v.in.region + v.overlay to do the inversion. H
--- On Thu, 4/19/12, Markus Neteler <[email protected]> wrote: > From: Markus Neteler <[email protected]> > Subject: Re: [GRASS-user] internal buffer of polygon > To: "Milton Cezar Ribeiro" <[email protected]> > Cc: "GRASS user list" <[email protected]> > Date: Thursday, April 19, 2012, 9:17 AM > Hi all, > > does anyone have a new(er) trick for negative vector buffers > (in GRASS 7)? > > thanks > Markus > > On Thu, Oct 29, 2009 at 4:59 PM, Milton Cezar Ribeiro > <[email protected]> > wrote: > > Hi Maning, > > > > Sometimes I have the same issue, but I don't solve this > on vector. > > Just supose you have a map where 1 is your > raster-based-polygon > > and NULL is outside of polygon. You can use r.mapcalc > to > > invert it, in the maner that 1 come to be your > non-polygon, and > > NULL your polygon. So you can run r.buffer with > positive value > > and at the end may be you need to do some kind of > crossing > > between original and output maps. > > > > Bests. > > > > miltinho > > > > 2009/10/29 maning sambale <[email protected]> > >> > >> I tried using a negative values as > >> buffer=-3000 in v.buffer but it doesn't give me > internal buffer in a > >> polygon layer. > >> > >> Any hints? > >> > >> -- > >> cheers, > >> maning > >> > ------------------------------------------------------ > >> "Freedom is still the most radical idea of all" > -N.Branden > >> wiki: http://esambale.wikispaces.com/ > >> blog: http://epsg4253.wordpress.com/ > >> > ------------------------------------------------------ > >> _______________________________________________ > >> grass-user mailing list > >> [email protected] > >> http://lists.osgeo.org/mailman/listinfo/grass-user > > > > > > > > _______________________________________________ > > grass-user mailing list > > [email protected] > > http://lists.osgeo.org/mailman/listinfo/grass-user > > > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user > _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
