Comparing 32 bit and 16 bit elevation GeoPackages
Revision as of 09:42, 14 June 2024 by Mbu (talk | contribs) (Created page with "The tiled gridded coverage GeoPackage extension allows 32 bit source data to be converted to a GeoPackage with 16 bit integer tiles in PNG format, and still retain a significant number of decimals. This is accomplished by calculating a ''scale'' and ''offset'' for each tile, so that every tile utilizes the full space of the UInt16 data type (0- 65536). offset = min(tile) scale = (max(tile) - min(tile)) / (2^16 - 2)")
The tiled gridded coverage GeoPackage extension allows 32 bit source data to be converted to a GeoPackage with 16 bit integer tiles in PNG format, and still retain a significant number of decimals. This is accomplished by calculating a scale and offset for each tile, so that every tile utilizes the full space of the UInt16 data type (0- 65536).
offset = min(tile)
scale = (max(tile) - min(tile)) / (2^16 - 2)