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Here is a page with different command to extract river network:<br>
<br>
<a class="moz-txt-link-freetext" href="http://skagit.meas.ncsu.edu/~helena/grasswork/grassclass/grass5tutor02/rflow.phtml">http://skagit.meas.ncsu.edu/~helena/grasswork/grassclass/grass5tutor02/rflow.phtml</a><br>
<br>
Chears, Max<br>
<br>
Christopher Fonnesbeck wrote:<br>
<blockquote type="cite"
cite="mid31D9DD8E-51CA-11D8-9C83-000A956FDAC0@fonnesbeck.org">I am
having a great deal of trouble extracting a useable stream layer from a
DEM using r.terraflow. Using r.mapcalc and r.thin, I am able to derive
a layer that can be converted to a vector, but the resulting stream
network has all sorts of broken lines and capillary-like artifacts (see
attached file). I would use r.watershed, but my coverage is too large
(about 3000 x 3000). Any tips from others that have successfully
derived stream layers in GRASS?
<br>
<br>
Thanks,
<br>
Chris
<br>
--
<br>
Christopher J. Fonnesbeck ( c h r i s @ f o n n e s b e c k . o r g )
<br>
Georgia Cooperative Fish & Wildlife Research Unit, University of
Georgia<br>
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<pre class="moz-signature" cols="50">--
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note: change my e-mail reference to <a class="moz-txt-link-abbreviated" href="mailto:massimiliano.cannata@supsi.ch">massimiliano.cannata@supsi.ch</a>
because the old one will be deleted soon.
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Ing. Massimiliano Cannata
Istituto di Scienze della Terra - SUPSI
C.P. 72 - CH-6952 Canobbio (Ticino, Switzerland)
Tel +41 91 /935 12 25 - Fax +41 91 /935 12 09
eMail: <a class="moz-txt-link-abbreviated" href="mailto:massimiliano.cannata@supsi.ch">massimiliano.cannata@supsi.ch</a>
Internet: <a class="moz-txt-link-freetext" href="http://www.ist.supsi.ch">http://www.ist.supsi.ch</a>
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