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tripEstimation (version 0.0-46)

mkCalibration: Create calibration of solar elevation to measured light level.

Description

Using a set of light level data from a known location create a calibration function to return the expected light level given solar elevation.

Usage

mkCalibration(x, known = NULL, elim = c(-36, 12), choose = TRUE)

Value

A function, defined by approxfun.

Arguments

x

a data frame containing at least gmt and light

known

a known position - as a 2-element c(x, y) coordinate

elim

a 2-element vector of the range of solar elevation to define

choose

logical - choose segments from a plot or use all the data?

Author

Michael D. Sumner

Details

It is assumed that the data frame x has columns "gmt" with POSIXct date-times and "light" with numeric light level data.

See Also