grb1to2.pl - grib1 to grib2 converter

• G12 converts GRIB1 to GRIB2-g21 converts GRIB2 to GRIB1-g22 converts GRIB2 to GRIB2 (used to change packing option) Optional packing options: (for use with -g12 and -g22 only)-p0 simple packing-p2 complex packing-p31 complex pack with 1st order diffs-p32 complex pack with 2nd order diffs-p40 JPEG2000 encoding.
• G2n is designed to convert GRIB and GRIB2 files into NetCDF format. Typically g2n is used in numerical weather prediction (NWP) applications where the analyses are often provided in GRIB format. Although GRIB can be converted using other methods, g2n is useful for also combining the two-dimensional GRIB data into three-dimensional fields.

Yes, there is a cnvgrib1to2 utility. It sort of works, but not always, since not all grib1 messages can be converted to grib2 (since there isn't always enough information in a grib1 message to define how to do the conversion).

Grb1to2.pl converts grib1 files to grib2. This perl script uses wgrib, wgrib2 and a few minorprograms that are included with the wgrib2 package (gmerge, smallest_grib2). Here are someof the advantages of grb1to2.pl,

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• Easier than some other solutions to compile.
  Many repositories include wgrib2 executables
  wgrib, gmerge and smallest_grib2 are very easy to compile C programs
• More fields converted than some other solutions. Easy to modify code for new fields.
• Does c0 packing, the smallest of 3 different complex packings.
• Complex packing algorithms produce fast-to-read grib2 files which are comparable in size to jpeg2000 packing.
• Fast packing option which is optimized for 4-core CPUs

Disadvanges are

• Only partial ensemble metadata support
• POSIX required
• limited to lat-lon, polar stereographic, Lambert conformal, Mercator, and Gaussian grids
• other grids can be handled if the appropriate grib2 template is supplied.
• Does not convert from grib2 to grib1.
• Quits when finds a problem grid. You need to alter perl script to handle grid before continuing.
• Only simple scan mode options are handled, latlon: we:sn and we:ns, others: we:sn (needs to improved)

Requirements are

• wgrib2 with IPOLATES enabled (-new_grid option)
• wgrib
• gmerge and smallest_grib2, only needed by -fast and -packing c0 (default), supplied in the aux_progs directory of wgrib2
• perl
• POSIX2 environment

History

Grb1to2.pl is based on code that was written in 12/2009 at CPC and versionsof the code are being used at CPC. Variants of the code were written for (1) speed, the (2) large files, (3) ease of updating and/or (4) potential operational usage. The latest version (4/2014) had a name change (grib1to2 had been taken),large file support was dropped (not needed with a 64-bit OS) and most importantlyinstallion was made easier by eliminating the need for cnvgrib. Thisversion retains radius of the earth from the grib1 file unlike the previousversions.

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Changes

How it works

grb1to2.gs works by

Grib1 To Grib2 Converter Box Free

1. interpolating the generic template file to the same grid as the grib1 file to make the grib2 template
2. adding metadata (center, subcenter, process, shape of earth) to the template
3. converting grib1 file to binary
4. making a simple inventory of grib1 file (inv1)
5. making a long inventory of grib1 file (inv2)
6. grib1to2_metadata.pl combines inv1 and inv2 to make a metadata file (wgrib2 inv + extra fields)
7. wgrib2 converts binary data + metadata + template into a grib2 file

Usage

Example

This example uses the best compression (complex1,complex2, and complex3); however, it requires more CPU time.The new grib2 file is pgb.20190729.grb2.This example converts to complex packing 3. It uses less CPU and does notrequire installation of gmerge and smallest_grib2. The grib2 file is largerthan the best of the complex packings.

Old Installation: grb1to2.pl versions prior to 12/2015

Grib1 To Grib2 Converter Box Wiring

The basic installation consists of wgrib, wgrib2+aux_progs and 3 new files. (See)Wgrib2 needs to be compiled with the IPOLATES option. (See wgrib2 documentation.) You need to installthe various files in the $HOME/bin or $HOME/bin_data/ directories. ($HOME is a an environment variablethat refers to your home directory.)

1. $HOME/bin/gmerge (included with wgrib2), see grib2/aux_progs of the wgrib2 compilation directory
2. $HOME/bin/small_grib2 (included with wgrib2), see grib2/aux_progs of the wgrib2 compilation directory

You can also modify global_template.g2 to add sitespecific metadata.

New Installation: versions after 12/2015

The following files have to be placed in the same directory as grb1to2.pl. With the12/2015 version, any account can run an installed version of grb1to2.pl.

1. wgrib2
   wgrib2 needs to be compiled with the IPOLATES option so that the -new_grid option works. See the wgrib2 documentation.
2. gmerge (included with wgrib2), see grib2/aux_progs of the wgrib2 compilation directory
3. small_grib2 (included with wgrib2), see grib2/aux_progs of the wgrib2 compilation directory

Comments: Wesley.Ebisuzaki@noaa.gov, updated 1/27/2016, 11/04/2014, 12/3/2015