cee 5224 - advanced gis working with tnrcc’s watershed delineator by mark dougherty
Post on 18-Dec-2015
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CEE 5224 - Advanced GIS
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
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
Nuts and Bolts (cont.)
Watershed Delineator provides three major functionality areas:
1. Interactive delineation and data entry
2. Utilities
3. Miscellaneous functions
CEE 5224 - Advanced GIS
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
Miscellaneous functions
Merge Selected Polygons Subtract Selected Polygons DEM Extraction Flow Tracing No-preprocessing Watershed Delineation Display of Table Structures
CEE 5224 - Advanced GIS
How do I get started with Watershed Delineator?
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.
CEE 5224 - Advanced GIS
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
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
Batch Processing:Delineate on SegmentsDelineate on PolygonsDelineate 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
Other delineation tools
• A new Avenue script is available on the ESRI site:
CEE 5224 - Advanced GIS
Other resources from ESRI
• Search ESRI’s Web Site for keyword
“Watershed Delineator”
• You will get the following titles:
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