hi | R Documentation |
Huglin Heliothermal Index (HI). Useful as a zoning tool (Huglin 1978).
hi(mx, mn, dates, lati)
mx |
vector of daily maximum temperature series. |
mn |
vector of daily minimum temperature series. |
dates |
vector of dates corresponding with daily temprature series |
lati |
numeric value indicating the latitude of location. |
Depending on the latitude, the function detects the hemisphere and considers growing season from 1st April to 30rd September (northern hemisphere) or from 1st October to 31st March (southern hemisphere).
A numeric vector with annual values is returned.
Huglin P. (1978) Nouveau mode d'evaluation des possibilities heliothermiques d'un milieu viticole. CR Acad Agr 64: 1117–1126
hi(mx = daily_tmax, mn = daily_tmin, dates = seq.Date(as.Date('1981-01-01'), as.Date('2010-12-31'), by ='day'), lati = 42)
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