PostGIS
2.2.8dev-r@@SVN_REVISION@@
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PG_FUNCTION_INFO_V1()
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PG_FUNCTION_INFO_V1
(
LWGEOM_interiorringn_polygon
)
InteriorRingN(GEOMETRY) – find the first polygon in GEOMETRY, Index is 1-based.
Returns
its Nth interior ring (as a linestring). Return NULL if there is no POLYGON(..) in (first level of) GEOMETRY.
postgis
lwgeom_ogc.c
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