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I am a beginner in the world of GIS.

I have one table polygons with each polygon having north-east and south-west coordinates. And for every polygon, I need to find area of overlap with other polygons (e.g. 70% area of polygon A overlaps with polygon B).

I know the ST_Intersects function, but it returns boolean. What other function that I can use with putting buffer as 70%?

If anybody could get me started, that would be great!

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    What technology are you using? SQL Server? PostGIS? Oracle? Desktop GIS of some sort?
    – Alex Leith
    Aug 28, 2015 at 10:35
  • @AlexLeith this question is tagged with PostGIS, so that would be a fair assumption.
    – Evil Genius
    Aug 28, 2015 at 10:48
  • @EvilGenius - ah, good point...
    – Alex Leith
    Aug 29, 2015 at 0:13

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ST_Intersection(geomA, geomB) returns a geometry, then calculate areas with ST_Area.

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