Re: [GRASS-user] v.generalize for area boundaries?
On Tue, Feb 17, 2009 at 7:35 AM, Hamish hamis...@yahoo.com wrote: Hi, I am following the v.generalize tutorial at http://users.ox.ac.uk/~orie1848/tutorial.html (we should move that to the wiki before it disappears) Here are converters to Mediawiki syntax: http://www.jtidy.de/ http://diberri.dyndns.org/wikipedia/html2wiki/index.html Additionally, the screenshots need to be uploaded. Markus ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] v.generalize for area boundaries?
On 17.02.2009 08:35, Hamish wrote: Hi, I am following the v.generalize tutorial at http://users.ox.ac.uk/~orie1848/tutorial.html (we should move that to the wiki before it disappears) but it doesn't say much about working with areas beyond removing small ones. That page and the images exists in the svn too. How does one go about adding extra manual pages? Or perhaps we could integrate it into the manual page itself? I have a vector area which has a very steppy boundary, like from r.to.vect with a sawtooth pattern at the cell edges. I want to run a smoothing filter over it to get rid of the jaggy bits. No matter what method I try my output map is always the same as the input map, no vertices are created or destroyed. any ideas how to do this? I know about 'v.clean tool=prune' and Markus Metz's topology-preserving v.simplify (psst- add it to wiki addons) but I'd like to learn more about how to use v.generalize. How large is the cell you exported from? First you have to use a smoothing operator. When you are done with the smoothing you should use the douglas method to reduce the number of points. I'll see if I can whip up an example for you. --Wolf -- :3 ) Wolf Bergenheim ( 8: ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] v.generalize for area boundaries?
Hi, Is it possible with grass to replace missing values in a map by surrounding values by a sort of interpolation, knowing that sometimes many missing values are numerous one near another? If yes, how? Thank you very much Stéphanie ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] v.generalize for area boundaries?
Hi.. please try r.neighbors cheers.. Ivan Il giorno mar, 17/02/2009 alle 18.00 +0100, FAROUX STEPHANIE ha scritto: Hi, Is it possible with grass to replace missing values in a map by surrounding values by a sort of interpolation, knowing that sometimes many missing values are numerous one near another? If yes, how? Thank you very much Stéphanie ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user -- Ti prego di cercare di non inviarmi files .dwg, .doc, .xls, .ppt. Preferisco formati liberi. Please try to avoid to send me .dwg, .doc, .xls, .ppt files. I prefer free formats. http://it.wikipedia.org/wiki/Formato_aperto http://en.wikipedia.org/wiki/Open_format Ivan Marchesini Department of Civil and Environmental Engineering University of Perugia Via G. Duranti 93/a 06125 Perugia (Italy) Socio fondatore GFOSS Geospatial Free and Open Source Software http://www.gfoss.it e-mail: marches...@unipg.it ivan.marches...@gmail.com tel: +39(0)755853760 fax (university): +39(0)755853756 fax (home): +39(0)5782830887 jabber: geoiva...@jabber.org ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] v.generalize for area boundaries?
On Tue, Feb 17, 2009 at 7:03 PM, ivan marchesini marches...@unipg.it wrote: Hi.. please try r.neighbors r.fillnulls is another option: http://grass.osgeo.org/grass64/manuals/html64_user/r.fillnulls.html Markus cheers.. Ivan Il giorno mar, 17/02/2009 alle 18.00 +0100, FAROUX STEPHANIE ha scritto: Hi, Is it possible with grass to replace missing values in a map by surrounding values by a sort of interpolation, knowing that sometimes many missing values are numerous one near another? If yes, how? Thank you very much Stéphanie ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] v.generalize for area boundaries?
Hi, I am following the v.generalize tutorial at http://users.ox.ac.uk/~orie1848/tutorial.html (we should move that to the wiki before it disappears) but it doesn't say much about working with areas beyond removing small ones. I have a vector area which has a very steppy boundary, like from r.to.vect with a sawtooth pattern at the cell edges. I want to run a smoothing filter over it to get rid of the jaggy bits. No matter what method I try my output map is always the same as the input map, no vertices are created or destroyed. any ideas how to do this? I know about 'v.clean tool=prune' and Markus Metz's topology-preserving v.simplify (psst- add it to wiki addons) but I'd like to learn more about how to use v.generalize. thanks, Hamish ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
