Geometric functions
Geometric functions calculate with geometries (coordinates) of points, arcs or polygons
point
- point_xy - make a point attribute based on an X and Y attribute
- point_yx - make a point attribute based on an Y and X attribute
- point_isnearby - compare if two points are (almost) the same location
- pointrow - get the row numbers of a point attribute
- pointcol - get the column numbers of a point attribute
- get_x - get the x coordinate of a point attribute
- get_y - get the y coordinate of a point attribute
- dist(ance) - calculate the distance between two point sets
- sq(ua)r(e)dist(ance) - calculate the square distance between two arrays of points
- bg_buffer_point - creates a buffer polygon for each point in a pointset
- point - DEPRECIATED: make a point attribute based on an X and Y attribute
polygon
- area - calculates the surface of each polygon
- centroid
- centroid_or_mid - the centroid if it is located within a polygon or else a mid-point of a polygon.
- poly2grid - a grid representation of polygons
- poly2grid_untiled - a grid representation of polygons
- lower_bound - the lowest X and Y values of the points in each polygon
- upper_bound - the highest X and Y values of the points in each polygon
- center_bound - the center X and Y values of the points in each polygon
- points2polygon
- sub-(difference) - a cutout of a polygon in another polygon, where both domains match or one is void
- mul-(polygon-intersection) - the overlap of two arrays of polygons, where both domains match or one is void
- add-(union) - the element-by-element union of two polygons, where both domains match or one is void
- box_connectivity - domain unit with the connected polygons based on their bounding box (this should be less precise but faster than polygon_connectivity)
Operators based on the boost-polygon library (usually slower than the _bg__-variants, and can only process integer coordinates):
- bp_split_polygon (or old syntax split_polygon) - domain unit with all single polygons
- bp_split_union_polygon (or old syntax split_partitioned_union_polygon) - combination of split_polygon and partitioned_union_polygon
- polygon-inflated - increases each polygon
- polygon-deflated - decreases each polygon
- polygon_connectivity - domain unit with the connected polygons
- bp_union_polygon (or old syntax union_polygon-(dissolve) or partitioned_union_polygon-(dissolve-by-attribute)) - *remove lines of adjacent polygons, optionally grouped by a relation**
- bp_overlay_polygon (or old syntax overlay_polygon
- [[bp_polygon]]
Several boost polygon functions can be combined in a single operator; for the full list of those combinations, see here
Operators based on the boost-geometry library (usually faster and can process float64 (a.k.a. double) coordinates):
- bg_simplify_single_polygon - simplify the geometry of a single polygon, see for documentation: bg_simplify_multi_polygon
- bg_simplify_multi_polygon - simplify the geometry of a multi polygon
- bg_buffer_single_polygon - creates a buffer polygon for each single polygon; see for documentation: bg_buffer_multi_polygon
- bg_buffer_multi_polygon - creates a buffer polygon for each multi polygon
- bg_outer_single_polygon - selects only the outer ring of a single polygon; see for documentation: bg_outer_multi_polygon
- bg_outer_multi_polygon - selects only the outer ring of a multi polygon
- bg_intersect - intersect the polygon arguments, where both domains match, or one is void
- bg_difference - takes the difference of the polygon arguments, where both domains match or one is void
- bg_union - union the polygon arguments, where both domains match or one is void
- bg_xor - xor the polygon arguments, where both domains match or one is void
- bg_overlay_polygon - see overlay_polygon
- bg_simplify_polygon - DEPRICIATED simplify the geometry of a polygon
- bg_split_polygon
- bg_union_polygon
- bg_split_union_polygon
- [[bg_polygon]]
For examples, see here.
points/arcs
- dyna_point / dyna_point_with_ends - configures a point set for an arc on an equal distance
- dyna_segment / dyna_segments_with_ends - configures a segment set for an arc on an equal distance
points/polygons
- point_in_polygon - index number of the polygon in which a point is located
- point_in_ranked_polygon - index number of the polygon in which a point is located, using a ranking in case a polygon is located in multiple polygons
- point_in_all_polygons - relation between index numbers of the polygons in which points are located
- sequence2points - all vertices of each arc/polygon as separate points
- points2sequence - constructs arc/polygon from vertices
arc/polygon
- arc_length
- mls_length
- split_multi_linestring
- arc2segm - divides an arc/polygon data item into segments
- bg_simplify_linestring - simplifies the geometry of an arc
- bg_buffer_linestring - creates a buffer polygon for each arc
- bg_buffer_multi_point- creates a buffer polygon for each coordinate of the arc/polygon
points/arcs/polygons
conversion
- rd2latlongwgs84 - converts coordinates from RD to LatLongWgs84
- latlongwgs842rd- converts coordinates from LatLongWgs84 to RD
- rd2latlongge- converts coordinates from RD to LatLongGE
- rd2latlonged50- converts coordinates from RD to LatLongEd50
- rd2latlong- converts coordinates from RD to LatLong