Dear Jim > I have a situation where there are multiple measurements within a 4D > lon/lat/z/t volume, for which a single value is produced by > calculating the weighted mean of all the measurements. This mean is > of the form > > (sum over i of wi * vi) / (sum over i of wi) > > where wi is the inverse of the uncertainty in the measurement vi. > > So how do I represent that within cell_methods? Would it be > > lon lat z t: mean (uncertainty weighted)
That's the idea, assuming lon lat z t are the names of the four dimensions. The format is actually "lon: lat: z: t: mean" (see 7.3.1). There is no standardised way to record weighting, but it's fine to use a commment for that, as you show. Cheers Jonathan _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
