Usage Notes

Teradata Vantageā„¢ Geospatial Data Types

prodname
Teradata Database
Teradata Vantage NewSQL Engine
vrm_release
16.20
category
Programming Reference
featnum
B035-1181-162K
  • The ST_IsValid method can be used to validate converted 2D geometries that were not validated by Make_2D.
  • If the input geometry is already a 2D geometry value, this value is returned unchanged by this method.
  • A well-formed 3D geometry value can become invalid during a 3D to 2D conversion. For example, if a 3D polygon lies in a plane parallel to the y axis, its line segments will self-intersect. Make_2D does not attempt to change the geometry type of the converted geometry from polygon to linestring to account for this, and an invalid 2D geometry can result.