Hei Doug,

not sure if this hint helps since Martin wrote that your coverage seems to have overlaps. However, I just recently added to OpenJUMP source code a function to simplify polygonal tesseleations: see Tools/Generalization/Simplify Polygon Coverage It does more or less what Martin describes: extracting the common edges, simplify those, and polygonize them again.

Unfortunately we have a problem with the nightly built of OpenJUMP .. so you need to pull the last code via SVN.

I hope this helps a bit
stefan

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