[OpenLayers-Dev] Reprojection from WGS84 to Spherical Mercator

Christopher Schmidt crschmidt at metacarta.com
Mon Jun 15 09:18:33 EDT 2009


On Mon, Jun 15, 2009 at 07:41:48AM -0400, Felipe Alcacibar wrote:
> Hi, some days ago the list shows me about google layers and spherical mercator.
> 
> everything is works fine, but i cannot do a good reprojection from
> WGS84 to Spherical Mercator
> i trying with postgis with the statement:
> 
> ST_transform(ST_setSRID(geom, 4326), 900913)
u=# insert into spatial_ref_sys VALUES (900913, 'EPSG', 900913, '', '+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +no_defs');
INSERT 0 1
u=# select astext(transform(geomfromtext('POINT(-22.19921875 1.47265625)',4326), 900913));
                  astext                   
-------------------------------------------
 POINT(-2471205.72725849 163953.396913541)
(1 row)


works for me. try dumping your current 900913 srs entry and adding it 
like this. 

> but when i see in the map the layer goes a lot km to the north, have
> some table to pass parameters
> for convertion bethween this projections, i search but i cannot found
> any response that tells me
> how i can do this.
> 
> very thanks in advance.
> 
> cheers
> 
> Felipe
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-- 
Christopher Schmidt
MetaCarta



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