Dear Richard > The CF definitions of discrete sampling geometries define the "trajectory" > feature type as "a series of data points along a path through space with > monotonically increasing times". This is a stricter stance than the usual CF > coordinate definition of "ordered monotonically". What was the reason behind > the addition of the "increasing" constraint, and can it be relaxed? We have > data sets where a model is run backwards in time.
Good point. I would think that "monotonically" would be enough, not necessarily increasing. I can't remember a reason for "increasing"; I assume it's just because sect 9 was conceived for observations in the first place. However, John Caron may well have a comment. I don't think anything prevents your storing the data in the orthogonal multidimensional representation, which existed before sect 9 did and doesn't require increasing coordinates. Best wishes Jonathan _______________________________________________ CF-metadata mailing list CF-metadata@cgd.ucar.edu http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
