resampling_FWHM {CWT}

Full Width Half Maximum Resampling

Description

It resample spectra data using Full Width Half Maximum (FWHM).

Usage

resampling_FWHM(spectra, wavelengths, new_wavelengths, FWHM, threads = 1L)

Arguments

spectra

A data.table, data.frame, or matrix where columns represent bands and rows samples (i.e., pixels).

wavelengths

A numeric vector describing the current positioning of the spectral bands within spectra.

new_wavelengths

A numeric vector describing positioning of the new spectral bands to resample.

FWHM

A numeric vector describing the Full Width Half Maximums of the new spectral bands. The length of this vector should be equal than the length of new_wavelengths.

threads

An integer specifying the number of threads to use. Experiment to see what works best for your data on your hardware.

Value

It returns a data.table with the resampled spectra, where columns are the new bands and rows are samples.

Author(s)

J. Antonio Guzmán Q.

Examples

mean <- 50
sd1 <- 5
sd2 <- 10
n <- 100

test <- matrix(c(dnorm(1:n, mean = mean, sd = sd1),
               dnorm(1:n, mean = mean, sd = sd2)),
               nrow = 2,
               byrow = TRUE)

current_bands <- 1:n
new_bands <- seq(10, 90, by = 5)
FHWM <- rep(5, length(new_bands))

resampling_FWHM(spectra = test,
                wavelengths = current_bands,
                new_wavelengths = new_bands,
                FWHM = FHWM)