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

[David Brown]

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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> ----------------------------------------------------------------------
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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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