1.. _raster.hf2: 2 3================================================================================ 4HF2 -- HF2/HFZ heightfield raster 5================================================================================ 6 7.. shortname:: HF2 8 9.. built_in_by_default:: 10 11GDAL supports reading and writing HF2/HFZ/HF2.GZ heightfield raster 12datasets. 13 14HF2 is a heightfield format that records difference between consecutive 15cell values. HF2 files can also optionally be compressed by the gzip 16algorithm, and so the HF2.GZ files (or HFZ, equivalently) may be 17significantly smaller than the uncompressed data. The file format 18enables the user to have control on the desired accuracy through the 19vertical precision parameter. 20 21GDAL can read and write georeferencing information through extended 22header blocks. 23 24Driver capabilities 25------------------- 26 27.. supports_createcopy:: 28 29.. supports_georeferencing:: 30 31.. supports_virtualio:: 32 33Creation options 34---------------- 35 36- **COMPRESS=**\ YES/NO : whether the file must be compressed with GZip 37 or no. Defaults to NO 38- **BLOCKSIZE=**\ block_size : internal tile size. Must be >= 8. 39 Defaults to 256 40- **VERTICAL_PRECISION=**\ vertical_precision : Must be > 0. Defaults 41 to 0.01 42 43Increasing the vertical precision decreases the file size, especially 44with COMPRESS=YES, but at the loss of accuracy. 45 46See also 47-------- 48 49- `Specification of HF2/HFZ 50 format <http://www.bundysoft.com/docs/doku.php?id=l3dt:formats:specs:hf2>`__ 51- `Specification of HF2 extended header 52 blocks <http://www.bundysoft.com/docs/doku.php?id=l3dt:formats:specs:hf2#extended_header>`__ 53