANCED GEOGRAPHIC INFORMATION SYSTEM (ITM 524) BROTO RAHARJO G051054021
- 2. 1. CREATE DEM FROM SRTM S02E119 – S02E120 Global Mapper 7.04 3DEM (Opensource, downloaded from www.terrainmap.com)
- 3. Select smaller area and project to UTM coordinate Save as GeoTiff ( lorelindu.tif ) Open lorelindu.tif in ArcGIS
- 4. Create integer value from floating value Lorelindu_int.tif
- 5. 2. REMOVE ERROR SINK Lorelindu_fil.tif
- 6. 3. CREATE FLOW DIRECTION Lorelindu_flo.tif
- 7. 4. CREATE FLOW ACCUMULATION Lorelindu_fla.tif
- 8. 5. GENERATING STREAM 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. Because the cell size is 90 m, these means we are mapping all cells that have a drainage area of at least 90 x 90 x 500 = 4.05 km2. Lrlindu_fla5.tif
- 9. 6. GENERATING STREAM LINK Lrlindu_strm.tif Stream channel 500 Flow direction
- 10. 7. GENERATING WATERSHED Lrlindu_wshd.tif Flow direction Stream link
- 11. 8. 3D VISUALIZATION IN ARCSCENE
- 12. 9. COMPARISON BETWEEN GENERATED STREAM CHANNEL AND TOPOGRAPHIC ____ Generated stream channel ____ Topographic
- 14. THANK YOU