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One way is to use grib_set with the key "scaleValuesBy". Let's say you have a field in orig.grib whose values you want to multiply by 2.1. First check the original data value statistics |
How can I multiply the field values by a constant?
Step-by-step guide
One way is to use grib_set with the key "scaleValuesBy". Let's say you have a field in orig.grib whose values you want to multiply by 2.1. First check the original data value statistics:
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You could have also checked the statistics by "grib_ls -n statistics orig.grib".
Now let's scale all values up by a factor of 2.1:
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% grib_set -s scaleValuesBy=2.1 orig.grib out.grib |
And check the new values after the multiplication:
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% grib_ls -p min,max,avg out.grib
min max avg
492.563 655.376 585.853 |
For adding or subtracting a constant, you can use the key "offsetValuesBy".
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