On Fri, Dec 8, 2023, at 21:11, Even Rouault wrote:
>
>>
>> - GeoTIFF DEFLATE 280 MB
> Is it with PREDICTOR=3 ? (If not, then the ZARR datasets should also be
> compressed with FILTER=DELTA to have a fair comparison)
I would expect a fair comparison to be between PREDICTOR=3 and FILTER=DELTA and
not the other way around, but it does seem to level the field significantly:
- GeoTIFF DEFLATE PREDICTOR=3 255 MB
- Zarr DELTA BLOSC zlib NONE 290 MB
- Zarr DELTA BLOSC zlib BIT 266 MB
- Zarr DELTA BLOSC zlib BYTE 259 MB
>> - Zarr BLOSC zlib NONE 281 MB
>> - Zarr BLOSC zlib BIT 253 MB
>> - Zarr BLOSC zlib BYTE 249 MB
>
So FILTER=DELTA yields worse compression, while GeoTIFF PREDICTOR=3 does very
well. No need for Zarr! I don't remember PREDICTOR=3 doing so well in the past,
so.. no idea :-).
_______________________________________________
gdal-dev mailing list
gdal-dev@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/gdal-dev
