Dear Dan > We have several variables that we describe loosely as 'days of rain'. > Strictly speaking they are a count (e.g. for a calendar month) of the number > of days when the 24-hour precipitation total was greater than or equal to a > threshold. We currently generate grids for three thresholds - 0.2mm, 1.0mm > and 10.0mm. My intention is to use the following existing standard name: > > number_of_days_with_lwe_thickness_of_precipitation_amount_above_threshold > > My only slight problem is that the definition implies 'greater than' whereas > our variables are 'greater than or equal to' the threshold. Assuming the > observations have a precision of 0.1 mm ...
I think it depends on how the data have been treated. Are they rounded to the nearest 0.1 mm? If so, a recorded value of 0.0 mm means an actual value in the range 0.00-0.05 mm, 0.1 mm means 0.05-0.15 mm, 0.2 mm means 0.15-0.25 mm, etc., and your threshold of 0.2 mm in recorded precipitation is actually a threshold of 0.15 mm. That is therefore what I would suggest as the coordinate value for the threshold. Best wishes Jonathan _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
