Hi Alejandro :
well, thats complicated. the short answer is that we map collections of GRIB
records to netcdf multidimensional arrays.
you could read this as background:
http://www.unidata.ucar.edu/blogs/developer/en/entry/dataset_schemas_are_lost_in
you can use lower level GRIB APIs, but we dont support or document them, and
you would have to read code to understand how to use them.
download ToolsUI and use it to read your GRIB file so you get a sense of it:
http://www.unidata.ucar.edu/software/thredds/v4.4/netcdf-java/documentation.htm
Open in the Viewer tab; also open in IOSP/GRIB1(2)//GRIB1(2)Collection which
shows you the underlying GRIB recordss.
John
On 1/16/2014 1:31 PM, Alejandro Villamarin wrote:
> Hello John,
>
> Thanks for your quick response. I'm a newbie with both GRIB and NetCDF,
> but I don't see a relationship between the NetcdfFile methods and the
> GRIB structure (so far, I'm reading this:
> http://www.wmo.int/pages/prog/www/DPS/FM92-GRIB2-11-2003.pdf). For instance:
>
> String filename = "gfs_4_20140115_1200_192.grb2";
> NetcdfFile ncfile = null;
> try {
> ncfile = NetcdfFile.open(filename);
>
> List<Dimension> dimensions = new ArrayList<Dimension>();
> dimensions = ncfile.getDimensions();
> Iterator<Dimension> iterator = dimensions.iterator();
> while (iterator.hasNext()){
> Dimension current = iterator.next();
> current.toString();
> }
>
> How are the dimensions mapped into the structure of a GRIB file? Same
> goes for the getVariables() method...thus, that's why I was asking for a
> full working example of parsing a GRIB file :)
>
> Regards,
> Alejandro
>
>
> On Thu, Jan 16, 2014 at 2:56 PM, John Caron <caron@xxxxxxxxxxxxxxxx
> <mailto:caron@xxxxxxxxxxxxxxxx>> wrote:
>
> Hi Alejandro:
>
> You just open a GRIB file like its a netcdf file and access it
> through the netCDF API.
>
> some tutorials are at:
>
>
> http://www.unidata.ucar.edu/software/thredds/v4.4/netcdf-java/tutorial/index.html
>
> John
>
>
> On 1/16/2014 5:08 AM, Alejandro Villamarin wrote:
>> Hi there!
>>
>> I'm wondering if I can use NetCDF-Java library to parse GRIB2
>> files. So far I'm able to open and display file contents from a
>> GRIB2 file, but I'm wondering if it is possible to actually parse
>> the file: go through the variables and get the values, basically.
>> If so...are there any examples?
>>
>> Kind regards,
>> Alejandro
>>
>>
>> _______________________________________________
>> netcdf-java mailing list
>> netcdf-java@xxxxxxxxxxxxxxxx <mailto:netcdf-java@xxxxxxxxxxxxxxxx>
>> For list information or to unsubscribe,
>> visit:http://www.unidata.ucar.edu/mailing_lists/
>
>
> _______________________________________________
> netcdf-java mailing list
> netcdf-java@xxxxxxxxxxxxxxxx <mailto:netcdf-java@xxxxxxxxxxxxxxxx>
> For list information or to unsubscribe, visit:
> http://www.unidata.ucar.edu/mailing_lists/
>
>
