Re: can and will NCL be able to read complex packing in GRIB files anytime soon?

All,

Bill provided me with a file offline, and indeed, it has complex
packing not supported by NCL. When trying to read a variable off the
file, we get a warning:

       warning:GenericUnPack: NCL does not yet handle gridded data
with complex packing: no valid values returned

and the values are all zero.

We've created a trouble ticket for this and will look into adding
support for complex packing. I'm not sure yet if this will make it
into V5.2.0 (which will probably be pushed out to January).

--Mary

On Dec 14, 2009, at 12:28 PM, Mary Haley wrote:

> Hi Bill,
>
> Can you provide us with a sample file? If so, you can put it on ftp:
>
> ftp ftp.cgd.ucar.edu
> anonymous
> [Use your email address for the password]
> cd incoming
> put ...
> put ...
> :
> quit
>
> and then email me with the exact filename.
>
> I *think* NCL should be able to handle packed grids, but the main
> developer is in a class and I'll have to wait to ask him.
>
> --Mary
>
>
>
> On Dec 11, 2009, at 3:05 PM, Capehart, William J wrote:
>
>> I am working with some European GRIB1 data and while NCL (and
>> wgrib) can both read the headers for the data, it cannot unpack
>> the file. (in googling the errors from both wgrib and NCL this
>> seems to be an old problem). I have gotten as far as being able
>> to use NCEP’s cnvgrib program to translate the GRIB1 into GRIB2
>> but it only seems to want to use US/CAN grib tables. As such,
>> it’s giving me a lot of “missing” or “unknown” fields, all of whom
>> are called “255” and read in as 255 by NCL and ncl_convert2nc.
>> All that survives is are the U V and pressure fields.
>>
>> Are there plans to make complex packing in grib file readable by
>> NCL. Otherwise is there an easy solution here beyond hacking
>> cnvgrib.
>>
>> Thanks Much
>>
>> ================================================================
>> Bill Capehart <William.Capehart@sdsmt.edu> Associate Professor
>> Institute of Atmospheric Sciences Land Surface Processes
>> 213 Mineral Industries Building Hydrometeorology
>> South Dakota School of Mines and Technology Ph: +1-605-394-1994
>> 501 East Saint Joseph Street Fax: +1-605-394-6061
>> Rapid City, SD 57701-3995 Mobile: +1-605-484-5692
>> =================== http://capehart.sdsmt.edu ==================
>>
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Received on Mon Dec 14 14:11:42 2009