On Tue, May 29, 2007 at 05:23:42PM +0200, Leonardo Lami wrote: > 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 don't think that it is a bug. If there are duplicated boundaries, v.dissolve must fail. (see also my other mail how to solve this) Markus > > - 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 _______________________________________________ grassuser mailing list [email protected] http://grass.itc.it/mailman/listinfo/grassuser
