Section 17.5.2, “Geometry Functions”, discusses
several functions that construct new geometries from existing
ones. See that section for descriptions of these functions:
Envelope(
g)
StartPoint(
ls)
EndPoint(
ls)
PointN(
ls,N)
ExteriorRing(
poly)
InteriorRingN(
poly,N)
GeometryN(
gc,N)

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