NetCDF/GRIB reader

A collection of functions to read GRIB and netCDF files

Description

MATLAB-CDI is a collection of MATLAB functions that import/read GRIB and netCDF files through high-level function calls that follows an unified syntax. The package supports a subset of the full GRIB and netCDF format specification typically produced by climate models.

Technically speaking, MATLAB-CDI consists of mex-interfaces to the CDI library that read GRIB/netCDF. CDI is the basic library underlying the famous CDO (Climate Data Operators) developed by Max-Planck Institut für Meteorologie in Hamburg. The MATLAB-CDI interface package has been developed by The MathWorks Consulting on behalf of the Rossby Centre, SMHI.

MATLAB-CDI has been compiled and tested under Linux and Windows. The Linux installation is straightforward, while the Windows installation in the worst case requires experience of how to compile and install programs in a Linux-like environment such as cygwin or MinGW. (Actually, it's not the MATLAB-CDI package that causes the problems, it's the netCDF and CDI libraries that need to be compiled under Windows, nothing for the faint-of-heart.)

• MATLAB release: MATLAB 7.3 (R2006b)

[YU]

Hello Klaus Wyser,
1) I have a probleme of compilation:
run 'compile'
COMPILING cdi_varlist...
cdi_mx.c: In function 'getLevel':
cdi_mx.c:431: warning: incompatible implicit declaration of built-in function 'modf'
/usr/bin/ld: cannot find -lcdi
collect2: ld returned 1 exit status
mex: link of 'cdi_varlist.mexglx' failed.
2)I've coped my own compile "libcdi.a",and "libnetcdf.a" under the directory "lib64".
3)I have the cdi_readall.mexw32 cdi_readfield.mexw32 cdi_readfull.mexw32 cdi_readmeta.mexw32 cdi_varlist.mexw32.
But my machine is i686. So i think i must have the mex file in mexw64??
Thanks avance!
Jingmei

[TideMan]

Well, the mexw32's didn't work in Matlab 2006a on Win XP. They gave an "Invalid MEX-file.." message. So, I guess I'm screwed unless I go to all that trouble to compile myself, which looks like a daunting process. Could you possibly provide a Win32 binary package?

[Martin]

this package didn't compile in Matlab R2009b and R2010a with following error:

>> compile
COMPILING cdi_varlist...
cdi_mx.c: In function ‘getLevel’:
cdi_mx.c:431: warning: incompatible implicit declaration of built-in function ‘modf’
cdi_mx.o: In function `readmeta':
cdi_mx.c:(.text+0x1457): undefined reference to `mxErrMsgIdAndTxt'
cdi_mx.c:(.text+0x14e3): undefined reference to `mxErrMsgIdAndTxt'
collect2: ld returned 1 exit status

    mex: link of ' "cdi_varlist.mexa64"' failed.

??? Error using ==> mex at 221
Unable to complete successfully.

Error in ==> compile at 15
mex cdi_varlist.c cdi_mx.c -Iinclude -Llib64 -lcdi -lnetcdf
 

It cleanly compiled on R2008b, though.

[Matias]

A few tips...

In 64-bit systems:
Be sure to compile netcdi, and cdf libraries with -fPIC enabled.

In newer versions of MATLAB: open cdi_mx.c and replace the obsolete function mxErrMsgIdAndTxt with something else (or just comment out). I succesfully used mexprintf instead.

[Julie]

Hello everyone,

I was able run the file 'compile.m' successfully. However when I call the following function
c = cdi_varlist(filename,[]);
I get the following
error: cdi_varlist: No such file or directory
Although I'm pretty sure the file name and path is correct. I identified the error coming from the file cdi_mx.c at the following line
streamID = streamOpenRead(szInputFilename);
So basically 'streamOpenRead' cannot open my file although the path and the name are correct. I tried with and without the file extension (.grb). Also, no capabilities to read the contents of the file (e.g. \private\...) are actually required.

Does anybody know why it does not work?

[Julie]

Ok, it works, sorry. I reinstalled CDI and now it works...

[Van]

Does this reader read grib2 data format or only grib 1? I also encountered this problem when compiling:

COMPILING cdi_varlist...
/usr/bin/ld: cannot find -lcdi
collect2: ld returned 1 exit status

    mex: link of 'cdi_varlist.mexa64' failed.

Van