7.00.02 - GeometryOverlay Arguments - Aster Analytics

Teradata Aster® Analytics Foundation User GuideUpdate 2

Product
Aster Analytics
Release Number
7.00.02
Release Date
September 2017
Content Type
Programming Reference
User Guide
Publication ID
B700-1022-700K
Language
English (United States)
SourceLocationColumn
Specifies the name of the source table column that contains the polygon description in WKT format.
ReferenceLocationColumn
Specifies the name of the reference table column that contains the location of the polygon description in WKT format.
ReferenceNameColumns
Specifies the names of the reference table columns that contain the names of the polygons.
BoundaryOperator
Specifies the boundary (geometry overlay) operator. For descriptions of these operators, see the following table.
Distance
[Required with BoundaryOperator('BUFFER').] Specifies the distance by which to extend or decrease the polygon.
OutputAll
[Optional] Specifies whether to include the result of nonintersection geometries in the output table. Default: 'false'.
Accumulate
[Optional] Specifies the source table columns to copy to the output table.
GeometryOverlay Boundary Operators
Boundary Operator Result Description
UNION


Result contains the area covered by the source polygon and the area covered by the reference polygon (the blue area in the figure).
INTERSECTION


Result contains the area that is common to the source and reference polygons (the blue area in the figure).
DIFFERENCE


Result contains the area covered only by the source polygon (the blue area in the figure).
SYMDIFFERENCE


Result contains the area covered by only the source polygon or only the reference polygon (the blue area in the figure).
CONVEXHULL


Result contains the smallest convex set that contains the source polygon in the Euclidean plane (the blue area in the figure).
BUFFER




Result contains the source polygon and specified buffer.

A positive buffer extends the area of the polygon. In the upper figure, the result includes both the buffer (blue) and the source polygon (pale pink).

A negative buffer decreases the area of the polygon. In the lower figure, the result includes only the source polygon (blue).

For the buffer operation, eight segments is adopted in curve approximation for the corners.