[postgis-users] St_intersection

[Paul Ramsey]

Co-linearity.

On Mon, Mar 19, 2012 at 10:44 AM, Bob Pawley <rjpawley at shaw.ca> wrote:
> Hi
>
> I am querying a geometry looking for intersection point between a line and
> an other geometry.
>
> The return is 2 points and 2 linestrings. (when I use st_union a geometry
> collection results)
>
> Can anyone tell me under what conditions that a st_intersection would return
> a linestring??
>
> insert into num_search (the_geom3)
> select st_intersection(Num_Search.the_geom1, entities.wkb_geometry)
> from entities, Num_Search
> where Num_Search.seq = 'R'
> and st_intersects(entities.wkb_geometry, Num_Search.the_geom1) = True
>
> Bob
>
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