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(1) abstract geometry; (2) storing geographic data in projected coordinates; (3) a generic ESRI term for vector features; a class for "geometry" objects.
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PostGIS: Correct way of using ST_Union/ST_Difference with or without gridsize
I will use example (brown - user drawn area, light blue - postal code)
I found that when user draws some area, selects a postal code and then deselects it, the output geometry isn't the same as if he …