[postgis-users] ST_Contains vs. ST_Within

[cyw at dls.net]

Thanks. But the two behave differently.

I tried both with the same data (see below) , Within returned more records.

select * into dupage  from maj where Contains((select the_geom from city 
where area_id=21002891), the_geom)

select * into dupage  from maj where Within(the_geom, (select the_geom from 
city where area_id=21002891) )


----- Original Message ----- 
From: "Paul Ramsey" <pramsey at cleverelephant.ca>
To: "PostGIS Users Discussion" <postgis-users at postgis.refractions.net>
Sent: Thursday, September 04, 2008 5:59 PM
Subject: Re: [postgis-users] ST_Contains vs. ST_Within


> They in inverses.
>
> ST_Contains(A,B) <=> ST_Within(B,A)
>
> P.
>
> On Thu, Sep 4, 2008 at 3:49 PM,  <cyw at dls.net> wrote:
>> What are the difeerences between these two functions?
>> Thanks.
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