The documentation(1) says "The result layer contains features whose geometries represent areas that are either in the input layer, in the method layer, or in both.". I assume you a polygon in the input layer B which has a common singular point and common area with a polygon in layer C.



On 12.02.2018 11:58, Matthew Snape wrote:


I am performing a union of two layers using OGR from Python…

layerA.Union(layerB, layerC,["PROMOTE_TO_MULTI=YES",])

This returns a layer composed of multipolygon’s  except for a single geometrycollection in the form…

GEOMETRYCOLLECTION (POINT (2610469.66 3325023.52),POLYGON ((2610439.3657 3325014.925899999……….

Is this expected behaviour, and if so what is it showing?

Any help appreciated

Thank you.

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