[pyngl-talk] how to use the new MRMS grib codetable

[David Brown]

Hi Ben,
Coincidentally, there is someone also asking about MRMS data support
for NCL. I am not sure at this point whether it is just a matter of
creating the right tables or whether some source code changes will be
needed as well. But given the amount of interest I will look into this
now.
 -dave

On Thu, Jul 2, 2015 at 1:25 PM, Root, Benjamin <broot at aer.com> wrote:
> ...unless one is having difficulties compiling the new wgrib2 package
> (grrr...).
>
> I guess what I am trying to get at is (1) is there a utility that can
> help convert a wgrib2 codetable into a form recognizable by the ecmwf
> grib api and (2) how does one get custom codetables recognized by PyNIO?
>
> Ben Root
>
> On 07/02/2015 03:12 PM, David Brown wrote:
>> Hi Ben and Nick,
>> Thanks Nick for the pointer to MMM-Py. From there I can get to
>> information about the MRMS data, plus some sample data sets.
>> The key point, relative to PyNIO from this documentation is the following:
>>
>> "The GRIB2 IDs used by MRMS are not officially sanctioned at this
>> time.  Instead, MRMS uses a local discipline number (209) and it’s own
>> set of category and parameter values.  This means that most widely
>> available GRIB2 decoders will require customization."
>>
>> MMM-Py relies on a customized version of wgrib2 to do the actual
>> reading. To make this data readable by PyNIO it will probably be
>> easiest to work from the modified wgrib2 code. This may be pretty
>> simple, but it will take a bit of research.
>>
>> So for now, I would agree that MMM-Py is probably the best bet.
>>  -dave
>>
>>
>>
>>
>> On Thu, Jul 2, 2015 at 12:14 PM, Nick Guy <Nick.Guy at uwyo.edu> wrote:
>>> Ben,
>>>
>>> Not sure what your use is, but this package works to read in MRMS and is
>>> pretty nice to work with:
>>> https://github.com/nasa/MMM-Py
>>>
>>> Nick
>>>
>>> On Jul 2, 2015, at 12:00 PM, pyngl-talk-request at ucar.edu wrote:
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>>> Today's Topics:
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>>>   1. how to use the new MRMS grib codetable (Root, Benjamin)
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>>> ----------------------------------------------------------------------
>>>
>>> Message: 1
>>> Date: Thu, 2 Jul 2015 16:43:27 +0000
>>> From: "Root, Benjamin" <broot at aer.com>
>>> Subject: [pyngl-talk] how to use the new MRMS grib codetable
>>> To: "pyngl-talk at ucar.edu" <pyngl-talk at ucar.edu>
>>> Message-ID:
>>> <47A91F4E74556440877A9E87A31CE9D20952D420 at VRSKUTMB2.veriskdom.com>
>>> Content-Type: text/plain; charset="us-ascii"
>>>
>>> I am working with the (somewhat) new MRMS datafeed from NCEP. I managed
>>> to find a codetable for it in the wgrib2 source code:
>>> http://www.ftp.cpc.ncep.noaa.gov/wd51we/wgrib2/user_tables/MRMS_usertable,
>>> but I am stuck in trying to get PyNIO to utilize it. I am not even sure
>>> if it is in the right format for use in PyNIO.
>>>
>>> Any tips would be appreciated.
>>>
>>> Cheers!
>>> Ben Root
>>>
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