[gdal-dev] Problems with large ASTER GeoTIFF

[Joaquim Luis]

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.