hi: Huglin Heliothermal Index (HI)

In rsnotivoli/agroclim: Climatic Indices for Agriculture

Description

Huglin Heliothermal Index (HI). Useful as a zoning tool (Huglin 1978).

Usage

hi(mx, mn, dates, lati)

Arguments

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.

Details

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).

Value

A numeric vector with annual values is returned.

References

Huglin P. (1978) Nouveau mode d'evaluation des possibilities heliothermiques d'un milieu viticole. CR Acad Agr 64: 1117–1126

Examples

  hi(mx = daily_tmax,
    mn = daily_tmin,
    dates = seq.Date(as.Date('1981-01-01'),
            as.Date('2010-12-31'), by ='day'),
            lati = 42)

rsnotivoli/agroclim documentation built on March 21, 2020, 12:22 a.m.