[Geotiff] Encoding EPSG:3857 (WebMercator) in GeoTIFF, and ArcGIS interoperability

[Even Rouault]

Hi,

I've collected in http://trac.osgeo.org/gdal/ticket/5924 a summary of issues 
and findings when trying to write GeoTIFF files in EPSG:3857 in a "standard" way 
(using ProjectedCSTypeGeoKey = 3857), while making them correctly displayed by 
ArcGIS (and ideally by other independant implementations).
The current situation is that there's no such way (AFAIK). I'd appreciate any 
feedback/suggestion related to that issue.

Best regards,

Even

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