cre.daily: Calculates crop reference evapotranspiration from daily data

In ilyamaclean/ecohydrotools: hydrogical modelling for ecological applications with R

Description

cre.daily applies the Penman-Monteith equation to derive hourly crop reference evapotranspiration

Usage

cre.daily(Rn, tmin, tmax, u1, rhmin, rhmax, p)

Arguments

Rn	a single numeric value, vector, two-dimensional array or matrix of net radiation (MJ / m^2 / day)
tmin	a single numeric value, vector, two-dimensional array or matrix of daily minimum temperature (deg C)
tmax	a single numeric value, vector, two-dimensional array or matrix of daily maximum temperature (deg C)
u1	a single numeric value, vector, two-dimensional array or matrix of wind speed at one metre above the ground (m /s)
rhmin	a single numeric value, vector, two-dimensional array or matrix of daily minimum relative humidity (percentage)
rhmax	a single numeric value, vector, two-dimensional array or matrix of daily maximum relative humidity (percentage)
p	a single numeric value, vector, two-dimensional array or matrix of pressure (Pa)

Details

Applies the method detailed in Allen et al (1998). If relatively fine-resolution spatial data are needed, radiation, temperature, wind and relative humidity can be downscaled using the microclima package. Humidity conversions can also be performed using this package. If only sea-level pressure is known, then p can be derived using function pressure.height(). To convert radiation from watts m^-2 to MJ m^-2 day^-1 multiply by 0.0864.

Value

a single numeric value, vector, two-dimensional array or matrix of crop reference evapotranspiration (mm / day)

See Also

cre.hourly for deriving crop reference evapotranspiration from hourly data

Examples

cre.daily(13.2, 10, 20, 1.3, 60, 100, 101300)

ilyamaclean/ecohydrotools documentation built on June 10, 2019, 5:45 a.m.