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
/
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Sent: Wednesday, January 23, 2008 7:15 AM
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Subject: [GRASS-user] Use of r.watershed
Hello All,
I am new to GRASS but have been using GIS (mainly ESRI products
://chuck.ehlschlaeger.info/
-Original Message-
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[mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: Wednesday, January 23, 2008 7:15 AM
To: grass-user@lists.osgeo.org
Subject: [GRASS-user] Use of r.watershed
Hello All,
I am new to GRASS but have been using GIS (mainly ESRI
Of
[EMAIL PROTECTED]
Sent: Wednesday, January 23, 2008 8:52 AM
To: Charles Ehlschlaeger
Cc: grass-user@lists.osgeo.org
Subject: RE: [GRASS-user] Use of r.watershed
Chuck,
Thanks for your reply. The DEM has 8,627 rows and 10,270 columns.
The command line statement I used is:
r.watershed el=fill th
AM
To: grass-user@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
Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: Wednesday, January 23, 2008 8:52 AM
To: Charles Ehlschlaeger
Cc: grass-user@lists.osgeo.org
Subject: RE: [GRASS-user] Use of r.watershed
Chuck,
Thanks for your reply. The DEM has 8,627
On Jan 23, 2008 6:28 PM, [EMAIL PROTECTED] wrote:
Thanks for pointing out the excerpt from the manual. So, based on
that it seems that r.watershed will take longer to run than the
ArcHydro tools. How much longer? I guess I will just let it run and
see if I can find out. Then I will run
hydromodeling.com wrote:
I have also tried using the -m and -4 flags placed after the
r.watershed part.
On modern systems using -m will slow it down a lot for minor memory
savings. Don't use it. I wouldn't bother with -4 either.
r.terraflow
note as far as output basins go this calculates
Markus:
see also here for some comparison:
http://www.cs.duke.edu/geo*/terraflow/speedup.html
it doesn't list GRASS version but from the Pentium III and March 2001
references I would expect that the version of r.watershed there was
from GRASS 5.0 and using the old color setting code which
