[postgis-users] topology.GetFaceByPoint users around ?

Sandro Santilli strk at kbt.io
Tue Jun 29 03:52:07 PDT 2021

I'm rewriting core PostGIS Topology function to speedup
topology population, with a focus on finding faces
_properly_ containing a point (having the point on the
interior, not on the boundary).

We currently have a topology.GetFaceByPoint function
which I'm tempted to re-use as a signature for the
improved function, but that function also allows
finding faces having the query point on the boundary,
which is NOT what I want.

Now the question is: would people really need the
current behavior of that function and if so, why ?

I fail to understand in which case would anyone want
to deal with a tolerance for finding faces, unless 
they accept multiple faces as answer (a point on
a face boundary is ambiguous as to which face should
be returned).

So: do you use that function ? For what task ?

Reference: https://trac.osgeo.org/postgis/ticket/4933


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