bp_polygon

Geometric functions > bp_polygon

syntax

• bp_polygon(polygon_data_item)

description

bp_polygon(polygon_data_item) results in a data item with the same domain as the polygon_data_item, with the geometry cleaned and validated using the Boost Polygon library. It can be used to repair or normalize polygon geometries.

The bp_ prefix of the function name indicates that the implementation of the operator uses the Boost Polygon library, which requires integer coordinates (ipoint or spoint).

applies to

• attribute polygon_data_item with a polygon value type with integer coordinates (ipoint or spoint)

conditions

1. The composition type of the polygon_data_item needs to be polygon.
2. The data item must have a point value type with integer coordinates (ipoint or spoint).

since version

15.6.0

example

attribute<ipoint> geometry_clean (district) := bp_polygon(district/geometry);

see also

• bp_union_polygon
• bp_split_polygon
• geos_polygon
• cgal_polygon
• bg_polygon