WGRIB 2

Provides functionality for interacting with, reading, writing, and manipulating grib2 files, with a CMake build.

See wgrib2 documentation and release page here.

This release of the wgrib2 package, with CMake build capability, is part of the NCEPLIBS project.

Users

Wgrib2 is used by the following projects:

• NOMADS uses wgrib2 in grib_filter (a wrapper for wgrib2) wgrib2 is used to create the *.idx files for random access.
• global-workflow, including post-processing and downstream products. Downstream jobs use wgrib2 to regrid GRIB2 files and extract variables. The new ocean/ice components will use wgrib2 to convert netCDF files to GRIB2 files.
• Ensemble Verification System(EVS), for processing GRIB2 files.
• Rapid Refresh Forecast System (RRFS).
• [The Climate Prediction Center (CPC)[(https://www.cpc.ncep.noaa.gov/) uses wgrib2 extensively to process GRIB2 files in their real-time applications.
• The MET/METplus software uses wgrib2 to extract information from GRIB2 files.
• The Global Forecast System (GFS) post-processing of the atmosphere component has been using wgrib2 to interplate the UPP output master files in Gaussian grid into pgrb2/pgrb2b files in lat-lon grid.

Authors

Wesley Ebisuzaki - CPC

Kyle Gerheiser (CMake build) - NOAA/EMC

Installing

Building wgrib2 requires, CMake, a C compiler, a Fortran compiler (optional), and various 3rd party libraries depending on build configuration.

The CMake build provided here supports most build options (NetCDF, PNG, Jasper, spectral, and ipolates), but not certain features such as MySQL. If those features are necessary please use the makefile build provided in the link above.

mkdir build && cd build
cmake .. -DCMAKE_INSTALL_PREFIX=install -DCMAKE_PREFIX_PATH=path/to/dependencies
make
make install

Using the wgrib2 library

To use the wgrib2 library the CMake build offers a package config.

After running find_package(wgrib2) CMake will generate the following targets for use in your project:

wgrib2::wgrib2_lib (c library)
wgrib2::wgrib2_api (fortran target)

Default Build Options

• USE_NETCDF3 = OFF

• USE_NETCDF4 = ON

• USE_REGEX = ON

• USE_TIGGE = ON

• USE_MYSQL = OFF (not yet supported in CMake)

• USE_IPOLATES = 0 (= 3 requires ip2 lib)

• USE_SPECTRAL = OFF (requires SP lib)

• USE_UDF = OFF (not yet supported in CMake)

• USE_OPENMP = OFF

• USE_PROJ4 = OFF (not yet supported in CMake)

• MAKE_FTN_API = ON

• DISABLE_ALARM = OFF

• USE_G2CLIB = OFF (not yet supported in CMake)

• USE_PNG = ON (requires PNG library)

• USE_JASPER = ON (requires Jasper library)

• USE_AEC = OFF (not yet supported in CMake)

References

Wesley Ebisuzaki 20170214 EMC seminar on wgrib2api.

Disclaimer

The United States Department of Commerce (DOC) GitHub project code is provided on an "as is" basis and the user assumes responsibility for its use. DOC has relinquished control of the information and no longer has responsibility to protect the integrity, confidentiality, or availability of the information. Any claims against the Department of Commerce stemming from the use of its GitHub project will be governed by all applicable Federal law. Any reference to specific commercial products, processes, or services by service mark, trademark, manufacturer, or otherwise, does not constitute or imply their endorsement, recommendation or favoring by the Department of Commerce. The Department of Commerce seal and logo, or the seal and logo of a DOC bureau, shall not be used in any manner to imply endorsement of any commercial product or activity by DOC or the United States Government.