2013 3:35 PM
To: PostGIS Users Discussion
Subject: Re: [postgis-users] accuracy of coverage
>From http://postgis.refractions.net/documentation/manual-svn/ST_DWithin.html :
boolean ST_DWithin(geography gg1, geography gg2, double precision
distance_meters);
boolean ST_DWithin(
Gold, Jack L (US
> SSA)
> Envoyé : mercredi 1 mai 2013 20:34
> À : PostGIS Users Discussion
> Objet : Re: [postgis-users] accuracy of coverage
>
> This 4000.0 is a double precision distance as defined by ST_DWithin ("The
> distance is specified in units defined by the s
ne-
De : postgis-users-boun...@lists.osgeo.org
[mailto:postgis-users-boun...@lists.osgeo.org] De la part de Gold, Jack L (US
SSA)
Envoyé : mercredi 1 mai 2013 20:34
À : PostGIS Users Discussion
Objet : Re: [postgis-users] accuracy of coverage
This 4000.0 is a double precision distance as
tgis-users-boun...@lists.osgeo.org] On Behalf Of
b.j.kob...@utwente.nl
Sent: Wednesday, May 01, 2013 1:25 PM
To: postgis-users@lists.osgeo.org
Subject: Re: [postgis-users] accuracy of coverage
Since Gmaps uses not the geographic positions (lat-lon), but the feared "google
maps projection&
--Original Message-
From: postgis-users-boun...@lists.osgeo.org
[mailto:postgis-users-boun...@lists.osgeo.org] On Behalf Of
b.j.kob...@utwente.nl
Sent: Wednesday, May 01, 2013 1:25 PM
To: postgis-users@lists.osgeo.org
Subject: Re: [postgis-users] accuracy of coverage
Since Gmaps uses not the
Since Gmaps uses not the geographic positions (lat-lon), but the feared
"google maps projection" which has many geodetic problems, I would trust
the PG calculation. However, are you sure the 4000 in your SQL will be
interpreted as meters, not as 4000 decimal degrees (in that case the point
will cer
I am trying to determine the accuracy of the ST_DWithin function. I have a
position at 32.52550166, -84.96989441 and I want to know if it is within a
projected circle of 4km radius centered on 32.5, -85.
I am running the following query:
SELECT "id","location", ST_AsText(location) as "text_pos
