The -Match_inv option is identical to
-match_inv except the "d=YYYYMMDDHH" and
"D=YYYYMMDDHHmmss" fields are swapped in the inventories.
The wgrib2api uses -Match_inv option to create
Wgrib2 inventories can be used as index files and as metadata
to create grib files. For index files, the -match_inv
makes a fine index file as it exposes a number of important parameters
that you may want to search upon. The problem with using these
files for metadata for creating grib files is that it uses a reference
time of "d=YYYYMMDDHH". Some applications require a reference time
that includes minutes (mm). The -Match_inv option
uses a reference time of "D=YYYYMMDDmmss" which solves this problem.