Using a set of light level data from a known location create a calibration function to return the expected light level given solar elevation.
mkCalibration(x, known = NULL, elim = c(-36, 12), choose = TRUE)
A function, defined by approxfun
.
a data frame containing at least gmt
and light
a known position - as a 2-element c(x, y)
coordinate
a 2-element vector of the range of solar elevation to define
logical - choose segments from a plot or use all the data?
Michael D. Sumner
It is assumed that the data frame x
has columns "gmt" with POSIXct
date-times and "light" with numeric light level data.