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" <caron at unidata.ucar.edu>
Til: cf-metadata at cgd.ucar.edu
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 B?nes 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
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Received on Tue Nov 15 2011 - 07:38:36 GMT
