[postgis-users] St_within problem

[Bob Pawley]

I have tried it with the point and  geometry reversed with the same result.

Perhaps, I am not looking at this the right way.

According to the manual

st_within Returns TRUE if geometry A  (points) is completely inside geometry 
B ( geometry).

If it scans the list of 858 points some of those points are within the 
geometry - unless Postgis is looking at the 858 points as one entity.

Bob




----- Original Message ----- 
From: "Maxime van Noppen" <maxime at altribe.org>
To: "PostGIS Users Discussion" <postgis-users at postgis.refractions.net>
Sent: Monday, October 19, 2009 8:50 AM
Subject: Re: [postgis-users] St_within problem


> Bob Pawley wrote:
>>  select st_astext(graphics.point_grid.the_geom)
>>  from graphics.point_grid, library.dgm_process
>>  where library.dgm_process.process_number = '1'
>>  and st_within(graphics.point_grid.the_geom, 
>> library.dgm_process.the_geom);
>>
>> Any thoughts would be appreciated.
>
> Hi,
>
> From the documentation here :
>
> http://postgis.refractions.net/documentation/manual-1.4/ST_Within.html
>
>> boolean ST_Within(geometry A, geometry B);
>> Returns TRUE if geometry A is completely inside geometry B.
>
> I suggest that you just swap the arguments of the ST_Within function as
> a geometry will never be "completly inside" a point.
>
> -- 
> Maxime
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