[GRASS-dev] Testing the new ZSTD raster compression - was: Re: GRASS GIS raster files: LZW compression?

Nikos Alexandris nik at nikosalexandris.net
Sun Jun 10 11:44:19 PDT 2018


>> I am building a docker image, based on trunk, for which I need to ensure
>> that ZSTD is the default compressor.
>> What is the way to pre-set this at the configuration step, before
>> compiling, so as to avoid to take care about it later on by setting

Markus M:

>ZSTD is already the default compressor if available, no further settings


However, descriptions of compressors in the raster indroduction for
trunk [0], are maybe confusing.

ZLIB's deflate is the default compression method for all raster maps.


... ZSTD is the recommended default compression method.

The same piece of text is used for `r.compress` [1].
[0] https://grass.osgeo.org/grass75/manuals/rasterintro.html
[1] https://grass.osgeo.org/grass75/manuals/r.compress.html

I realised this before commenting in #3499. Yet, I thought "default" is ZLIB, and "recommended default" (like: "dear user,
it's best if you set ZSTD as the default") is ZSTD.

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