Hi, I have a problem. I'm trying to calculate the area of a great number of sites on a specific territory. The problem is that these sites can overlap (as they do very frequently) and I do not want to count the same portion of land twice. A st_union would work with this right? Unfortunately my experience with this function is that it is way too slow for the numerous polygons I would have to merge. As a matter fact it would take years. Does anybody know of a hack around this? (In PostGIS or ArcGIS)
Many thanks!
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