-scale¶

Introduction¶

In grib, grid values are usually stored as

  grid_value = (ref_value + I*2**bin_scaling)) * 10**decimal_scaling.
    ref_value = 32-bit IEEE floating point number
    I is a positive integer
    binary_scaling = -127..127
    decimal_scaling = -127..127

This is not an absolute as the grid point values can be stored as a spectral coefficients, IEEE floating point values and other formats. The -scale option prints the binary and scaling factors.

Usage¶

-scale

Example¶

bash-4.1$ wgrib2 gep19.t00z.pgrb2af180 -scale -for 13:14
13:473374:scale=-3,4
14:528630:scale=-1,0
bash-4.1$ wgrib2 gep19.t00z.pgrb2af180 -scale -for 13:14 -v -packing
13:473374:scale=-3,4:packing=grid point data - jpeg2000 compression,j val=(2.32109e+06+i*2^4)*10^-3, i=0..65535 (#bits=16)
14:528630:scale=-1,0:packing=grid point data - jpeg2000 compression,j val=(2215+i*2^0)*10^-1, i=0..1023 (#bits=10)