Hi, I have two polygons with following coordinates:
poly1: (13,0 13,20 23,20 23,0 13,0) poly 2: (23,20 23,28 30,28 30,20 23,20) Once generated concaveHull, i end up with the polygon having following coordinates: "POLYGON((13 3e-016,13 5.64256204109163,13 11.2851240821833,13 16.9276861232749,13 20,17.4061007032357 20,23 27.049761125177,23 28,28.6425620410916 28,30 28,30 22.3574379589084,30 20,23 14.674220666202,23 9.34844133240395,23 4.02266199860593,23 3e-016,17.3574379589084 3e-016,13 3e-016))" When investigating the coordinate list, it is observed that some existing edges are split. [Eg. edge connecting 13,0 and 13,20]. Why is taht? Here is the SQL code i used SELECT ST_AsText (ST_cleangeometry((ST_ConcaveHull(ST_Collect(geom), 0.99)))) FROM concavepoly WHERE cluster_id = 'VC-2'; Cheers, Brian
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