Re: Need help on GRIB Reader

Hi Abhinav,

This is a fundamental question about how to interpret the octets of
GRIB 2 file. I would strongly suggest you that you employ a low-level
GRIB2 reading
library to perform this basic task for you, so that you can
concentrate on higher-level issues.

You can get the NCEP GRIB 2 reading code at

http://www.nco.ncep.noaa.gov/pmb/codes/GRIB2/

There are both C and Fortran versions.
Another option is the ECMWF GRIB API that Oliver Fuhrer suggested:

http://www.ecmwf.int/products/data/software/grib_api.html

I am not familiar with developing in a .NET environment so I do not
know what you would need to do to build either of these packages. I
suspect that the NCEP g2clib code would be easier to start with. It
is used by the wgrib2 utility, which I would recommend that you
become familiar with both as an example of a GRIB2 reader with
accessible code, and also as a development tool for checking whether
your code produces compatible results when fed the same input GRIB2
file.

Even if you decide to create low-level code yourself, you could
answer questions like the one below by studying the source code of
these packages.
Hope this helps.
   -dave

On Feb 2, 2009, at 2:22 AM, abhinav gosavi wrote:

> Hi All,
>
> I am developing a .NET reader for GRIB 2 file.
> I am not able to generate actual lenght from byte/octets.
> I have retrieved 0 0 0 0 0 3 100 38 as bytes from lenght section.
> ( 8 bytes allocated to represent length of each section )
> The actual size is that 222246 byte.
> How should i convert 0 0 0 0 0 3 100 38 to 222246 byte format???
>
> Please help me whoever work on GRIB reader in C,C++,java etc.
>
> Thanks & Regards,
> Abhinav Gosavi.
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Received on Mon Feb 02 2009 - 11:46:32 MST