[gdal-dev] Encoding EPSG:3857 (WebMercator) in GeoTIFF, and ArcGIS interoperability

[Dmitry Baryshnikov]

As for me the main problem is, that gdal write wrong WKT for 3857 
(http://trac.osgeo.org/gdal/ticket/3962).
The Geographic SRS use WGS84 ellipsoid 
(SPHEROID["WGS_1984",6378137,298.257223563]]) instead sphere 
(EXTENSION["PROJ4","+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 
+lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext 
+no_defs"],) and all the data shifts.

Best regards,
     Dmitry

15.04.2015 19:15, Even Rouault пишет:
> 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
>