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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 >> >> >> >> >> [Logo]<http://www.deltares.com/> >> >> www.deltares.com<http://www.deltares.com/> >> >> Postbus 177 >> 2600 MH Delft >> >> [Deltares Twitter] >> <http://www.twitter.com/deltares> >> >> [Deltares LinkedIn]<http://www.linkedin.com/company/217430> >> >> [Deltares Facebook]< >> https://www.facebook.com/pages/Deltares/154189334634001> >> >> >> >> [Think before printing]Please consider the environment before printing >> this email >> DISCLAIMER: This message is intended exclusively for the addressee(s) and >> may contain confidential and privileged information. If you are not the >> intended recipient please notify the sender immediately and destroy this >> message. Unauthorized use, disclosure or copying of this message is >> strictly prohibited. The foundation 'Stichting Deltares', which has its >> seat at Delft, The Netherlands, Commercial Registration Number 41146461, is >> not liable in any way whatsoever for consequences and/or damages resulting >> from the improper, incomplete and untimely dispatch, receipt and/or content >> of this e-mail . >> >> >> >> _______________________________________________ >> netcdf-java mailing list >> netcdf-java@xxxxxxxxxxxxxxxx >> For list information or to unsubscribe, visit: >> http://www.unidata.ucar.edu/mailing_lists/ >> >> > -- > Ben Caradoc-Davies <ben@xxxxxxxxxxxx> > Director > Transient Software Limited <http://transient.nz/> > New Zealand > > _______________________________________________ > netcdf-java mailing list > netcdf-java@xxxxxxxxxxxxxxxx > For list information or to unsubscribe, visit: > http://www.unidata.ucar.edu/mailing_lists/
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