WGRIB is a program to manipulate, inventory and decode
The program is known to work on machines ranging from 486s to
Cray supercomputers. (One fellow even ported it to a 286!)
The program is Y2K friendly (NCO Y2K testing procedure).
wgrib (gributil) is an operational NCEP program. On the IBM/SP,
it can be found at /nwprod/util/exec/wgrib,
Highlights for v1.8.x:
- Support for simple-packed spectral
data (Luis Kornblueh). Note: you still need spectral -> grid routines.
- Cleanup of triangular grid support
- New and improved tables
- More grid information, including scanning mode
- fixed bug in grid vs earth relative north (-v option only)
Highlights for v1.7.x:
- scans entire file for grib messages (D. Haalman)
- Added German Weather Service (DWD) tables 201, 202, 203 and 2
Support for triangular grid (Helmut P. Frank)
- fractional mb (NCEP local extension)
- added new levels
- updated NCEP operational GRIB table
- fixed thinned grids with bitmap
- NCEP ensemble support
- fixed -H option
- Support for the 3/6/12 hour forecast time units
- Fixed a bug with bitmap when the precision is greater than
24 bits. This is more of a theoretical problem as most people
(NCEP and ECMWF) limit the precision to 16 bits and I can't
imagine anyone using more than 24 bit of precision for
any meteorological data. Thanks LB for finding the bug.
- Source code in a tar file. For people who want to read
the source code before it is combined into wgrib.c.
- more time codes like SECONDS
- New or updated ECMWF grib tables: 128 129 130 131 140 150 160 170 180
Highlights for v1.6.x:
- fixed a problem with identifying 1997 Reanalysis files.
- fixed a problem with the GDS header in the -H option
- optional binary output of PDS and GDS (-H option)
- -d all (decode entire file)
- thinned grid support
- fix of my mis-interpretation on how year 2000 is stored in GRIB
- NCEP operational table
- updated documentation
Note: there were two definitions for SNOC and CWAT in the operational
and Reanalysis grib tables. For the time being, I'm calling snow cover
"SNOWC" and canopy water "CNWAT."
ECMWF ensemble information
C source code
Netscape: shift+left_mouse_button, (If your browser alters the code,
use anonymous ftp to download /pub/wgrib/wgrib.c)
ftp://ftp.cpc.ncep.noaa.gov/wd51we/wgrib (FTP access: documentation,
test files, etc.)
See above for source code. (For people who want
to read or re-use the source code.)
Windows: find vs. grep and egrep
You should use grep or egrep instead of the MS-DOS "find" command.
The (e)grep command is more flexible and it is consistent with the
documentation. Public domain versions exist for ms-dos, windows and
Win32 machines. Personally I would look for a grep based on GNU source
code. In your favorite internet search engine look for "+grep +gnu +windows".
2 GB limit, 32 vs 64 bit computers:
Wgrib is limited to 2 GB files when used on 32-bit machines such
as a pentium-4. (2 GB is the maximum value of a 32-bit integer.)
On 64-bit machines, the 2 gig limit is replaced by a really big number.
gribw grib decode/encode library (beta testing)
ECMWF ensemble meta data