numberOfDataPoints: This is the total number of points on the grid and includes missing as well as 'real' values
numberOfValues (=numberOfCodedValues): These two keys are the same (one is an alias for the other). This is the number of 'real' values in the field and excludes the number of missing ones
numberOfMissing: You guessed it. The number of missing values in the field
So you can write the equation:
numberOfDataPoints = numberOfCodedValues + numberOfMissing
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