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Automatically extending polygons (municipalities) into maritime areas: possible?

Question asked by PSI_Research on Feb 1, 2012
Latest reply on Feb 9, 2012 by dlee-esristaff
I'd need to extend administrative areas that are along the coast, by a given distance, so that it becomes possible to assign point records off the coast to the corresponding municipality. I can of course create buffers and only retain those that are on the ocean side, but then I end up with a lot of overlapping polygons. Any way that these overlapping features (within the same layer) can be automatically processed in order to generate an appropriate boundary between each municipality's maritime "domain"?

I've attached an example of what I'd need to obtain.

Any help would be greatly appreciated!