[gdal-dev] layer union returns a geometry collection

[Matthew Snape]

Hello,

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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