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Does anyone know if there is an open source project in Java that will take a set of (x, y, z) points and create a contour map for Google Maps/Earth?

There does not seem to be a good contouring application for Google Maps. Any suggestions?

Thx!

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Does it have to be accomplished with Java? If not, I have a Civil 3D solution. –  Dano Apr 26 '11 at 18:54
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Google search turns up jzy3d. It looks like it creates a TIN-like surface, which is ideal for (x,y,z) points. I haven't used it, which is why this is a comment and not a reply :-). –  whuber Apr 26 '11 at 19:43
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2 Answers

JAI-Tools (http://code.google.com/p/jai-tools/) has a contour operation. I'm not sure if it will handle point input or requires a raster DEM.

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GDAL has a Java API available at http://gdal.org/java/ To use it, you would probably need to create a raster file with gdal_grid and then create the contours with gdal_contour. I don't think you will be able to create a proper triangulated irregular network (TIN) directly from the points, but the dem may be accurate enough for your needs.

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