[GRASS-user] Water boundaries to stream network...

[michael vetter]

If you need a centerline of a river system, i have a shell script for you.

To derive a centerline of a polygon you can use the v.centerline.sh
(download at http://www.uibk.ac.at/geographie/personal/michael_vetter).
The script needs an input polygon as a grass boundary and calculates a
centerline of the polygon (output of r.thin and some v.clean tools). you
have
to change the cleaning parameters (thresh and smooth) to get a nice
centerline.

If your resolution is to small, you will have a very bad performance
(because of
r.thin).

Michael


Jonathan Greenberg-2 wrote:
> 
> I have a large, complex single polygon (with donuts) that represents the 
> boundary of the Sacramento Bay Delta rivers -- I would like to generate 
> a line network running down the center of this boundary, but I'm having 
> a hard time accomplishing this.  Any ideas?  I believe this is referred 
> to as the polygon "skeleton".
> 
> --j
> 
> 
> -- 
> 
> Jonathan A. Greenberg, PhD
> Postdoctoral Scholar
> Center for Spatial Technologies and Remote Sensing (CSTARS)
> University of California, Davis
> One Shields Avenue
> The Barn, Room 250N
> Davis, CA 95616
> Cell: 415-794-5043
> AIM: jgrn307, MSN: jgrn307 at hotmail.com, Gchat: jgrn307
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> 
> 

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