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The key stepUnits is a transient key and it is not written in the GRIB message. So, you cannot expect to get the same stepUnits as when you have encoded the data. By convention, when encoding, ecCodes will choose the best unit to encode the step in so that it fits the space available in the grib message. When decoding, ecCodes will return the step in hours by default. |
The key stepUnits is a transient key and it is not written in the GRIB message. So, you cannot expect to get the same stepUnits as when you have encoded the data. By convention, when encoding, ecCodes will choose the best unit to encode the step in so that it fits the space available in the grib GRIB message. When decoding, ecCodes will return the step in hours by default.
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Note: The "step" key (as well as startStep, endStep and stepRange) were added purely for the MARS system here at ECMWF and MARS only deals with steps in units of hours. |
The stepUnits can only be set in the following situations:
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One can also set values in a grib GRIB message before printing its contents with tools like grib_ls and grib_get.:
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% grib_ls -s stepUnits="m" -p startStep,endStep,stepRange,stepUnits:s,stepType out.grib |
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