CEE Advanced GIS Working with TNRCC’s Watershed Delineator by Mark Dougherty
CEE 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 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 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 Advanced GIS Interactive delineation and data entry Point Delineation Segment Delineation Batch Point Definition Batch Polygon Definition Batch Delineation Batch Point Delineation Batch Segment Delineation Batch Polygon Delineation
CEE Advanced GIS Utilities GRID Preprocessing Vector Preprocessing Tag Operations
CEE Advanced GIS Miscellaneous functions Merge Selected Polygons Subtract Selected Polygons DEM Extraction Flow Tracing No-preprocessing Watershed Delineation Display of Table Structures
CEE 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 Advanced GIS 2. Copy.avx file to EXT32.
CEE Advanced GIS 3. Load two file extensions.
CEE Advanced GIS Watershed Delineator interface
CEE Advanced GIS Hydro pull-down menus Grid preprocessing Vector preprocessing
CEE 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 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 Advanced GIS 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 Advanced GIS How does Delineator work?
CEE Advanced GIS Source: Watershed Delineator documentation
CEE Advanced GIS
What does the display look like?
CEE Advanced GIS
Other delineation tools A new Avenue script is available on the ESRI site:
CEE Advanced GIS Other resources from ESRI Search ESRI’s Web Site for keyword “Watershed Delineator” You will get the following titles:
CEE Advanced GIS Questions?