[gdal-dev] Space optimization of OSM XYZ tiles

[Eric Knudstrup]

I've just begun experimenting with adding a mosaic of GeoTIFFs to a 
smartphone application that needs to be available offline.
I was wondering if the transcoding could be done on demand on the 70Mb 
GeoTIFFs rather than having to store hundreds of megabytes of PNG files.
Or are there other optimizations that could be done.
These particular files don't need zoom levels higher than 12.