GetFaceByPoint — Finds face intersecting a given point.
integer GetFaceByPoint(varchar atopology, geometry apoint, float8 tol1
Finds a face referenced by a Point, with given tolerance.
The function will effectively look for a face intersecting a circle having the point as center and the tolerance as radius.
If no face intersects the given query location, 0 is returned (universal face).
If more than one face intersect the query location an exception is thrown.
Enhanced: 3.2.0 more efficient implementation and clearer contract, stops working with invalid topologies.
SELECT topology.GetFaceByPoint('ma_topo',geom, 10) As with1mtol, topology.GetFaceByPoint('ma_topo',geom,0) As withnotol FROM ST_GeomFromEWKT('POINT(234604.6 899382.0)') As geom; with1mtol | withnotol -----------+----------- 1 | 0
SELECT topology.GetFaceByPoint('ma_topo',geom, 1) As nearnode FROM ST_GeomFromEWKT('POINT(227591.9 893900.4)') As geom; -- get error -- ERROR: Two or more faces found