Hi Robert,
I disagree with the statement that the VariableDS 'knows' its data came
from a grib1 file. It'll likely have some attributes attached that mention
grib parameters, but the details of the underlying file format are
purposefully abstracted away. So, given just a VariableDS, I don't believe
it's possible to retrieve the decimalScaleFactor of the underlying grib
record.
However, if you're willing to work at a lower level in the stack, there are
some options. Here [1] is some test code where we open a grib1 record as a
RandomAccessFile and retrieve its GribData.Info. Once you have that object,
you can just read its decimalScaleFactor field.
Hopefully that'll get you started,
Christian
[1]
https://github.com/Unidata/thredds/blob/master/cdm-test/src/test/java/ucar/nc2/writer/TestGribSize.java#L125
On Mon, Apr 25, 2016 at 2:42 PM, Ben Caradoc-Davies <ben@xxxxxxxxxxxx>
wrote:
> Robert,
>
> why do you want these scale factors? The purpose of the readers is to
> apply these scale factors to the data and present the scaled data via the
> CDM API just as is done for a NetCDF file. No further scaling should be
> required.
>
> If I needed to get these raw scale factors I would instantiate a new
> ucar.unidata.io.RandomAccessFile and use it to create a
> Grib1Record/Grib2Record and get the scale factors from that object. I do
> not think it is possible to get this information via the CDM API.
>
> Kind regards,
> Ben.
>
> On 25/04/16 19:08, Robert Leander wrote:
>
>> Sirs, madams,
>>
>>
>>
>> Not being certain whether or not I sent my question to this list already,
>> I humbly apologize if this was the case.
>>
>> My question concerns the following.
>>
>>
>>
>> Currently, I am using the netcdf 4.6.3 java library to read data from
>> grib1 and grib2 files. I was able to open the file, which gives me at a
>> certain point a "VariableDS" object. This object 'knows' its data came from
>> a grib1 file. Now I am trying to get the decimalScalefactor of the original
>> gribdata through the getBinaryDataInfo of the grib1Record class, but for
>> this I need a grib1Record. How can I search this record in my dataset or is
>> there another way to get to the decimal- and binaryScalefactor ? I have
>> searched the manual and javadocs, but hitherto failed to find a solution.
>> If anyone could point me in the right direction, I would greatly appreciate
>> that.
>>
>>
>>
>> Thx for your answer!
>>
>>
>>
>>
>> Robert Leander
>>
>> E
>>
>> robert.leander@xxxxxxxxxxx
>>
>>
>>
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> Ben Caradoc-Davies <ben@xxxxxxxxxxxx>
> Director
> Transient Software Limited <http://transient.nz/>
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