[OpenLayers-Users] Different Projection transformation for EPSG:3785 between Oracle and OL

Etides etienne.desgagne at roche.ca
Tue Feb 9 11:04:07 EST 2010


Hi,

    I'm using Oracle Spatial to transform some polygon features from
EPSG:4326 to the Google Spherical projection EPSG:3785 and it give me a
different result than when projecting my features in a vector layer in
OpenLayer to use with a Google base map. I have a difference of about 5km.

Here is the WKT definition of the EPSG:3785 projection of Oracle:

PROJCS["Popular Visualisation CRS / Mercator", GEOGCS [ "Popular
Visualisation CRS", DATUM ["Popular Visualisation Datum (EPSG ID 6055)",
SPHEROID ["Popular Visualisation Sphere (EPSG ID 7059)", 6378137,
1000000000000]], PRIMEM [ "Greenwich", 0.000000 ], UNIT ["Decimal Degree",
0.01745329251994328]], PROJECTION ["Popular Visualisation Mercator"], UNIT
["Meter", 1]]

Someone has an idea what is the cause of this transformation difference?

Thanks a lot

Etienne
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