Divide a single polygon (with several outer-contour components) into
several polygons, a polygon for each outer contour, by modifying the
PolySet with one or more polygons, each with possibly several components/holes.
Given the input PolySet, this function renumbers the
SID indices so that each outer contour has a unique PID and
is followed by all of its holes, identifying them with
greater than one.
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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