Re: [thredds] EPSG 3857 (google maps / 900913) in TDS 4.2.5

[Ivan PRICE <ivan.price@xxxxxxxxxxx>]

awesome.. adding the following (exactly as you provided below but 
without carriage returns and multiple spaces) works perfectly, no need 
for the false northing.

3857=PROJCS["WGS 84 / Pseudo-Mercator", GEOGCS["WGS 84", DATUM["World 
Geodetic System 1984", SPHEROID["WGS 84", 6378137.0, 298.257223563, 
AUTHORITY["EPSG","7030"]], AUTHORITY["EPSG","6326"]], 
PRIMEM["Greenwich", 0.0, AUTHORITY["EPSG","8901"]], UNIT["degree", 
0.017453292519943295], AXIS["Geodetic latitude", NORTH], AXIS["Geodetic 
longitude", EAST], AUTHORITY["EPSG","4326"]], PROJECTION["Popular 
Visualisation Pseudo Mercator", AUTHORITY["EPSG","1024"]], 
PARAMETER["Latitude of natural origin", 0.0], PARAMETER["Longitude of 
natural origin", 0.0], PARAMETER["False easting", 0.0], PARAMETER["False 
northing", 0.0], UNIT["metre", 1.0], AXIS["Easting", EAST], 
AXIS["Northing", NORTH], AUTHORITY["EPSG","3857"]]

thanks very much

-ivan




Le 31/03/2011 5:04 PM, Jon Blower a écrit :
> Hi Ivan, all,
>
> Apparently the WKT that should be added to the epsg.properties file in THREDDS 
> to suppor the EPSG:3857 projection is as follows.  If someone can confirm that 
> this works, this would be very helpful!
>
> PROJCS["WGS 84 / Pseudo-Mercator",
>     GEOGCS["WGS 84",
>       DATUM["World Geodetic System 1984",
>         SPHEROID["WGS 84", 6378137.0, 298.257223563, AUTHORITY["EPSG","7030"]],
>         AUTHORITY["EPSG","6326"]],
>       PRIMEM["Greenwich", 0.0, AUTHORITY["EPSG","8901"]],
>       UNIT["degree", 0.017453292519943295],
>       AXIS["Geodetic latitude", NORTH],
>       AXIS["Geodetic longitude", EAST],
>       AUTHORITY["EPSG","4326"]],
>     PROJECTION["Popular Visualisation Pseudo Mercator", 
> AUTHORITY["EPSG","1024"]],
>     PARAMETER["Latitude of natural origin", 0.0],
>     PARAMETER["Longitude of natural origin", 0.0],
>     PARAMETER["False easting", 0.0],
>     PARAMETER["False northing", 0.0],
>     UNIT["metre", 1.0],
>     AXIS["Easting", EAST],
>     AXIS["Northing", NORTH],
>     AUTHORITY["EPSG","3857"]]
>
> (Thanks to Martin Desruisseaux of the Geotoolkit team for this.)
>
> Jon
>
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