Darren Cope ha scritto: > Hi Markus and list, > > - I'm using GRASS 6.3.cvs (2006) underQGIS (using the > qgis_setup0.8.1preview3.exe installer from: > http://qgis.org/uploadfiles/testbuilds/) in a Windows 2000 > environment. I've installed qgis in a directory (C:\QGIS) with no > spaces or path names over 8 characters > - the data I downloaded is from the geographynetwork.ca website, and > comes in shapefile format > - Created a new mapset in GRASS (using QGIS GUI) > - Added shapefile to QGIS project > - import shapefile to GRASS vector using v.in.ogr using QGIS "GRASS > Tools" > - run v.clean as per CORINE example (v.clean input=wateroriginal > output=waterclean tool=rmdupl) in GRASS shell > - at this point I noticed that the attribute values are not carried > through and I'm left with only "id" and "cat" - why is this, and will > it cause problems later on? See the output message of v.in.ogr, maybe there is some problems in the structure of the input table > - run v.dissolve (v.dissolve input=waterclean output=waterdissolve) in > GRASS shell, result is a non-dissolved file - I didn't specify a > category, but I'm only doing a "spatial" dissolve, so is this > necessary? I see this bug with v.dissolve that is present only in grass 6.3 > - I also tried v.extract -d (v.extract -d input=waterclean > output=waterextract) in the GRASS shell without success Here you must specify the category list that you want extract or a query
Ciao leonardo > > Hopefully I'm missing something obvious! Any help would be appreciated. > > Cheers, > > Darren > > On 5/28/07, Markus Neteler <[EMAIL PROTECTED]> wrote: >> Darren, >> >> could you be more specific about what you did (commands + flags/params), >> which GRASS version etc? I just used this method recently again with >> success. >> The v.patch step in the CORINE example is necessary for *CORINE* since >> you get vector tiles. If you have already a patched map, don't use it. >> >> Markus >> >> Darren Cope wrote on 05/28/2007 02:01 PM: >> > Hi Markus, >> > >> > I must be missing something, because this still does not seem to work. >> > I found another (non-GRASS) way to accomplish this, so the priority >> > is not very high, but I'd still like to figure out the GRASS method. >> > Is the v.patch step in the CORINE example necessary, or mostly just >> > the v.clean step with rmdupl? >> > >> > Cheers, >> > >> > Darren >> > >> > On 5/16/07, Markus Neteler <[EMAIL PROTECTED]> wrote: >> >> >> >> Hi Darren, >> >> >> >> I also stumbled over this problem, but we solved it. The trick is >> that >> >> you first have to remove the duplicated tile boundaries, then >> dissolve >> >> works. >> >> See example for CORINE Landcover SHAPE files: >> >> http://grass.itc.it/grass63/manuals/html63_user/v.dissolve.html >> >> >> >> Cheers >> >> Markus >> >> >> >> >> >> Darren Cope wrote: >> >> > >> >> > Hi all, >> >> > >> >> > I'm new to GRASS, and using it in Windows via QGIS. >> >> > >> >> > I am attempting to do a "spatial dissolve" (i.e. not dissolve on an >> >> > attribute, but rather just remove unnecessary tile boundaries) on a >> >> > file that I've imported to GRASS from a shapefile, and am so far >> >> > unsuccessful. The file contains waterbodies, and some of them >> are cut >> >> > in pieces by tile boundaries. I would like to remove these >> >> > boundaries. Can someone please help me out? I've tried >> combinations >> >> > of v.extract -d with no success, and am not sure how the "category" >> >> > value apply when I'm not dissolving on an attribute. >> >> > >> >> > So far my search of the archives has turned up something close, but >> >> > nothing that seems to fit my situation exactly. >> >> > >> >> > Cheers, >> >> > >> >> > Darren Cope >> >> > [EMAIL PROTECTED] >> >> > http://dmcope.freeshell.org >> >> >> ------------------ >> ITC -> dall'1 marzo 2007 Fondazione Bruno Kessler >> ITC -> since 1 March 2007 Fondazione Bruno Kessler >> ------------------ >> >> _______________________________________________ >> grassuser mailing list >> [email protected] >> http://grass.itc.it/mailman/listinfo/grassuser >> > > _______________________________________________ grassuser mailing list [email protected] http://grass.itc.it/mailman/listinfo/grassuser
