[ncl-talk] grib2 file read

[Debasish Hazra]

Hi Dennis,

The variables in the range  62000 to 62010 in the updated grib2 table "
http://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_table4-233.shtml" are
"optical depth" and has no units associated with them.

62000 Total Aerosol
62001 Dust Dry
62006 Sulphate Dry
62008 Sea Salt Dry
62009 Black Carbon Dry
62010 Particulate Organic Matter Dry

62010-62016 are mixing ratios in kg/kg

Debasish



On Tue, Jul 26, 2016 at 2:13 PM, Dennis Shea <shea at ucar.edu> wrote:

> 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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