17.05 - Usage Notes - Teradata Database

Teradata Vantage™ - Geospatial Data Types

Advanced SQL Engine
Teradata Database
June 2020
Programming Reference

The boundary of an ST_Geometry value is a set of ST_Geometry values of the next lower dimension.

IF the ST_Geometry represents … THEN the boundary …
an ST_Point or ST_MulitPoint value is the empty set.
a nonclosed ST_LineString or GeoSequence value consists of the start and end ST_Point values.
a closed ST_LineString or GeoSequence value is empty.
an ST_MultiLineString value consists of ST_Point values that are in the boundaries of an odd number of its element ST_LineString values.
an ST_Polygon value consists of its set of linear rings.
an ST_MultiPolygon value consists of the set of linear rings of its ST_Polygon values.
an ST_GeomCollection where the interiors of the geometries in the collection are disjoint consists of geometry values drawn from the boundaries of the element geometries, where the geometry values are in the boundaries of an odd number of element geometries.