[Gdal-dev] GDAL to GeoTIFF can't handle certain datums?

[Ben Discoe]

I have an image in memory, with this CRS:

"PROJCS["Custom",GEOGCS["Rikets koordinatsystem 1990",DATUM["Rikets
koordinatsystem 1990",SPHEROID["Bessel 1841",6377397.155000,299.152810"...

I use GDAL to write it a GeoTIFF file.
Using gdalinfo on the resulting tif file says:

"Coordinate System is:
PROJCS["Custom",
    GEOGCS["Rikets koordinatsystem 1990",
        DATUM["unknown",
            SPHEROID["unnamed",6377397.155,299.1528100000047]],...

You can see that a lot got lost, in particular the Datum.  Is it possible
that the GeoTIFF format just isn't capable of storing this Datum?  Without
stepping the debugger way down into GDALDataset, i can't determine if GDAL
is failing to find a GeoTIFF equivalent for this datum, or not.

Thanks,
Bne