> 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
