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Delineating Sub-Watersheds Using Terrain Analysis in ArcInfo

Chris Klaube Landscape Ecology 704:450. Delineating Sub-Watersheds Using Terrain Analysis in ArcInfo. Objectives Rundown in ArcInfo Workstation Speedbumps / Caveats Results Discussion. The Task. Delineate subwatershed boundaries using DEM and Contour layers HUC-23 to HUC-26

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Delineating Sub-Watersheds Using Terrain Analysis in ArcInfo

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  1. Chris KlaubeLandscape Ecology 704:450 Delineating Sub-Watersheds Using Terrain Analysis in ArcInfo

  2. Objectives • Rundown in ArcInfo Workstation • Speedbumps / Caveats • Results • Discussion

  3. The Task • Delineate subwatershed boundaries using DEM and Contour layers • HUC-23 to HUC-26 • HUC- Hydrological Unit Code

  4. The Watershed

  5. Goals • To compare stream layer derived from county with stream layer created from DEM • To create a 2-ft Contour layer for the entire watershed

  6. Data • Original DEM and Contour layers from NJDEP • Monmouth County provided original stream layer

  7. ArcInfo Commands streamorder streamlink streamline watershed import project fill flowdirection flowaccumulation *streamnet

  8. streamnet • Set threshold for the flow accumulation at several different values in order to create a stream layer with the right intricacy • Usagestreamnet = con(flowacc>2000, 1) • Set at: 2,000 -- 1,000 – 500

  9. Stream Layers

  10. Creating Contours • Original Contour layer used to delineate HUC-polygons was at a 10-ft interval • Used ArcInfo to create 2-ft interval contour • Usage: LATTICECONTOUR <in_lattice> <out_cover> <interval> {base_contour} {contour_item} {weed_tolerance} {z_factor}

  11. Caveats • New layers created by ArcInfo were in UTM projection • Used ArcMap and ArcCatalog to redefine in NJ Stateplane  Arc Toolbox  Data Management Tools  Projections and Transformations • New Contours begin at elevation ‘0’

  12. References • ESRI GIS and Mapping: Support Center. 2006. <http://support.esri.com/>

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