How can I change from second order to simple packing - ecCodes GRIB FAQ

Step-by-step guide

You may be tempted to try it like this:

% grib_set -s packingType=grid_simple second_order.grib simple.grib

But this will not work and issue errors re codedValues and bitsPerValue! You need to use the repacking option as shown, adding the "-r" option to repack the message:

% grib_set -r -s packingType=grid_simple second_order.grib simple.grib

Also see the code example: grib_precision

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