By following the rules from this site, I got the output but some polygons do not come within the simplified polygon. I think the problem is with topology.

Is there any solution?


  • 1
    what tolerance did you use for st_simplifyPreserveTopology – Ian Turton May 22 '19 at 13:49
  • I used the same 10000 meters for st_simplifypreserveTopology. And also I reduced that to 5000 and rechecked that but no improvement. – Karthik May 22 '19 at 13:55
  • I'd start at 500 and go from there - really depends on the projection and how big your map is – Ian Turton May 22 '19 at 13:58
  • I tried that now and got some improvement in orientation of lines but still the polygons are not simplified. – Karthik May 22 '19 at 14:18
  • 1
    then your tolerance is in degrees, so go with a very small number – Ian Turton May 23 '19 at 7:47

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