[gdal-dev] Spherical Mercator projects and overviews?

Frank Warmerdam warmerdam at pobox.com
Thu Apr 9 10:46:26 EDT 2009


Stephen Woodbridge wrote:
> Hi all,
> 
> I have a question regarding imagery in spherical mercator projection in 
> geotiff images. Do overviews work correctly?
> 
> For example, I use EPSG:4326 and build lots of overviews and I can zoom 
> in and out and pan without a problem. Can I do the same thing with 
> EPSG:900913 (spherical mercator projection).
> 
> I'm working with LandSat imagery over large area and scale ranges.

Steve,

I can't see any reason that overviews would not work on spherical
mercator when they work on images in other coordinate systems.  The
overview handling is independent of the georeferencing.

Best regards,
-- 
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent



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