Re: Proposed ncl_convert2nc modification

Thank you! I had forgotten about the global_attributes information.

Julie

Dennis Shea wrote:
> Dave Brown will comment further on NCL's names and why they changed.
> Basically, when NCEP did not prescribe names, NCL made them up.
> Subsequently, NCEP specified the name. NCL always goes with the
> operational center specifies if a name is available.
>
> ========== Some general info =======================
>
> When NCL performs the conversion via "ncl_convert2nc" it *always*
> adds global attributes. One is the "NCL_Version"
>
> One of the 'dumps' was created with v4.3.1 which was
> released August 2007. This is roughly 2.5 years old.
>
> // global attributes:
> :creation_date = "Wed Feb 10 13:44:16 MST 2010" ;
> :NCL_Version = "4.3.1" ;
> :system = "Linux gtgn 2.6.18-6-amd64 #1 SMP Fri Aug 21 14:53:35
> UTC 2009 x86_64 GNU/Linux" ;
> :conventions = "None" ;
> :grib_source = "20100115_i15_f000_WRF-RR.grb2" ;
> :title = "NCL: convert-GRIB-to-netCDF" ;
>
>
> =====================
> The other was create with Version 5.1.0 released in March 2009
>
>
> // global attributes:
> :creation_date = "Fri Apr 2 11:02:18 MDT 2010" ;
> :NCL_Version = "5.1.0" ;
> :system = "Linux finch 2.6.26-2-amd64 #1 SMP Tue Jan 12 22:12:20
> UTC 2010 x86_64 GNU/Linux" ;
> :conventions = "None" ;
> :grib_source = "20100115_i15_f000_WRF-RR.grb2" ;
> :title = "NCL: convert-GRIB-to-netCDF" ;
> }
> ======================
>
> FYI: The current release is: Version 5.1.1 - June 16, 2009
> http://www.ncl.ucar.edu/current_release.shtml
>
> ======
> There is a beta 5.2.0 already available.
>
> http://www.ncl.ucar.edu/future_release.shtml
>
>
>
> On 04/06/2010 11:29 AM, Julie Prestopnik wrote:
>> Hi Dave and Dennis. Thank you for the information. One of my
>> co-workers indicated that she previously saw TURBKE_P0_L104_GLC0 for
>> Turbulent Kinetic Energy, but later saw TKE_P0_L104_GLC0 for Turbulent
>> Kinetic Energy for the same grib file (20100115_i15_f000_WRF-RR.grb2).
>>
>> I have attached the header information for both files.
>>
>> Both files were converted using ncl_convert2nc. Unfortunately, the file
>> with TURBKE_P0_L104_GLC0 was generated two days before that machine was
>> upgraded so I cannot determine which version of NCL was used or what
>> uname -a would have output at the time. It may be possible that this is
>> the result of a version upgrade.
>>
>> The version used to generate the file with TKE_P0_L104_GLC0 is 5.1.0 and
>> the output from uname -a is: Linux finch 2.6.26-2-amd64 #1 SMP Tue Jan
>> 12 22:12:20 UTC 2010 x86_64 GNU/Linux
>>
>> I have been told that there were other instances where this has occurred
>> and need to gather more information from the people who have experienced
>> this issue.
>>
>> Thank you for your help.
>>
>> Julie
>>
>> David Brown wrote:
>>>
>>> Hi Julie,
>>> We need more information about what you are asking. And as Dennis
>>> suggested, it would be helpful to have some sample files. NCL adds
>>> information as suffixes to the raw parameter names that come from
>>> various versions of the GRIB parameter tables based on the information
>>> found in the individual GRIB records. The suffixes are needed to ensure
>>> the uniqueness of each variable name as presented in the NCL context.
>>> Note that these variables are actually aggregations along level and time
>>> of individual GRIB records. It is certainly possible to provide your own
>>> parameter table to give any name you would like as parameter names, but
>>> the rest of the name (from the first underscore character to the end of
>>> the name) is needed to keep the data properly separated into unique
>>> individually accessible variables. So we need to know what you actually
>>> mean when you say the "field names change". Possibly you are getting an
>>> incorrect version of the parameter table. If so it could be a problem
>>> with the NCL code.
>>> -dave
>>>
>>> On Apr 5, 2010, at 7:28 PM, jpresto@ucar.edu wrote:
>>>
>>>> Hello. I have noticed when using ncl_convert2nc to convert WRFRR grib
>>>> files to netCDF format, sometimes the field names change. I would
>>>> like to
>>>> have the field names stay the same. It would be nice if ncl_convert2nc
>>>> had the following capability: if the input grib names were known, I
>>>> could
>>>> have a configuration file with the field names I would like to have
>>>> ncl_convert2nc output. Is this something that the maintainers of
>>>> ncl_convert2nc would be interested in modifying the code to do?
>>>>
>>>> Thanks,
>>>> Julie Prestopnik
>>>>
>>>> Software Engineer
>>>> Research Applications Laboratory
>>>>
>>>>
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>>
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Received on Tue Apr 6 13:54:36 2010