A couple of things:
You might also try looking at the Net Topology Suite, which is a port of
JTS to C# (just like GEOS is a port to C++). HOWEVER, this is a fork of
JTS, and I don't know how current or active it is. (It might be nice
thing for JTS to offer an official .NET compatible version....)
You can also try compiling JTS under J#. It mostly all works - there
might be a few simple utility classes you have to supply.
As for your topology problems, this might be cause by invalid input
data, or it might be caused by robustness errors in the computation
itself. The most recent version of GEOS has some substantial
improvements in robustness for overlay ops, so you should try it and see
if it fixes your problem. (At a very high level this is doing something
similar to your concept of "cleaning up" the geometries to avoid the
problems - but it's probably not something you want to try at home 8^)
Another note - if you are unioning many polygons together, JTS is just
adding an optimized function to do this efficiently, and hopefully this
will make it in GEOS in due course.
Simon Perkins wrote:
Hi,
Are there any C# bindings for GEOS out there?
We've been using the OGR interface to GEOS (which are exposed by the
OGR C# bindings), but are running into some strange topology
exceptions (side location conflicts and non-nodal intersections) and
I'd like to use the GEOS isValid() method which is not exposed by OGR,
AFAIK. Might using the GEOS library directly be more efficient than
going through OGR as well?
In general, is there an easy way to "clean up" a geometry so it won't
raise these kinds of exceptions? The geometries in question are all
generated by the union of (many) simple polygons.
Anyway, I could go off and roll PInvoke stubs for the GEOS functions I
need in not much time, but I figured I'd see what other people have
already before I do that. Any interest in adding such bindings to
geos? I could also take a look at SWIG, but it always scares me for
some reason...
Cheers,
Sy
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Martin Davis
Senior Technical Architect
Refractions Research, Inc.
(250) 383-3022
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