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There are dozens
of things that I could go into, but I suppose hte most important question
is:
Which line
thinning algorithm are you using?
Without knowing
more about that, I would try thinning lines using the Douglas-Peucker algorithm (and I really don't understand why anyone
would use anything else). I've written a tool to do this, and I'm sure others
have as well. Start by using the raster grid size (i.e. the
size of a pixel projected onto the Earth) as the tolerance. You can
increase the tolerance further, to generalize to maps at larger
scales.
Hope this
helps
Spencer
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Morrier, Steve Sent: Monday, November 21, 2005 3:14 PM To: [email protected] Subject: [MI-L] Intelligent Node Thinning Hi All,
Does anyone know of a tool that will do intelligent
node thinning? We have extracted a large number of forest blocks from 75cm
aerial photography using a spectral classification. The classification produces
a very "stepped" looking polygon with far too many nodes/points. I would like to
run a combination of smooth and generalize on the polygons. The problem is the
smooth seems to add more nodes and the generalize ends up really altering the
shape of the polygon. It would be nice to be able to specify an angle and a
distance that you could choose to keep or drop nodes based on the angle to the
next node and the distance. Does anything like this exist? Thanks very
much.
Steve
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