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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