-ijbox¶

Introduction¶

The -ijbox option takes a rectangular box of data from a rectanular grid an writes it out in either text, bin, or spread (sheet) format. The extracted box can have every point or every n-th point.

Usage¶

-ijbox i1:i2:di j1:j2:dj output_file format
     format = bin, text or spread   (format of output_file)

     The data in output_file is written out as
      do iy=j1, j2, dj
         do ix=i1, i2, di
            data(ix,iy)
         enddo
      enddo

    Note: -big_endian and -little_endian have no effect the bin type output

Example¶

Wgrib2 when writing binary, can make a fortran header at the beginning of the grid and a fortran trailer at the end of the grid. I wanted to create a file with fortran header and trailer surrounding each row of the grid. I was able to do it with -ijox. The grid of rtgssthr_grb2 is 1041 x 441.

rm output
i=1
while [ $i -le 441 ] ; do
   wgrib2 rtgssthr_grb2 -append -header ijbox 1:1041 $i:$i output bin
   i=`expr $i + 1`
done

See also: -undefine, -small_grib, -text_col,

Description: out X..Z,A grid values in bounding box X=i1:i2[:di] Y=j1:j2[:dj] Z=file A=[bin|text|spread]

Docs derived from https://www.cpc.ncep.noaa.gov/products/wesley/wgrib2/ijbox.html