try temporarily increasing the region resolution by 2x for the r.to.vect step.
? Hamish --- On Tue, 29/9/09, achim <a...@jupiter.uni-freiburg.de> wrote: > From: achim <a...@jupiter.uni-freiburg.de> > Subject: [GRASS-user] serious problem with "ROUND-OFF" > To: "grass-user" <grass-user@lists.osgeo.org> > Received: Tuesday, 29 September, 2009, 11:01 PM > Hi all, > > I have a problem, I really would like to solve, because > many problems > occur in my theses in further steps. > > What I do is: > > 1. I break lines at some lengths. > 2. I use both vector- and raster-data for analysis, which > is eg. > updating points with raster-values or converting lines and > points to raster. > > The Problems are (due to rounding or "non-snapping"?): > !Points from lines on the edge between two diagonal cells > (see pictures)! > These points do: > 1. not belong precisely to one cell (compared with the line > they come > from (see picture v.to.rast.png) > 2. These points sometimes don't lie on on the cells, the > line is > referred to (see picture break.png) > > Any hints are very welcomed! > > Thanks in advance, > Achim > > -----Inline Attachment Follows----- > > _______________________________________________ > grass-user mailing list > grass-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/grass-user > _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user