18.5.3.1. Geometry Functions That Produce New Geometries
Section 18.5.2, “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)
