[GRASS-user] Non-Topological Vector Polygon Layer From r.water.outlet

[Phillip Allen]

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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