[GRASS-user] Use of r.watershed

[Charles Ehlschlaeger]

How many rows and columns are in the input map? Also include the exact
command line statement you use to run the program.

Sincerely, chuck

Chuck Ehlschlaeger, Geospatial Science Consultant
PERTAN GROUP, http://pertan.com/
c.ehlschlaeger at insightbb.com, 309-255-2727
http://chuck.ehlschlaeger.info/


-----Original Message-----
From: grass-user-bounces at lists.osgeo.org
[mailto:grass-user-bounces at lists.osgeo.org] On Behalf Of
hydro at hydromodeling.com
Sent: Wednesday, January 23, 2008 7:15 AM
To: grass-user at lists.osgeo.org
Subject: [GRASS-user] Use of r.watershed

Hello All,

I am new to GRASS but have been using GIS (mainly ESRI products) for  
quite a few years.  I am trying to learn how to use GRASS to carry out  
hydrology related analyses.  Currently, I am trying to use the  
r.watershed command to delineate the basins for a watershed.  My  
question is, how long would you expect it to take to run?  I am  
wondering if I am doing it wrong or if it just takes longer than I  
would expect.  The DEM is about 170MB TIFF before I import it to  
GRASS.  I have tried to run it a few times using different options,  
each time letting it run for 3 - 4 hours before killing it. I have  
tried both the -m and -4 flags.  Any input would be appreciated.
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