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Working with TNRCC’s Watershed Delineator

Working with TNRCC’s Watershed Delineator. by Mark Dougherty. What is Watershed Delineator?. Watershed Delineator is a set of procedures, tools, and utilities… developed by TNRCC and ESRI… to delineate watershed boundaries on a digital elevation model. Nuts and Bolts.

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Working with TNRCC’s Watershed Delineator

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  1. Working with TNRCC’s Watershed Delineator by Mark Dougherty CEE 5224 - Advanced GIS

  2. What is Watershed Delineator? • Watershed Delineator is a set of procedures, tools, and utilities… • developed by TNRCC and ESRI… • to delineate watershed boundaries on a digital elevation model. CEE 5224 - Advanced GIS

  3. Nuts and Bolts • Watershed Delineator is a series of algorithms… • developed in ArcView’s command language (Avenue script)… • as an “add-on” extension. • Watershed Delineator makes the modeling process more efficient because it requires no external file sharing. CEE 5224 - Advanced GIS

  4. Nuts and Bolts (cont.) Watershed Delineator provides three major functionality areas: • Interactive delineation and data entry • Utilities • Miscellaneous functions CEE 5224 - Advanced GIS

  5. Interactive delineation and data entry Point Delineation Segment Delineation Batch Point Definition Batch Polygon Definition Batch DelineationBatch Point Delineation Batch Segment Delineation Batch Polygon Delineation CEE 5224 - Advanced GIS

  6. Utilities GRID Preprocessing Vector Preprocessing Tag Operations CEE 5224 - Advanced GIS

  7. Miscellaneous functions Merge Selected Polygons Subtract Selected Polygons DEM Extraction Flow Tracing No-preprocessing Watershed Delineation Display of Table Structures CEE 5224 - Advanced GIS

  8. 1. Find a copy of WshdDel.avx script. Script is available on ESRI’s Water Resources CD (1999). Script was not found on either the ESRI or the CRWR websites. How do I get started with Watershed Delineator? CEE 5224 - Advanced GIS

  9. 2. Copy .avx file to EXT32. CEE 5224 - Advanced GIS

  10. 3. Load two file extensions. CEE 5224 - Advanced GIS

  11. Watershed Delineator interface CEE 5224 - Advanced GIS

  12. Hydro pull-down menus Grid preprocessing Vector preprocessing CEE 5224 - Advanced GIS

  13. Delineation Files Fill Sinks Flow Direction Flow Accumulation Stream Definition Stream Segmentation Watershed Subdelineation Line GRID to Shape Poly GRID to Shape Dissolve Streamless Polygons Define Table Structures Stream Segment Processing Identify Head Sections Create Aggregated Subwatersheds CEE 5224 - Advanced GIS

  14. Delineation Files sets up themes used in the delineation process Reference to the appropriate data set is achieved through use of theme tags . CEE 5224 - Advanced GIS

  15. Batch Processing: Delineate on Segments Delineate on Polygons Delineate on Points Extract GRID by Delineate on pt. Polygon (no preproc.) Rectangle Trace flow path Circle Subtract polygns Calculate flow length and Tc [not shown] Add an Outlet Point Delineate on a Segment Delineate on a Point CEE 5224 - Advanced GIS

  16. How does Delineator work? CEE 5224 - Advanced GIS

  17. Source: Watershed Delineator documentation CEE 5224 - Advanced GIS

  18. CEE 5224 - Advanced GIS

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  20. What does the display look like? CEE 5224 - Advanced GIS

  21. CEE 5224 - Advanced GIS

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  27. Other delineation tools • A new Avenue script is available on the ESRI site: CEE 5224 - Advanced GIS

  28. Other resources from ESRI • Search ESRI’s Web Site for keyword “Watershed Delineator” • You will get the following titles: CEE 5224 - Advanced GIS

  29. Questions? CEE 5224 - Advanced GIS

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