cee 5224 - advanced gis working with tnrcc’s watershed delineator by mark dougherty

CEE 5224 - Advanced GIS

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

• 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.


Nuts and Bolts (cont.)

Watershed Delineator provides three major functionality areas:

1. Interactive delineation and data entry

2. Utilities

3. Miscellaneous functions


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


Utilities

GRID Preprocessing Vector Preprocessing Tag Operations


Miscellaneous functions

Merge Selected Polygons Subtract Selected Polygons DEM Extraction Flow Tracing No-preprocessing Watershed Delineation Display of Table Structures


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.


2. Copy .avx file to EXT32.


3. Load two file extensions.


Watershed Delineator interface


Hydro pull-down menus

Grid preprocessing

Vectorpreprocessing


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


Delineation Files sets up themes used in the delineation process

Reference to the appropriate data set is achieved through use of theme tags .


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


How does Delineator work?


Source: Watershed Delineator documentation


What does the display look like?


Other delineation tools

• A new Avenue script is available on the ESRI site:


Other resources from ESRI

• Search ESRI’s Web Site for keyword

“Watershed Delineator”

• You will get the following titles:


Questions?

cee 5224 - advanced gis working with tnrcc’s watershed delineator by mark dougherty

Documents

advanced gis slide

point slide

advanced gis nuts

advanced gis delineation

advanced gis source

advanced gis batch processing

aggregated subwatersheds

mark dougherty slide