17.10 - Usage Notes - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - Geospatial Data Types

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1181-171K
Language
English (United States)
  • The first and last points in a polygon will be the same point.
  • A polygon consists of one exterior ring and zero or more interior rings. The interior rings must lie completely within the exterior ring. A MultiPolygon is a group of non-overlapping polygons.
  • The element ID of each point identifies which element the point belongs to in a Multi-type geometry. For example, for a MultiLineString that contains two LineStrings, the first LineString will be element 1 and the second LineString will be element 2.

    For non-Multi geometries, the element ID is always 1.

  • If an input geometry value is NULL, the corresponding output row that is returned will have NULLs in the geomType, x, y, and z columns.
  • Due to the hierarchical nature of the ID columns, you can use an ORDER BY clause to keep the rows associated with each passed-in geometry together, and grouped according to the sub-geometries of Multi types. See the example below.