R: Reference Evapotranspiration Using Hargreaves-Samani Method

ET0_HS {CropWaterBalance}

R Documentation

Reference Evapotranspiration Using Hargreaves-Samani Method

Description

Calculates daily reference evapotranspiration amounts using the Hargreaves-Samani method.

Usage

ET0_HS(Ra, Tavg, Tmax, Tmin)

Arguments

`Ra`	A `vector`, 1-column `matrix` or `data.frame` with extraterrestrial solar radiation in MJ m-2 day-1.
`Tavg`	A `vector`, 1-column `matrix` or `data.frame` column with daily average air temperature.
`Tmax`	A `vector`, 1-column `matrix` or `data.frame` with daily maximum air temperature in Celsius degrees.
`Tmin`	A `vector`, 1-column `matrix` or `data.frame` with daily minimum air temperature in Celsius degrees.

Value

A matrix of 1-column with the same length as 'the input values with the daily potential evapotranspiration values in millimetres.

Examples

# See `?DataForCWB` for more on this data set
Tavg <- DataForCWB[, 2]
Tmax <- DataForCWB[, 3]
Tmin <- DataForCWB[, 4]
Ra <- DataForCWB[, 5]
ET0_HS(Ra = Ra, Tavg = Tavg, Tmax = Tmax, Tmin = Tmin)