Geospatial Table Operators (Teradata Database) - Teradata Warehouse Miner

Teradata® Warehouse Miner™ User Guide - Volume 2ADS Generation

Product
Teradata Warehouse Miner
Release Number
5.4.6
Published
November 2018
Language
English (United States)
Last Update
2018-12-07
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B035-2301
Product Category
Software

The following table lists the available Geospatial Table Operators, and a description of their purpose.

Table Operators: Geospatial
Operator Description
Polygon Split 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.