Re: [GRASS-user] MASK does not do it's work (?) with r.mapcalc -- Again!
Glynn: The mask is read as an integer map. If MASK is actually a floating-point map, the values will be converted to integers using the map's quantisation rules (this defaults to round-to-nearest, but can be changed with r.quant). Nikos Alexandris wrote: Thanks for the important clarification. Do you think it would be useful to add this information in the manual of r.mask? already added to the MASK section of the 2D-raster intro help page in 6.3svn. It makes some sense to add it to the r.mask help page too. H Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] No table after 'v.dissolve'
I'm trying to dissolve (on an integer column) a vector map. It works well but no table is created. The db.connect -p reports : driver:dbf database : ... /dbf/ schema : (null) group : (null) and the dbf/ subdirectory already exists in the mapset What's the problem ? Thank you, ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Variables in r.mapcalc other than raster?
Hi, thanks to all for help! As recommended in the manual, I put single quotes around my expressions and got invalid map for any no-map variables. Using double quotes instead solved the problem. - Sometimes it is rather simple... Best regards, Roland ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[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
RE: [GRASS-user] Use of r.watershed
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/ [EMAIL PROTECTED], 309-255-2727 http://chuck.ehlschlaeger.info/ -Original Message- From: [EMAIL PROTECTED] [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 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. Checked by AVG Free Edition. 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 ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
RE: [GRASS-user] MASK does not do it's work (?) with r.mapcalc --Again!
Nikos Alexandris wrote: Thanks for the important clarification. Do you think it would be useful to add this information in the manual of r.mask? already added to the MASK section of the 2D-raster intro help page in 6.3svn. It makes some sense to add it to the r.mask help page too. H r.mask help page updated in svn trunk and grass63_release branch. ~ Eric. ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
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=400 ac=fac ba=basins st=str I have also tried using the -m and -4 flags placed after the r.watershed part. Thanks, Matt Quoting Charles Ehlschlaeger [EMAIL PROTECTED]: 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/ [EMAIL PROTECTED], 309-255-2727 http://chuck.ehlschlaeger.info/ -Original Message- From: [EMAIL PROTECTED] [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 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. Checked by AVG Free Edition. 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 ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
RE: [GRASS-user] MASK does not do it's work (?) with r.mapcalc --Again!
Folks, (with all the respect) the GRASS community is a phenomenon! Cheers, Nikos. On Wed, 2008-01-23 at 09:24 -0500, Patton, Eric wrote: Nikos Alexandris wrote: Thanks for the important clarification. Do you think it would be useful to add this information in the manual of r.mask? already added to the MASK section of the 2D-raster intro help page in 6.3svn. It makes some sense to add it to the r.mask help page too. H r.mask help page updated in svn trunk and grass63_release branch. ~ Eric. -- Nikos Alexandris . Department of Remote Sensing Landscape Information Systems Faculty of Forestry Environmental Sciences, Albert-Ludwigs-University Freiburg . Tel. +49 (0) 761 203 3697 / Fax. +49 (0) 761 203 3701 / Skype: Nikos.Alexandris . Address: Tennenbacher str. 4, D-79106 Freiburg i. Br., Germany signature.asc Description: This is a digitally signed message part ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
RE: [GRASS-user] Use of r.watershed
Thanks. I will try and change my threshold value this evening. A little background, I have completed this phase of the project at work using ArcHydro and it took about half a day total to run through the tools (fill, flow direction, flow accumulation, etc.). I am trying to now do the same project at home using open source tools as a means of learning grass and as a comparison. I wonder if the r.watershed algorithms differ enough from the ArcHydro ones to make execution times very different? Any thoughts? Quoting Charles Ehlschlaeger [EMAIL PROTECTED]: r.watershed will take a long time for a 8,600x10,300 cell DEM under any circumstance. Your threshold value (400) might also be slowing things down. How large should your smallest exterior watershed basin be? If your grid cells are 10mx10m, your basins will be 400x10mx10m = 40,000 m^2: not that large. The larger the th value, the faster the program will run. Sincerely, chuck Chuck Ehlschlaeger, Geospatial Science Consultant PERTAN GROUP, http://pertan.com/ [EMAIL PROTECTED], 309-255-2727 http://chuck.ehlschlaeger.info/ -Original 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 rows and 10,270 columns. The command line statement I used is: r.watershed el=fill th=400 ac=fac ba=basins st=str I have also tried using the -m and -4 flags placed after the r.watershed part. Thanks, Matt Quoting Charles Ehlschlaeger [EMAIL PROTECTED]: 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/ [EMAIL PROTECTED], 309-255-2727 http://chuck.ehlschlaeger.info/ -Original Message- From: [EMAIL PROTECTED] [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 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. Checked by AVG Free Edition. 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 ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user No virus found in this incoming message. Checked by AVG Free Edition. 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 ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Use of r.watershed
