Le Wed, 26 Oct 2016 08:37:38 -0600, Phillip Allen <[email protected]> a écrit :
> Hi, > > I have a point layer file that represents stream sediment sample > locations. My goal is to create watershed basins for each sample > location using r.water.outlet or r.stream.basins, then convert to a > vector layer and finally have them reside in a PostGIS table with all > the other associated sample data. I have run the points through > r.stream.snap so they now fall exactly only the DEM drainage. > > Grass normally operates with topology but in this case I need a > non-topological vector polygon layer. Stream sediment samples are > often collected every 1-5km or more along any particular drainage so > the basins must overlap. > > What is the best strategy to deal with generating an overlapping > polygon layer? I have only approximately 10,000 stream sediment > samples this time but there are always more! See Markus Metz' answer in a similar thread from two days ago: http://lists.osgeo.org/pipermail/grass-user/2016-October/075475.html As in his message: it is possible to handle overlapping polygons using cat numbers, but the first question is: what do you want to do with the data ? Moritz _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
