It may be run on GRIB files to horizontally interpolate the data from one grid to another.The MET tools which compare gridded forecasts to gridded observations (Grid-Stat, Wavelet-Stat, Ensemble-Stat and, MODE) require that the input forecast and observation data be on the same grid.Therefore the COPYGB tool is very useful in preparing your gridded data for use in MET.In this tutorial, well focus on the simplest types of horizontal interpolation using the default interpolation options.
For a full description of these command line options, please see the copygb.doc COPYGB documentation file. For further options please see the documentation of the ecCodes command line GRIB tools Example 2: List data for closest point(s) For a given coordinate, for example (lat46.87 lon8.73), list data of the closest model point: gribls -l 46.87,8.73,1 -p dataDate,dataTime,validityDate,validityTime myfile.grib. giving this output. If your software supports only NetCDF or if you run into problems with GRIB, use the NetCDF format. Introduction The GRIB file format is designed for storing and distributing weather data. GRIB files are widely used in meteorological applications ( Wikipedia article, including a list of software to read GRIB files). GRIB stands for General Regularly distributed Information in Binary form and is a WMO (World Meteorological Organisation) standard format for archiving and exchanging gridded data. GRIB is a binary format, and the data is packed to increase storage efficiency. GRIB messages are often concatenated together to form a GRIB file. GRIB files usually have the extension.grib,.grb or.gb. Currently there are two different coding standards: GRIB edition 1 (commonly referred to as GRIB1 ) and GRIB edition 2 ( GRIB2 ). The major differences are in the structure of the messages; in GRIB2, several variables are defined with more precision (e.g. GRIB1, latitudes and longitudes are in milli-degrees while in GRIB2, they are in micro-degrees). Also in GRIB2, longitude values must lie between 0 and 360 degrees), the encoding of the parameter is very different, and in GRIB2 the description of the data is templatetable based. Note that a GRIB file can contain a mix of GRIB1 and GRIB2 messages. Please see the WMO Introduction to GRIB Edition 1 and GRIB Edition 2 documentation for further details. The ECMWF model (the Integrated Forecasting System, IFS) currently outputs model-level fields in GRIB2 while pressure and surface level outputs are produced in GRIB1. For example, ERA-Interim (a climate reanalysis dataset provided by ECMWF) is produced in the GRIB edition 1 format. The ERA-Interim data is then made available for download in its native GRIB format. GRIB conversion to netCDF In some cases, data is also available in NetCDF format as the result of the conversion of the GRIB file to NetCDF. Note that due to this conversion, not all the information in the GRIB file will be included in the NetCDF version, and his is particularly true for the GRIB file metadata. At this time, the NetCDF format is not formally supported by ECMWF. This software package has an Application Program Interface which makes ECMWF GRIB1 and GRIB2 files accessible from C, FORTRAN and Python programmes. Metview is a software tool from ECMWF which allows users to read, process and visualise GRIB 1 and GRIB 2 data (see Metview documentation). Grib1 To Grib2 Converter Boxes Code Examples ForCommon GUI tools for reading and visualising GRIB files are: Panoply by NASA MetView by ECMWF Integrated Data Viewer (IDV) by UCAR unidata zyGRIB ArcGIS by ESRI For users comfortable with command line tools: ecCodes by ECMWF Supports GRIB to NetCDF conversion (gribtonetcdf -o netcdffile gribfile) Supports GRIB to JSON (gribdump -j ) See tools and code examples for Fortran, Python and C CDO info operators (info, infon, sinfo, sinfon) NCO GrADS wgrib2, only for GRIB edition 2, wgrib2 can not decode GRIB edition 1 files IDL the GDAL library, with limited support for coordinate systems, georeferencing and metadata. In particular irregular (non-cartesian) coordinate systems might not be decoded correctly. ![]() Grib1 To Grib2 Converter Boxes Install ECMWFs EcCodesPreparation: Get a computer running Linux On your Linux computer install ECMWFs ecCodes software Get some data in GRIB format (for example from the CAMS or C3S Service). For this use case, we assume the file contains forecast data, and surface data (ie. For further options please see the documentation of the ecCodes command line GRIB tools Example 2: List data for closest point(s) For a given coordinate, for example (lat46.87 lon8.73), list data of the closest model point: gribls -l 46.87,8.73,1 -p dataDate,dataTime,validityDate,validityTime myfile.grib.
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