Calculate a normalized index.

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Description

This function returns a normalized difference index value for an arbitrary pair of wavebands.

Usage

1
normalized_diff_ind(spct, plus.w.band, minus.w.band, f, ...)

Arguments

spct

an R object

plus.w.band

waveband objects The waveband determine the region of the spectrum used in the calculations

minus.w.band

waveband objects The waveband determine the region of the spectrum used in the calculations

f

function used for integration taking spct as first argument and a list of wavebands as second argument.

...

additional arguments passed to f

Value

A numeric value for the index

Note

f is most frequently reflectance, but also transmittance, or even absorbance, response, irradiance or a user-defined function can be used if there is a good reason for it. In every case spct should be of the class expected by f. When using two wavebands of different widths do consider passing to f a suitable quantity argument. Wavebands can describe weighting functions if desired.

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