I encountered following problems with Intersection by using Grass's v.overlay.
I used 2 vector area maps to create a new map through intersection (or option
used).
The number of new polygonal areas of the output each time is different.
Inconsistent output.
I kept encountering Error 6: Failed to add field named 'a_testnumber'.
Can anyone shed some light on this?
Regards,
David
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