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! I have been programming in R for so many years my python has deteriorated to nothing….. regards, Phil
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