I was wondering if anyone knew where I could find some good test cases for a
project I am working on. I've done a few web searches, but have pretty much
struck out and though that somebody on this list might have some ideas.
I am working on a series of Java-based Triangulated Irregular Network (TIN)
tools that I would eventually like to contribute to GeoTools. They represent a
substantial improvement in terms of speed over the existing
DelaunayTriangulator class currently available as part of GeoTools (a Delaunay
mesh is a particular kind of TIN that is optimized using the Delaunay
criterion). Eventually, I plan on adding support for breaklines, DEM
generation, etc., features that I think would make a nice addition to GeoTools.
One of the critical issues in Delaunay meshes is how they handle problematic
data. While I have lots of test data in the form of Lidar samples (which are
easy to come by nowadays), I am looking for a different kind of test.
Sometimes the geometry of neighboring points is such that an algorithm fails
due to numeric calculation issues. For example, a set of sample points that
results in a triangle of nearly zero area is often a problem. I'm looking for
data sets that I can use to torture my logic and make sure it holds up given
difficult geometries. The ideal test cases would feature a small number of
points (so I can debug the thing).
Does anyone know of a set of test data that might be suitable to this problem?
Thanks.
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Gary W. Lucas, Software Engineer
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