Nothing

```
## Code for splice-correction
##
#
# x a vector
# y the wavelengths
# wl the wavelengths at which the splice correction should take place
#
# ASD version is using cubic splines
#
# The SWIR part of the spectrum (1000-1800 nm) is taken as a reference
# for corrections as it is stable to the instrument sensitivity drift
# (Beal & Eamon, 2010)
#
# http://support.asdi.com/Document/Documents.aspx
#
# x and y giving the coordinates of the points to be interpolated
# x: wavelengths
# y: NIR value at these wavelengths
splice.numeric <- function(x, y, wl = c(725:1020, 1801:1950), method = "spline") {
# Getting index of WLs to be interpolated
idx <- which(x %in% wl)
y_cutted <- y[-1*idx]
x_cutted <- x[-1*idx]
# Interpolation
r <- interp1(x = x_cutted, y = y_cutted, xi = x, method = method)
r
}
splice.Spectra <- function(x, wl = c(725:1020, 1801:1950), method = "spline") {
nir <- apply_spectra(x, function(spec) {
splice.numeric(x = wl(x), y = as.vector(spec), wl = wl, method = method)
})
}
# if (!isGeneric("splice"))
setGeneric("splice", function(x, wl, method="spline")
standardGeneric("splice"))
setMethod("splice",
signature(x="Spectra"),
function(x, wl = c(725:1020, 1801:1950), method = "spline") {
splice.Spectra(x, wl, method)
}
)
```

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