wgrib2: -undefine_val
Introduction
The -undefine_val option sets the grid points to undefined
depending on the value of the grid point. If a single value is specified, grid
values within 0.1 percent are set to undefined. If two values are specified,
the values that are within that range are set to undefined.
Note: the ability to handle ranges was always available but undocumented.
My mistake. That's what you get when you delay writing the documentation.
Usage
-undefine_val value
grid values within 0.1 percent are set to undefined
-undefine_val "value1:value2"
grid value that are within the rage are set to undefined
i.e., value1 <= grid_value <= value2
Example
Suppose a non-standard grib file uses -999.9 as special value to
indicate an undefined grid point value. This is unfortunate as grib
readers will not know that -999.9 is a special value for undefined
values. (Grib2 uses a bitmap, NaN or out-of-range values.)
The best way to deal with these files is to convert
values of -999.9 to undefined values and then write them out.
$ wgrib2 IN.grb2 -undefine_val -999.9 -set_grib_type same -grib_out OUT.grb
See also:
-undefine,
-ijundefine,
-rpn,
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