[GEMPAK #OYZ-792714]: Re: Help converting GEMPAK to grb format

Hi Julie,

I'm sorry you didn't receive a reply.  I can not find the ticket submitted on 
Jan 8, most likely it bounced from the support box because of the size of the 
attachments.  It happens occasionally, so I'm glad you wrote again.

First, I would suggest using gdgrib2 to write GEMPAK grids to grib2 format 
rather than grib1 with gdgrib.

http://www.unidata.ucar.edu/cgi-bin/gempak/manual/programs_index?gdgrib2

If this is your first time using gdgrib2 or GEMPAK, it would be good to follow 
the second example given in the above link (transferring a grid from GEM to 
grib2), but also you must have available the correct grib tables to match the 
variables in the GEMPAK file you're using, so if the data set is something 
uncommon we may have to work on the grib tables first.

Send me back the input you're using on GDGRIB and we'll try to construct an 
input set to accomplish your goal.

As for the grid, you can upload it to our GEMPAK Ramadda Repository here (just 
click on "Upload test data sets here" and you'll see the upload interface):

http://motherlode.ucar.edu/repository/alias/gempakuploads/

Michael James
Unidata





> I never received a response from anyone and am following up to see if
> someone could please provide assistance.
> 
> I have learned a lot since my last email to you (1/8).  I discovered
> 'gdinfo' so that I could look in the file and see its contents.  I
> discovered that 'gdgrib' had default values set for GFUNC, GLEVEL, and
> GVCORD, which I needed to set to 'ALL'.
> 
> It sounds like I need to create a table with the parameters I am
> interested in (ICE, IBSE, ITOP - I believe there are not standard
> parameter numbers for these parameters.) for GBTBLS, and I was hoping
> that someone could point me to some documentation on how to create the
> table I need.
> 
> Thanks,
> Julie
> 
> On 01/08/2013 11:03 AM, Julie Prestopnik wrote:
> > Hello.  My name is Julie, and I am a software engineer in RAL at NCAR. I
> > do not have any experience with the GEMPAK format, but have a need to
> > convert GEMPAK format to grb format as soon as possible.  I have looked
> > online at the tutorial and the other documentation online. I have found
> > that GEMPAK is installed on the machine I am using and the tool, gdgrib,
> > is available to me.
> >
> > I found the following page that describes the command "gdgrib":
> > http://www.unidata.ucar.edu/cgi-bin/gempak/manual/programs_index?gdgrib
> >
> > I don't know any information about the GEMPAK data that I have and tried
> > to run gdgrib with only the basic information (input and output file),
> > but I received an error (below).  I have a sample GEMPAK format file
> > that I have attached.  Ultimately this is not the data I will be working
> > with.  I will be working with RAP Ice Algo files from the AWC, which I
> > am working on obtaining now.
> >
> > Parameters requested: GDFILE,GFUNC,GDATTIM,GLEVEL,GVCORD,GBTBLS,GBFILE,
> > VERCEN,PDSVAL,PRECSN,WMOHDR,CPYFIL,PROJ,GRDAREA,KXKY.
> > GEMPAK-GDGRIB>GDFILE =
> > /d2/jpresto/ral_icing_algo/data/input/raw/ral_icing_algo/20120616/pg3_201206162115.gem
> >
> > GEMPAK-GDGRIB>GBFILE =
> > /d2/jpresto/ral_icing_algo/data/input/raw/ral_icing_algo/20120616/pg3_201206162115.grb
> >
> > GEMPAK-GDGRIB>run
> > Creating process: gplt for queue 0
> > [DG -7]  Input grid TMPC ^120616/2115 @500 %PRES cannot be found.
> > Parameters requested: GDFILE,GFUNC,GDATTIM,GLEVEL,GVCORD,GBTBLS,GBFILE,
> > VERCEN,PDSVAL,PRECSN,WMOHDR,CPYFIL,PROJ,GRDAREA,KXKY.
> >
> > Ultimately, the goal would be to run the gdgrib command in a script,
> > instead of manually using the interface above, for each file.
> >
> > It looks like I may need to have some knowledge of the underlying grid,
> > grid level, and vertical coordinates...  Any help you can provide with
> > regarding to the conversion and running in larger batches would be
> > greatly appreciated.
> >
> > Thanks,
> > Julie
> >
> 
> 
> --
> Julie Prestopnik
> National Center for Atmospheric Research
> Research Applications Laboratory
> Phone: 303.497.8399
> Email: address@hidden
> 
> 

Ticket Details
===================
Ticket ID: OYZ-792714
Department: Support GEMPAK
Priority: Normal
Status: Open