On 15-04-2014 18:43, MORREALE Jean Roc wrote:
If you're talking about the EAA EU_DEM then PNG isn't a good solution
as the whole raster as to be loaded to access a subset of it, a
compressed TIFF with TILED=YES would be better.
Also, you should not try to scale it down to byte as it would only 255
values, if I remember well the original data is in ctfloat32 so try to
scale it down to int32 for a huge size gain.
but the ASTER grids have lower real resolution than the SRTM (despite
being distributed as 1 arc sec grids) and the later are originally int16
, so scaling to 2 bytes ints should be OK.
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