PolygonSplit Operator | Geospatial Data Types | Teradata Vantage - 17.05 - PolygonSplit - Teradata Database

Teradata Vantageā„¢ - Geospatial Data Types

Advanced SQL Engine
Teradata Database
June 2020
Programming Reference

Table operator that accepts a table containing ST_Geometry Polygon types and recursively processes qualifying polygons into sets of smaller sub-polygons, each having fewer vertices than the original polygon. Taken together, the sub-polygons closely approximate the shape and area of the original polygon.

If the input polygon exceeds a specified maximum number of vertices, PolygonSplit divides the polygon into four sub-polygons, one occupying each quadrant of the input polygon. The sub-polygons thus formed are similarly, recursively split until each resulting polygon has fewer than the specified maximum number of vertices.

The input table must include an ST_Geometry column to hold a polygon and an identifier column to hold a unique identifier for each polygon. The sub-polygons that are created all share the identifier of the original polygon that was split.