[ncl-talk] grib2 file read

[Dennis Shea]

Again, I will forward this. please send to ncl-talk. Otherwise, I am just a
middleman forwarding the emails.

Usually the GRIB tables have units:

Examples:
http://www.ncl.ucar.edu/Document/Manuals/Ref_Manual/ncep_141.htm
http://www.ncl.ucar.edu/Document/Manuals/Ref_Manual/ecmwf_132.htm

NCL ... see GRIB section
See:
http://www.ncl.ucar.edu/Document/Manuals/Ref_Manual/NclFormatSupport.shtml

On Tue, Jul 26, 2016 at 12:05 PM, Debasish Hazra <debasish.hazra5 at gmail.com>
wrote:

> The link updated grib2 table is here :
>
> http://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_table4-233.shtml
>
> Thanks
> Debasish
>
> On Tue, Jul 26, 2016 at 1:33 PM, Dennis Shea <shea at ucar.edu> wrote:
>
>> The issue is that the NGAC grib tables are not publicly available.
>> If you know of where they are located, they can be included within NCL
>>
>> In fact, there is a JIRA ticket on this:
>> [JIRA] (NCL-2442) GRIB-2: warning: Entry (not found in code table file
>> .../grib2_codetables/ncep/4/4.3.tableJust yesterday, a comment was made
>> on this ticket:
>>
>> ---------
>>
>> Unfortunately the "not found in code table file" errors
>> that Dennis reported in this ticket cannot be corrected
>> because the entries for that were not found are not documented
>> by the NCEP GRIB2 web pages. Table 4.3 contains the generating process
>> mapping. The values found in the file, all in the range 62000 to 62016,
>> probably refer to local "generating processes" related to the NGAC model.
>> If documentation can be found to describe these I would be happy to add
>> them to the tables.
>>
>> The other option to get rid of these admittedly annoying
>> messages might be to just not print the warnings for this piece of
>> metadata
>> since it is not usually of that much interest to the data consumer. I
>> would
>> be happy to consider this.
>>
>> ---------
>> Note: the *values* returned by NCL are correct. The meta data is not
>> because the
>> NCEP GRIB2 web pages are not available.
>>
>> --------
>>
>> Again, if you know where the appropriate tables are located, please send
>> to ncl-talk.
>>
>> THX
>>
>> On Tue, Jul 26, 2016 at 11:21 AM, Debasish Hazra <
>> debasish.hazra5 at gmail.com> wrote:
>>
>>> Hi,
>>>
>>> I am trying to read grib2 file with ncl (v6.3) and it shows the
>>> following error while trying to open it:
>>>
>>> fatal:An internal error has occurred. The file format requested does not
>>> appear to be supported, could not open (ngac.t00z.aerf24.grib2)
>>> Variable: f
>>> Type: file
>>> (0) File Missing Value : -1
>>>
>>> I kept the data file in ftp. Any help on this is appreciated.
>>>
>>> Thanks.
>>> Debasish
>>>
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>
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