A general issue with Zarr, JSON and the CF conventions.

[gdkrmr]

However, if the scale_factor and add_offset attributes are of a different data type from the variable (containing the packed data) then the unpacked data should match the type of these attributes, which must both be of type float or both be of type double .

From the CFConventions 8.1 Packed Data.

Here is another issue with Zarr specifically: I don't think JSON can define Float32 and other data types, scale_factor and add_offset should be the same data type as the unpacked data. This means, at least in a strict sense, that we cannot have Float32 variables. Not sure what to do about this

[gdkrmr]

cf-convention/cf-conventions#422 I have asked this on the CF conventions repository.