-AAIG¶

Ascii ArcInfo Grid¶

Introduction¶

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).

Usage¶

-AAIG

Example¶

wgrib2 in_file -match ':HGT:400 mb:' -AAIG

The above line converts all the 400 mb HGT fields into an arcinfo ascii grid file.