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<p style="margin-bottom:0in;line-height:100%">Hi,</p>
<p style="margin-bottom:0in;line-height:100%">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.</p><br>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.<br><br>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!<br><br>I have been
programming in R for so many years my python has deteriorated to
nothing…..<br>regards,
<p style="margin-bottom:0in;line-height:100%">Phil</p>
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