[postgis-users] Spatial linking or selection

Nicolas Ribot nicolas.ribot at gmail.com
Fri May 15 03:29:05 PDT 2020


You can test for proximity between start and end points
Create spatial indexes on st_startpoint(geom) and st_endpoint(geom) on your
line features table (also index starting and ending points column in table

select t.id, r.id, r.geom
from start_end_table t join roads r on st_dwithin(t.startpoint,
st_startpoint(r.geom), 0.01) and st_dwithin(t.endpoint,
st_endpoint(r.geom), 0.01)

Adjust the 0.01 distance according to your data and their precision.


On Fri, 15 May 2020 at 11:42, Shaozhong SHI <shishaozhong at gmail.com> wrote:

> Given 2 tables.  One has the starting and ending points of roads, and the
> other has line features.  How best to do spatial linking or selection of
> road features?
> Can anyone enlighten me?
> Regards,
> Shao
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> postgis-users mailing list
> postgis-users at lists.osgeo.org
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