[gdal-dev] SPHEROID["unretrievable - using WGS84"...

[Even Rouault]

Selon Hermann Peifer <peifer at gmx.eu>:

Hermann,

I've reproduced what you observe with trunk too and created ticket
http://trac.osgeo.org/gdal/ticket/3217 with 2 patches that solve the issue. One
must be applied in libgeotiff, the other one in the GTiff driver.

> Hi,
>
> testepsg EPSG:3785 gives [1], whereas
> gdalwarp -t_srs EPSG:3785 input.tif output.tif results into [2]
>
>
> This looks like a bug, or not? I am using gdal 1.6.2
>
> Hermann
>
>
> [1]
> Validate Succeeds.
> WKT[EPSG:3785] =
> PROJCS["Popular Visualisation CRS / Mercator",
>      GEOGCS["Popular Visualisation CRS",
>          DATUM["Popular_Visualisation_Datum",
>              SPHEROID["Popular Visualisation Sphere",6378137,0,
>                  AUTHORITY["EPSG","7059"]],
>              TOWGS84[0,0,0,0,0,0,0],
>              AUTHORITY["EPSG","6055"]],
>          PRIMEM["Greenwich",0,
>              AUTHORITY["EPSG","8901"]],
>          UNIT["degree",0.01745329251994328,
>              AUTHORITY["EPSG","9122"]],
>          AUTHORITY["EPSG","4055"]],
>      UNIT["metre",1,
>          AUTHORITY["EPSG","9001"]],
>      PROJECTION["Mercator_1SP"],
>      PARAMETER["central_meridian",0],
>      PARAMETER["scale_factor",1],
>      PARAMETER["false_easting",0],
>      PARAMETER["false_northing",0],
>      AUTHORITY["EPSG","3785"],
>      AXIS["X",EAST],
>      AXIS["Y",NORTH]]
>
> [2]
> Files: output.tif
> Size is 868, 580
> Coordinate System is:
> PROJCS["Popular Visualisation CRS / Mercator",
>      GEOGCS["Popular Visualisation CRS",
>          DATUM["unknown",
>              SPHEROID["unretrievable - using WGS84",6378137,298.257223563,
>                  AUTHORITY["EPSG","0"]],
>              AUTHORITY["EPSG","6055"]],
>          PRIMEM["Greenwich",0],
>          UNIT["degree",0.0174532925199433],
>          AUTHORITY["EPSG","4055"]],
>      UNIT["metre",1,
>          AUTHORITY["EPSG","9001"]],
>      AUTHORITY["EPSG","3785"]]
> Origin = (-5555588.989365539513528,11996289.038382656872272)
> Pixel Size = (15457.180606961637750,-15457.180606961637750)
> Metadata:
> (snip)
>
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