[gdal-dev] Index Tiling Questions for WMTS, Bing, Google/TMS

[esacree]

A few questions based on the GDAL examples for Google, Bing/VirtualEarth and
WMTS tile servers. 

1.  Google Maps has the tile/image origin in the upper left corner.  TMS has
the tile image origin in the lower left corner.   Where should the
tile/image origin be for Google maps when using the GDAL_WMS driver with the
TMS service?  Does it use the Google Maps tile origin or the TMS tile
origin?

2.  For WMTS where is the image origin?  I've read that the origin is at the
lower left corner as for TMS. Is this correct?

3.  For the USGS NationalMap WMTS servers there are 2 TileMatrixSets.  One
is default0028nm and the other is the GoogleMapsCompatible tile matrix set. 
Should both tile matrix sets be indexed the same way?

3.  For Bing/VirtualEarth the GDAL example is extremely brief.  It doesn't
show a data window or tile counts in the example.  A look at the
minidriver_virtualearth.cpp file doesn't help.  How do you get
Bing/VirtualEarth to retrieve more than one tile at a time?

Thanks!

Elaine



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