growdh: Growing Degree Hours Calculator
In springpheno: Spring Phenological Indices

Description Usage Arguments Value Author(s) References Examples

View source: R/springpheno_v0.4.R View source: R/springpheno_v0.5.R View source: R/springpheno_v0.3.R

Given appropriate inputs, this function calculates the growing degree hours for a given day and locations. The formula is also retained from the original Matlab code for the extended spring indices (SI-x, Ault et al. 2015).

1	growdh(tmax, tmin, daylen, baset)

`tmax`	Scalar - daily high temperature (degrees Fahrenheit) for a given day
`tmin`	Scalar - daily low temperature (degrees Fahrenheit) for a given day
`daylen`	Scalar - day length for a given day (calculated from daylength function)
`baset`	Scalar - base temperature for determining growing degree hours. Typically this 31 degrees Fahrenheit

GDHOUR - scalar, total growing degree hours for a given day.

Adrienne M. Wootten (University of Oklahoma)

Ault, T.R., R. Zurita-Miller and M. Schwarz, 2015: A Matlab© toolbox for calculating spring indices from daily meteorological data. Computers and Geosciences, 83, DOI: 10.1016/j.cageo.2015.06.015

daystop <- 366
lat <- 35.476 # latitude for OKC
daylen <- daylength(daystop=daystop,lat=lat)

tmax <- 65
tmin <- 42
dlen <- daylen[60]
bt <- 31

result <- growdh(tmax,tmin,dlen,bt)