Lower_bound
Geometric functions lower_bound
syntax
- lower_bound(polygon_data_item)
definition
lower_bound(polygon_data_item) results in a Point Data item with the lowest X and Y value of the points in the polygon_data_item.
In the Dutch RD coordinate system, the lower_bound is the bottom left coordinate.
applies to
data item polygon_data_item with fpoint or dpoint Value type and composition type polygon
example
attribute<point_rd> lb (district) := lower_bound(district/geometry);
| district/geometry | lb |
|---|---|
| {21: xy(113810; 403025) … | xy(112312; 402428) |
| {17: xy(113269; 400990) … | xy(112176; 400817) |
| {19: xy(115099; 401238) … | xy(112888; 400888) |
domain district, nr of rows = 3