[gradsusr] gribmap modification

[Gomez Breogan]

Dear GrADS users and developers:

My name is Breogan  Gomez and I am working for the German Weather 
Service (DWD) in the data assimilation department. DWD's COSMO model 
(also used by other National Weather Services) has a peculiar time unit 
specification in their Grib output files. That are TimeUnit=13 and 
TimeUnit=14 to represent 15min output and 30min output. This is not WMO 
standard but is generally used by the German Weather Service and all the 
Centers within the COSMO community (http://www.cosmo-model.org/).

GrADS is perfectly able to read COSMO model output (using "gribmap") 
when the TU is speciffied in any WMO standard unit, but when TU-13 or 
TU-14 are used he is not able to find the correct time records in the 
grib file.

I recently I have performed a minor modification to "gribmap" code (at 
"gagmap.c") to include the support for this TU-13 and TU-14. This 
modification is fully compatible with other TU and  does not introduce 
any limitation in the application. I was was wondering if could be 
possible to introduce this modification in the standard GrADS release. 
This would help to expand GrADS use to a bigger set of scientists that 
are working with this high frecuency COSMO simulations.

Attached I include the modified gagmap.c source file (version: 2.0.a7.1 
has been used for this purpose). Just search for "DWD", only four lines 
had been added to the original file.

I hope you find this useful,

All the best,

Breogan Gomez

Ps: Similar improvements have been performed on "wgrib" and 
"grib2ctl.pl" applications and had been sent to Wesley Ebisuzaki, we are 
waiting for reply.


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