Thanks Even. Whether this algorithm internally use Convex Hull or Concave Hull? How to get Concave Hull-based union geometry using GDAL? Are these functionalities (ogr.CreateGeometryFromWkt..) available with C# bindings? Regards, Rajesh -- Sent from: http://osgeo-org.1560.x6.nabble.com/GDAL-Dev-f3742093.html