Hi John, All the assumptions you state are correct.
Regarding the usage of the data, there exists a specialized application that uses this data. The problem is that others are interested in the same data, and I have no control over how they will use it. Because of that, I want the generated file to follow any standards as closely as possible. -- Vegard ----- Original Message ----- Fra: "John Caron" <[email protected]> Til: [email protected] Sendt: 15. november 2011 14:38:24 Emne: Re: [CF-metadata] standards for probabilities Hi Vegard: I see some of these kinds of things from NCEP, encoded in GRIB, and Im still trying to understand what they are. So, some questions from a non-modeler: On 11/15/2011 2:10 AM, Vegard Bønes wrote: > Hi! > > I am trying to create a document containing various probability values for > weather forecasts. But I do have some problems finding out how to express > what I want to say using the cf metadata standard. > > I want to express such things as "25th percentile precipitation amount" > (based on ensemble data), and probability that air temperature will be within > 2.5 degrees of the forecast. How should I do this? these are 2 different things, i guess? 1) "25th percentile precipitation amount" (based on ensemble data) * so here the data values are precip amounts? calculated from the cumulative distribution function (cdf) from an ensemble? * do you typically have other percentile amounts in the same file, eg 50 and 75? * presumably this is some distillation of the cdf, used when the individual ensemble values are not in the file? * is there any special handling that a generic tool could do, or is it a matter a just making this data available to some specialized application that you write? 2) probability that air temperature will be within 2.5 degrees of the forecast * so here the data values are probabilities between 0 and 1 ? * do you typically have other probabilities in the same file, eg within 1 degree, or 5 degrees? * is there any special handling that a generic tool could do with such info? john _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
