Re: Re[8]: 19990120: Help with decoders!

On 2 Feb 1999, Jason Burks wrote:

> 
>      Robb,
>      I have found out a little more about the NOGAPS it is on the 240 grid. 
>      Now what do I have to modify to make gribdump to recognize the new 
>      grid? The files I have noticed that I think I have to change are 

Jason,

Here's the changes I would make, I'll probably miss some changes so you
will have to use the debugger.

In gbytem.c, under case FNOC add, with ? the size of the grid in bytes:

case  240: return full_gbytem(?);

>      models.h, add:

#define MODEL_240  ...

statement.


      models.c

A new switch statement needs to be added for CENTER_FNOC. ie

    case CENTER_FNOC:
        switch(model) {         /* does anyone know names for these? */
        case MODEL_240:
            return "description here";
        default: 
             return "unknown FNOC model";
...


gdes.c (maybe a new subroutine fnoc_240() to describe needed 
>      parameters, nx=,ny=, la1=, dx=,etc). 

Yes, add under case CENTER_FNOC: after 223 ....

case  240: return fnoc_240();

Then create procedure fnoc_240 using one of the other models as a
template. You will have to look at the 240 structure and the gdes.h file
for this part.

This is going to a trial and error method of building a completely new
grid. Be patience, it's not simple because of the numerous possibilities.
The ruc2.cdl file took me 5 days to complete and I had experience building
complex cdls.  After you complete this, could I have the changes to enter
into the code in case some one else wants a FNOC model?

Good luck

Thanks,
Robb... 

I just need some help here and 
>      then I will be on my way. If you could just tell me how to add a new 
>      model that would be great: Like what files I need to edit, etc.
>      thanks once again
>      Jason
> 
> 
> ______________________________ Reply Separator 
> _________________________________
> Subject: Re: Re[6]: 19990120: Help with decoders!
> Author:  address@hidden at EXTERNAL
> Date:    1/29/1999 3:44 PM
> 
> 
> On 29 Jan 1999, Jason Burks wrote:
>      
> >
> >      Robb,
> >      Sorry about all of the questions
> >      I am now trying to decode the Navy's NOGAPS model data supplied in 
> >      GRIB into netcdf format.
> Jason,
>      
> Contact Navy's NOGAPS people to see what they use to read there own grib 
> files. Also try to find out what is the model structure of NOGAPS. I 
> believe that gribtonc will have to be modified to translate these type of 
> grids.
>      
>      
> When I tried to use gribdump -h or grib -b, I
> >      get nothing. When I use gribdump -v on the file I get messages like 
> >      the following saying:
> >      oversize GRIB product
> >      error reading GRIB product
> >      It exits saying 0 WMO Msgs, 0 GRIBs decoded, 0 written
> >      is this because the the nogaps is not described anywhere in the
> >      program? What do I need to do to get it to work? The data is on a
> >      standard grid, I think 207. Thanks for all of your help, and sorry to 
> >      take your time.
>      
>      
> In file gdes.c at 1356 there is a definition for grid 207, does this match 
> the params of the raw file. At this point a debugger would surely pinpoint 
> the problem.  The gribtonc program is tailored to FOS/NOAAport types of 
> products, it's not a general translator.
>      
>      
> Here's a url to another grib reader, maybe it will work better:
>      
> http://wesley.wwb.noaa.gov/wgrib.html
>      
>      
>      
> Robb...
>      
>      
> >      Jason
> >
>      
> ===============================================================================
>  
> Robb Kambic                          Unidata Program Center
> Software Engineer III                  Univ. Corp for Atmospheric
>  Research
> address@hidden             WWW: http://www.unidata.ucar.edu/ 
> ===============================================================================
> 

===============================================================================
Robb Kambic                                Unidata Program Center
Software Engineer III                      Univ. Corp for Atmospheric Research
address@hidden             WWW: http://www.unidata.ucar.edu/
===============================================================================