Markus, 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 [EMAIL PROTECTED]: Matt, please also post to the list which GRASS version on which operating system you use. Markus On Jan 23, 2008 3:51 PM, [EMAIL PROTECTED] wrote: 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=400 ac=fac ba=basins st=str I have also tried using the -m and -4 flags placed after the r.watershed part. Thanks, Matt Quoting Charles Ehlschlaeger [EMAIL PROTECTED]: 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/ [EMAIL PROTECTED], 309-255-2727 http://chuck.ehlschlaeger.info/ -Original Message- From: [EMAIL PROTECTED] [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 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. Checked by AVG Free Edition. 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 ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user -- Open Source Geospatial Foundation http://www.osgeo.org/ http://www.grassbook.org/ ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Collapsing many layers into 1
My problem is a little different. I have just one map, but many layers. I want to get one map, with just one layer. On Tue, 2008-01-22 at 10:58 +0100, Martin Landa wrote: Hi, 2008/1/22, Neil Godfrey [EMAIL PROTECTED]: The census 2000 administrative boundaries are shapefiles, where every county is a separate file. So v.in.ogr creates a layer for every county. So for example, I get 83 layers for the 83 counties in Michigan, which correspond to 83 tables, each with just one category. What I want is one layer with 83 categories. I've had no luck with v.overlay, v.extract, v.patch, etc. because all those tools preserve the layers in the output map. Is there any way to do this? If the attribute tables have the same structure (number of columns, data types and key column), you can patch maps using v.patch -e in=`g.mlist vect pat='con*' out=con_patch v.clean in=con_patch out=con_clean tool=snap,break,rmdupl thresh=[value] ? Martin ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Use of r.watershed
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 r.terraflow and compare the differences between ArcHydro, r.terrafow and r.watershed. If anyone has used r.watershed on a comparably sized DEM, I would be interested to hear how long it took to run. By the way my machine has a 2.8Ghz P4 processor and 1.25G of RAM. Quoting M S [EMAIL PROTECTED]: If you are in a relatively flat area, there needs to be consideration given to the algorithm (to my knowledge there is no choice in the ArcGIS suite) used to do the most important thing: delineate the watershed basin. Since the question was asked about differences, this may apply if your terrain is relatively flat. From the r.watershed manual, If watershed divides contain flat to low slope, *r.watershed* will generate better basin results than *r.terraflow*. (*r.terraflow* uses the same type of algorithm as ESRI's ArcGIS watershed software which fails under these conditions.) http://download.osgeo.org/grass/grass63/manuals/html63_user/r.watershed.html Mark On Jan 23, 2008 11:42 AM, [EMAIL PROTECTED] wrote: Thanks. I will try and change my threshold value this evening. A little background, I have completed this phase of the project at work using ArcHydro and it took about half a day total to run through the tools (fill, flow direction, flow accumulation, etc.). I am trying to now do the same project at home using open source tools as a means of learning grass and as a comparison. I wonder if the r.watershed algorithms differ enough from the ArcHydro ones to make execution times very different? Any thoughts? Quoting Charles Ehlschlaeger [EMAIL PROTECTED]: r.watershed will take a long time for a 8,600x10,300 cell DEM under any circumstance. Your threshold value (400) might also be slowing things down. How large should your smallest exterior watershed basin be? If your grid cells are 10mx10m, your basins will be 400x10mx10m = 40,000 m^2: not that large. The larger the th value, the faster the program will run. Sincerely, chuck Chuck Ehlschlaeger, Geospatial Science Consultant PERTAN GROUP, http://pertan.com/ [EMAIL PROTECTED], 309-255-2727 http://chuck.ehlschlaeger.info/ -Original 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 rows and 10,270 columns. The command line statement I used is: r.watershed el=fill th=400 ac=fac ba=basins st=str I have also tried using the -m and -4 flags placed after the r.watershed part. Thanks, Matt Quoting Charles Ehlschlaeger [EMAIL PROTECTED]: 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/ [EMAIL PROTECTED], 309-255-2727 http://chuck.ehlschlaeger.info/ -Original Message- From: [EMAIL PROTECTED] [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 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. Checked by AVG Free Edition. 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 ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.19.9/1238 - Release Date: 1/22/2008 8:12 PM No virus found in this outgoing
Re: [GRASS-user] Collapsing many layers into 1
Hi,
2008/1/23, Neil Godfrey [EMAIL PROTECTED]:
My problem is a little different. I have just one map, but many layers.
