[gradsusr] Counting calculation in the grads command line

[Davide Sacchetti]

let's try:

D TEMP shows you temperature for 1 month

D CONST(TEMP,1) shows you a constant field with value 1 on the grid of
TEMP

D MASKOUT(CONST(TEMP,1),TEMP-293) shows you the same constant field but
ONLY where TEMP exceeds 293K

if you have 12 months ...:
D SUM(MASKOUT(CONST(TEMP,1),TEMP-293),T=1,T=12)
shows you the number of months exceeding 293 during the year


it should work
bye bye
Davide

On Thu, 2014-08-14 at 13:23 +0900, Robert Macnee wrote:
> Hi all,
> 
> 
> I have monthly temperature climate data and would like to do a
> calculation in the Grads command line to count the number of months in
> which the temperature is above a certain threshold for a defined
> timeslice (1 year). Basically, I want the output map to display the
> number of months in a given year that the temperature exceeds a
> threshold value (e.g. 20 degrees c / 293K).
> 
> 
> My knowledge of the commands isn't very good so can anyone suggest to
> me how to do this? 
> 
> 
> Thanks,
> 
> 
> Robert
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-- 
Davide Sacchetti
Centro Funzionale Meteo Idrologico di Protezione Civile della Regione Liguria
ARPAL Unità Tecnica Complessa di livello Regionale
V.le Brigare Partigiane 2 16121 Genova (I)
tel: +39 010 6437535                    fax: +39 010 6437520
mail: davide.sacchetti at arpal.gov.it     web: www.meteoliguria.it