bp_split_union_polygon

geometric-functions bp_split_union_polygon

syntax

  • bp_split_union_polygon(polygon_data_item) (formerly known as [[split_union_polygon]])
  • bp_split_union_polygon(polygon_data_item, relation) (formerly known as split_partitioned_union_polygon)

description

bp_split_union_polygon(polygon_data_item, relation) results in a new uint32 domain-unit with single polygons for each (multi)polygon in the polygon_data_item argument, and also dissolves over the relation.

conditions

  1. The composition type of the polygon_data_item argument needs to be polygon with an ipoint or spoint value-type.
  2. The domain unit of the polygon_data_item argument must be of value type uint32.

function type

  • bp_split_union_polygon(D->P)-> S { geometry: S->P }
  • bp_split_union_polygon(D->P, part_rel:D->R)-> S { geometry: S->P, part_rel->S->R }

where P is a GeoDms point type with signed integer coordinates, i.e. 16, 32, or 64-bit signed integers. S is the resulting uint32 set of split polygons, D is the domain of the argument, and R is the values unit of the partitioning part_rel.

since version

15.6.0

example 

unit<uint32> split_dissolve := bp_split_union_polygon(multipolygon/geometry);
unit<uint32> split_dissolve := bp_split_union_polygon(multipolygon/geometry, multipolygon/regio_rel));

see also