I want to provide a geometry that was input from Google Maps (SRID 3857) for GPS units (SRID 4326). How should I do that?
I hated to post this, frankly. I know it's a "thinko;" I'm not understanding the concept. If I describe a geometry in SRID 3857, then it seems to me that that point would have a slightly different description in SRID 4326. Instead, they're wildly different. So, I know I am misunderstanding in some basic way. Ron ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Emilie Laffray Sent: Thursday, May 20, 2010 12:48 PM To: PostGIS Users Discussion Subject: Re: [postgis-users] I can't make sense of this. Why would you expect them to be similar? There are different sets of coordinates. Your first set of coordinates looks like wgs84 but you set the srid to Google srid. It doesn't make sense. On 20 May 2010 17:38, "Ronald Phillips" <[email protected]> wrote: SELECT ST_AsText( ST_GeomFromText('POINT(-81.064544 40.28787)', 3857) ) AS goog, ST_AsText( ST_Transform( ST_GeomFromText('POINT(-81.064544 40.28787)', 3857) , 4326) ) AS gcs 3857 is "Google's" SRID, and 4326 is a fairly standard GPS SRID. I'm getting this: Goog: "POINT(-81.064544 40.28787)"; Gcs: "POINT(-0.000728215188753794 0.000361912093851508)" What am I doing wrong, that they're so different? Ronald Phillips, B.S., M.S. Programmer/Analyst Summit County Engineer 538 E. South St. Akron OH 44311 330.643.8061 http://www.linkedin.com/in/rwphillips _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
_______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
