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The simple approach is to loop through each polygon, filter the remaining polygons by the spatial extent of the polygon (plus a little buffer), and then run your adjacency test. If your polygons are going to be of the "Simple Feature" variety, i.e. you aren't using a topological data model, you'll need to consider how you define adjacency in terms of ...


As seen in the comments, it was a bug. You can see the bug in the bugtracker. It was fixed in the 2.1.2 release However, being caught by that bug outlined a fundamental issue in our design, and made it possible to realize that the app would not be performing well using such a generic type. I would not advise to use GeometryCollections unless you know ...

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