[postgis-users] ST_WITHIN not behaving as expected

Larry Morroni larry at morroni.com
Mon Jun 30 15:26:21 PDT 2014


Found my own issue. The points make an hour glass and not a polygon. 

> On Jun 27, 2014, at 11:42 PM, Larry Morroni <larry at morroni.com> wrote:
> 
> Hi,
> I am running PostgeSQL 9.3.4 with PostGIS 2.1.2.  I am trying to understand why ST_WITHIN is returning false with the following query:
> SELECT ST_WITHIN(
> ST_GeomFromText('POINT (-82.53946 28.00927)',4326),
> ST_GeomFromText('POLYGON ((-90.0922483515624890 26.6419340127470115, -81.5778440546874890 28.7911293883253734, -90.0922483515624890 28.7911293883253734, -81.5778440546874890 26.6419340127470115, -90.0922483515624890 26.6419340127470115))',4326)
> )
> 
> If I place these shapes on a map then you can see that the point (blue) is clearly within this polygon bounds (attached). -> http://imagebin.org/314574
> I probably don't understand ST_WITHIN properly.  Can someone shed some light for me?  What am I doing wrong?
> 
> Larry
> 
> 
> 
> 
> <Screen Shot 2014-06-27 at 11.19.35 PM.png>
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