I want to get one map, with just one layer.
you can use `v.category chlayer=` to change layer number, but it will
not touch attribute data.
v.category in=map out=map_1 chlayer=2,1,3,1,4,1
You can also extract layers to single-layer vector maps and the to patch them.
for layer in `seq 2 10`; do
v.extract in=map out=map_${layer} layer=$layer where=cat0;
done
v.patch in=`g.mlist vect pat=map_*` out=map_patch -e
v.clean ...
Martin
On Tue, 2008-01-22 at 10:58 +0100, Martin Landa wrote:
Hi,
2008/1/22, Neil Godfrey [EMAIL PROTECTED]:
The census 2000 administrative boundaries are shapefiles, where every
county is a separate file. So v.in.ogr creates a layer for every
county. So for example, I get 83 layers for the 83 counties in
Michigan, which correspond to 83 tables, each with just one category.
What I want is one layer with 83 categories. I've had no luck with
v.overlay, v.extract, v.patch, etc. because all those tools preserve the
layers in the output map.
Is there any way to do this?
If the attribute tables have the same structure (number of columns,
data types and key column), you can patch maps using
v.patch -e in=`g.mlist vect pat='con*' out=con_patch
v.clean in=con_patch out=con_clean tool=snap,break,rmdupl thresh=[value]
?
Martin
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Re: [GRASS-user] Collapsing many layers into 1
Hi, 2008/1/23, Martin Landa [EMAIL PROTECTED]: v.category in=map out=map_1 chlayer=2,1,3,1,4,1 ops, sorry, of course v.category in=map out=map_1 opt=chlayer layer=2,1,3,1,4,1 Martin -- Martin Landa [EMAIL PROTECTED] * http://gama.fsv.cvut.cz/~landa * ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Use of r.watershed
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 r.terraflow and compare the differences between ArcHydro, r.terrafow and r.watershed. see also here for some comparison: http://www.cs.duke.edu/geo*/terraflow/speedup.html Markus ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] clipping point with poly
Dear all, I would like to know how to clip a point vector layer using a polygon vector layer with grass62. Thanks -- Cordialement Emmanuel Poizot Cnam/Intechmer B.P. 324 50103 Cherbourg Cedex Phone (Direct) : (00 33)(0)233887342 Fax : (00 33)(0)233887339 begin:vcard fn:Emmanuel Poizot n:Poizot;Emmanuel org:Cnam;Intechmer adr:;;B.P. 324;Cherbourg;;50103;France email;internet:[EMAIL PROTECTED] title;quoted-printable:Ing=C3=A9nieur d'Etudes tel;work:(0033)(0)233887342 tel;fax:(0033)(0)233887339 x-mozilla-html:FALSE url:http://www.intechmer.cnam.fr version:2.1 end:vcard ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Use of r.watershed
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 something different- sink-watersheds not catchment watersheds. see http://thread.gmane.org/gmane.comp.gis.grass.user/21564/focus=21579 But r.terraflow should run in minutes. If anyone has used r.watershed on a comparably sized DEM, I would be interested to hear how long it took to run. By the way my machine has a 2.8Ghz P4 processor and 1.25G of RAM. Yes I have run on something that size, and bigger. It could take up to two days to complete, but it gets there with nice results. I usually set it up to run on a friday afternoon and it's done by the time I get back on monday. Setting the process priority low (ie high renice value) helps if you leave it running during the week. To get started, you might try the examples given for the Spearfish dataset in the help page and on the wiki, http://download.osgeo.org/grass/grass63/manuals/html63_user/r.watershed.html (help page home is in transition- broken link right now) http://grass.gdf-hannover.de/wiki/Psmap_flooding_example Hamish Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] clipping point with poly
Poizot Emmanuel wrote: I would like to know how to clip a point vector layer using a polygon vector layer with grass62. v.select or v.overlay Hamish Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Use of r.watershed
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 proved to be a terrible bottleneck. The r.watershed in newer versions of GRASS can be much much faster. Hamish Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
