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The fill value of a variable should be a number outside its valid data range. |
Recommendation Details: The CF _FillValue attribute is used to indicate missing or invalid data for a variable. Also, the value of the CF _FillValue attribute should match the actual fill value used for the variable in the file.
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There should only be one fill value per variable. We recommend using a quality flag variable along with the CF flag_values and flag_meanings attributes to explain the various reasons for using the fill value, instead of using several special values in the variable.
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This recommendation has been finalized by DIWG but has not yet received final ESO approval. |
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