Hi Lisek, http://www.fc.up.pt/pessoas/jagoncal/coordenadas/index.htm
Fred. On Wed, Nov 19, 2008 at 9:54 AM, Nicolas Ribot <[EMAIL PROTECTED]> wrote: > > Hello, > > > > last time i get shapefile witp Porto Portugal streets. > > I convert it to SQL an there was a column with data in SRID 27492. > > I added this data to database, create another column with 4326 SRID and > > transform data from 27492 to 4326 using: > > > > UPDATE axes SET the_geom_wgs = Transform(the_geom,4326); > > > > ok later i expotr file to KML to se it in google earth but the geom is > not > > shown in perfect position. It is moved to west south about 80 meters. > > > > I'm sure that data in 27492 is ok. So why after conversion it is not so > good > > in google earth? Did I do something wrong? Or forgot about something? > Maybe > > there are some additional options to correct it? > > > > Hello, > SRID 27492 reads "Datum 73 / Modified Portuguese Grid" > Is it possible that this SRS is based on a grid that is missing in > your PROJ4 installation, and that this grid would give extra precision > when dealing with objects ? > > Nicolas > _______________________________________________ > postgis-users mailing list > [email protected] > http://postgis.refractions.net/mailman/listinfo/postgis-users >
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