The simplest method would to employ the procedures used for
defining rivers:
1) fill sinks
2) flow direction
3) flow accumulation
4) select cells with flow accumulation greater than a threshold
5) streamline
You may need some smoothing (focalmean) for better results. Or
you might run into bad surprises.
harvey
On 2/14/2011 2:59 PM, Danelle Heatwole wrote:
Hi,
I have bathymetric data for the Columbia River Estuary in a
terrain model and am trying to generate a thalweg line
representing the deepest part of the river channel all along
this length. Of course, the elevation of the thalweg changes
drastically over this distance. Any ideas on the simplest way to
generate the line? I've thought of generating contours and
manually selecting (or tracing) the deepest ones, but is there a
tool that would do this for me?
Thank you!!
Danelle
--
Danelle Heatwole
Research Scientist
Wetland Ecosystem Team
School of Aquatic & Fishery Sciences
University of Washington
1122 NE Boat St / Box 355020
Seattle, WA 98195-5020
(206) 221-6885
[email protected] <mailto:[email protected]>
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--
http://gis.ess.washington.edu/
[email protected] 374 Johnson Hall 206-685-7981
Harvey Greenberg
University of Washington
Department of Earth and Space Sciences
College of the Environment
Box 351310
Seattle WA 98195-1310
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