[OpenLayers-Dev] Projection

[Adam Ratcliffe]

EPSG:4326 is the code for the WGS84 coordinate reference system.  OpenStreetMap tiles are rendered using the Spherical Mercator coordinate reference system (EPSG:900913 )so in order to use longitude/latitude coordinates with a Spherical Mercator map they must first be reprojected to Spherical Mercator coordinates.

There's a good description of this on the OSM website: http://docs.openlayers.org/library/spherical_mercator.html

Cheers
Adam

On 14/08/2010, at 2:44 AM, Leonardo Gaona wrote:

> What are the projections EPSG: 4326 ??
> and why we must transform from EPSG: 4326 to EPSG:900913 when we use osm maps _______________________________________________
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