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Section 16.5.2, “Geometry Functions”, discusses several functions that construct new geometries from existing ones. See that section for descriptions of these functions:
Geometry
Envelope(g)
g
StartPoint(ls)
ls
EndPoint(ls)
PointN(ls,N)
N
ExteriorRing(poly)
poly
InteriorRingN(poly,N)
GeometryN(gc,N)
gc
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