On Wed, 2008-03-19 at 12:12 -0700, John C. Tull wrote: > On Mar 19, 2008, at 11:08 AM, Nikos Alexandris wrote: > >> John, > >> > >> maybe you could try > >> > >> v.clean with type=line,boundary,centroid,area tool=snap,break,rmdupl > >> thresh=.01 > >> > >> Not sure but I suspect the "break" tool is what you might need. > > > > And then of course the rest with v.centroids > > > > Nikos, > > Thanks for the suggestion. I seem to be getting closer. I ran v.clean > as you suggested, then ran v.clean with tool=chdangle and a really big > threshold value. Ah.. ok!
> Now many more areas are available, but there are > still quite a few apparently closed polygons that are not being picked > up as areas. I'm playing around with different thresholds for snap and > various permutations of the various operations. So, if I understand, the idea is: lines to boundaries (v.type) > snap (close open boundaries) + chdangle (dangles from boundary to line) > v.centroids Maybe I misunderstood the "break" tool here. I thought it would help but maybe it's irrelevant (?) If it's not too much work could you copy-paste your commands (if successful)? Thank you, Nikos _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
