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  • cwerner · 1 ✖

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  • What is the recommended way to do proper compression/ scaling of vars? · 1 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
375581841 https://github.com/pydata/xarray/issues/2005#issuecomment-375581841 https://api.github.com/repos/pydata/xarray/issues/2005 MDEyOklzc3VlQ29tbWVudDM3NTU4MTg0MQ== cwerner 13906519 2018-03-23T08:43:43Z 2018-03-23T08:43:43Z NONE

Maybe it's a misconception of mine how compression with add_offset, scale_factor works?

I tried using i2 dtype (ctype='i2')and only scale_factor (no add_offset) and this looks ok. However, when I switch to i4/i8 type I get strange data in the netCDFs (I write with NETCDF4_CLASSIC if this matters?)... Is it not possible to use a higher precision integer type for add_offset/ scale_factor encoding to get a better precision of scaled values?

About the code samples: sorry, just copied them verbatim from my script. The first block is the logic to compute the scale and offset values, the second is the enconding application using the decorator-based extension to neatly pipe encoding settings to an data array...

Doing a minimal example at the moment is a bit problematic as I'm traveling...

 
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   What is the recommended way to do proper compression/ scaling of vars? 307444427

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