[gdal-dev] no translation for Mercator to PROJ.4

[rawalpundi]

hello,

i'm trying to gdalwarp a google map tile geotiff
its SRS is a 3857.prj

PROJCS["WGS 84 / Pseudo-Mercator",GEOGCS["Popular Visualisation
CRS",DATUM["D_Popular_Visualisation_Datum",SPHEROID["Popular_Visualisation_Sphere",6378137,0]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Mercator"],PARAMETER["central_meridian",0],PARAMETER["scale_factor",1],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["Meter",1]]

unfortunately this proj is not supported by my framework
so I'm trying to convert it to a standard WGS84 proj :
gdalwarp -t_srs WGS84

but I get the following error :
ERROR6 : No translation for Mercator to PROJ.4 format is known

any idea of what it wrong ?
thanks











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