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.
-----Original Message-----
From: grass-user-bounces@lists.osgeo.org
[mailto:grass-user-bounces@lists.osgeo.org] On Behalf Of
hydro@hydromodeling.com
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 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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-----Original Message-----
From: grass-user-bounces@lists.osgeo.org
[mailto:grass-user-bounces@lists.osgeo.org] On Behalf Of
hydro@hydromodeling.com
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 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.
_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
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8:12 PM
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8:12 PM
I am running GRASS version 6.2.2 on Ubuntu 7.10. I am at work right now and don't have access to the machine, but I am pretty sure about the GRASS version. If I am wrong I will post a correction when I get home.
Matt
Quoting Markus Neteler <neteler@osgeo.org>:
Matt,
please also post to the list which GRASS version on which
operating system you use.
Markus
On Jan 23, 2008 3:51 PM, <hydro@hydromodeling.com> wrote:
Chuck,
Thanks for your reply. The DEM has 8,627 rows and 10,270 columns.
The command line statement I used is:
I have also tried using the -m and -4 flags placed after the r.watershed part.
Thanks,
Matt
Quoting Charles Ehlschlaeger <c.ehlschlaeger@insightbb.com>:
> 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@insightbb.com, 309-255-2727
> http://chuck.ehlschlaeger.info/
>
> -----Original Message-----
> From: grass-user-bounces@lists.osgeo.org
> [mailto:grass-user-bounces@lists.osgeo.org] On Behalf Of
> hydro@hydromodeling.com
> 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 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.
> _______________________________________________
> grass-user mailing list
> grass-user@lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-user
>
> No virus found in this incoming message.
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> Version: 7.5.516 / Virus Database: 269.19.9/1238 - Release Date: 1/22/2008
> 8:12 PM
>
> No virus found in this outgoing message.
> Checked by AVG Free Edition.
> Version: 7.5.516 / Virus Database: 269.19.9/1238 - Release Date: 1/22/2008
> 8:12 PM
>