-import_grib_fs (wgrib2 v3.0.0+)¶

Introduction¶

The -import_grib_fs option sets the file pointer to the beginning of the file, and reads sequentially until it finds a record that matches the search string. It like a -if_fs for reading a grib file.

The -import_grib_fs option is more useful verion of -import_grib.

Usage¶

-import_grib_fs STRING data.grb      reads a grib message that matchs STRING from file data.grb
                     the match is by fixed string, not regular expression
                                     -g2clib 2 is not supported
                                     conversion to we:sn and we:ns is supported
                                     starts at the beginning of the file
                     reads sequentially
                                     -not and -match do not affect -import_grib

Note: grid size (if it can be determined) must match the current grid.

Example 1¶

wgrib2 IN.grb -bin dump.bin              .. make a binary sequential file of the fields
Fix.sh dump.bin dump.bin.new             .. alter dump.bin
wgrib2 IN.grb -set_grib_type same -import_bin dump.bin.new -set_scaling same same -grib_out IN.new.grb

The -import options reads the data for one field and overwrites the current grid point values. The -grib_out option writes a new grib message with the new grid point values.

Example 2: using import to write a grib file¶

template.grb2             is a single message (field/record) grib2 file with the appropriate grid
                          usually a simple type like 6 hour forecast or analysis
new.bin                   is a binary file with a single field with th same grid as template.grb2


wgrib2 template.grb2 -import_bin new.bin -set_var TMP -set_lev "2 m above ground" -set_ftime "anl" \
     -set_date 1999123112 -grib_out new.grb2

This commands writes new.bin as a grib2 file as TMP2m analysis at 12Z Dec 31, 1999.