Ascii ArcInfo Grid
The -AAIG option writes the data into a Ascii ArcInfo Grid file.
This option is experimental and only supports equally spaced lat-lon grids.
My reading of the format specifications that each file contains a single grid.
Therefore, each field is written to different file (*.asc) which
is written to the current directory.
File name convention for ouput: *.asc
The file name convention
NAME = grib name (-var), ex. TEMP, HGT
LEVEL = level, ex. surface, 2_m_above_ground, 500_mb
RT = reference time YYYYMMDDHH
VT = verification time (end_ft) YYYYMMDDHH
If RT is the same as VT
output = NAME.LEVEL.RT.asc
If RT is different than VT
output = NAME.LEVEL.RT.VT.asc
Problems with file name convention
The above file name convention works for a simple GFS forecast.
However, life quickly gets more complicated and a new file name
convention was needed (-AAIGlong).
wgrib2 in_file -match ':HGT:400 mb:' -AAIG
The above line converts all the 400 mb HGT fields into an
arcinfo ascii grid file.
See also: -AAIGlong,