Jim Regetz wrote:
> However, the existing GRASS_INT_ZLIB variable only applies to integer
> rasters, correct?
Correct. FP rasters never use RLE; they're either compressed with zlib
or uncompressed.
> Although in all cases this variable does indeed
> dictate whether the Cell_head "compressed" field is set to 1 or 2,
> AFAICT put_fp_data ignores it and uses zlib for writing compressed
> floating point rasters in either case. Is this intentional?
Yes. RLE probably wouldn't provide useful compression for FP rasters.
If a single variable was used for both integer and FP rasters, the
logical semantics would be:
value compression
integer float
0 none none
1 RLE zlib
2 zlib zlib
--
Glynn Clements <[email protected]>
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