geometric-functions bg_buffer_multi_point


  • bg_buffer_multi_point(arc/polygon_data_item, size, nr_angles)


bg_buffer_multi_point(arc/polygon_data_item, size, nr_angles) results in a multi polygon data-item with buffer circles around each coordinate in the arc/polygon_data_item. The resulting data item has the same domain-unit as the arc/polygon_data_item.

The size arguments indicate the buffer circle size.

The nr_angles arguments indicate how many angles are used to make the buffer circles. More angles result in smoother circles but also in more data.

The bg_ prefix of the function name indicates that the implementation of the operator uses boost geometry library, more specifically, the buffer function.

applies to

since version



attribute<fpoint> buffer_circles (polygon, district) := bg_buffer_multi_point(district/geometry, 10.0, 16b);

more examples of buffer functions can be found here: Buffer processing

see also