Does anybody know if there is a way to statistical calculate the similarity of two polygons using PostGIS?

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I want to know how similar is the polygon (red outline) with the polygon (black outline).

  • Questions asking for "any ideas?" without specifying the particular software you have tried, are stuck on and wish to ask about are too broad. The PostGIS answer now makes this a PostGIS Q&A so if you wish to know about another particular question then can you ask a new question, please? – PolyGeo Aug 25 '17 at 18:12
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    I have tried to develop my own similarity index using intersection and symmetrical difference in QGIS. Unfortunately i havent succeed. I was thinking, perhaps there is already a tool to assess the similarity. I havent tried this in postgis. – geoDIY Aug 25 '17 at 20:42
  • If you want to pursue the same thing using QGIS then please ask that as a new question for QGIS. – PolyGeo Aug 25 '17 at 22:46

Have a look at the PostGIS function - ST_HausdorffDistance


This is a measure of how similar or dissimilar two shapes are.

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