Combine several polygons into a single polygon by modifying the
PolySet with one or more polygons, each with possibly several components/holes.
This function accepts a PolySet containing one or more polygons
PIDs), each with one or more components or holes
SID column need not exist in the input.
The function combines these polygons into a single polygon by simply
SID indices. The resulting
PolySet contains a single
PID (with the value 1) and uses
SID value to differentiate between polygons, their
components, and holes.
PolySet, possibly with the addition of an
SID column if
it did not already exist. The function may also reorder columns such
first, in that order.
Nicholas M. Boers, Associate Professor – Computer Science
MacEwan University, Edmonton AB
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