I tried to use PostGIS's ST_ApproximateMedialAxis to convert a long skinny area in into a line, but the results weren't very good. Here's the script if anyone's interested

gist.github.com/amandasaurus/1

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One big problem is that the output geometry that this PostGIS function generates is weird and funny, and no very suitable for direct use in . There's lots of little ways, and the direction changes a lot.

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