Dear Vegard > A dimension (and variable) for specifying percentiles: > float percentile(percentile) ; > percentile:units = "1" ; > percentile:standard_name = "cumulative_distribution_function" > ; > float air_temperature_percentiles(time, percentile, latitude, > longitude) ; > air_temperature_percentiles:units = "K" ; > air_temperature_percentiles:standard_name = "air_temperature" > ;
This looks sensible to me. Are you proposing cumulative_distribution_function as a new standard name? > ...an alternative for percentile could be > cumulative_distribution_function_over_realization. Yes. That would be more informative, and therefore preferable, I think. > Then, there is the problem of certainty that a temperature will be within a > given range. Could you do that like this: float air_temperature(air_temperature); air_temperature:bounds="air_temperature_bounds"; air_temperature:units="K"; float air_temperature_bounds(air_temperature,2); float air_temperature_confidence(time,air_temperature,latitude,longitude); air_temperature_confidence:standard_name="probability"; Then the air_temperature_bounds specify the ranges of air temperature for which the probability is evaluated. probability would be a new standard name as well. Again it could be made more informative as something like probability_over_realization. This is instead of a standard_name modifier and seems more consistent to me with the treatment of percentile. It is a kind of transpose. > Also, which I did not mention in the previous emails, I also wanted to > express the probability of at least x mm of precipitation. This can be done in the same way as the probability of air temperature ranges, with the upper bounds for precipitation ranges set high enough that they are effectively infinite. > When working with this, I found that expressing percentiles and > probabilities as dimensions, instead of attributes, made the relationship > between them more intuitive. I agree. Cheers Jonathan _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
