Scale factor and offset problem

[John Caron]

Hi Didier:

Is there some reason to unpack and repack?

If you open with NetcdfDataset.openFile() it will not get unpacked - you will have the original variable and data.

John

Didier Earith wrote:
> Hi all,
> 
> I have a problem with scale factor and offset when I use th netcdf java 
> API (v2.2.20).
> 
> I have to extract netcdf variables with scale_factor and offset 
> attributes and write the results as another netcdf file.
> 
> The NetcdfDataset class automatically deals with scale_factor and offset 
> attributes when it opens dataset, and that's right (but it removed 
> scale_factor and add_offset attributes)
> 
> But when I want to write variables into another netcdf file, I need to 
> have the data type, the scale factor and offset values of the original 
> variables to packed data again.
> 
> The VariableDS class provides a public getOriginalDatatype API, that's OK.
> But scale factor and offset attribute of the VariableDS class are 
> private and there is no API get them.
> 
> I saw the getOriginalVariable in the VariableDS class which return the 
> original variable with the scale_factor and add_offset attributes. But 
> unfortunately, this API is not visible (private) :
> 
>  ucar.nc2.Variable getOriginalVariable() {
>     *return* orgVar; // proxy.getOriginalVariable();
>   }
> 
> So, how can I get the scale factor and offset values with netcdf java 
> API to pack again the variables.
> 
> Didier.
> 
> 
>  

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