nsr: Calculate Normalized Simple Ratio (NSR) index.

In kang-yu/visa: Vegetation Imaging Spectroscopy Analyzer

Calculate Normalized Simple Ratio (NSR) index.

Description

It is a normalization of SR by doing NSR = (1-SR)/(1+SR), with the same two spectral bands.

Usage

nsr(s, b1, b2)

lm.nsr(s, b1, b2, y)

Arguments

s	Spectral data in the format of visa's Spectra object, spectra.dataframe or spectra.matrix.
b1	A integer number which defines the wavelength of the 1st spectral band.
b2	A integer number which defines the wavelength of the 2nd spectral band.
y	A numeric variable to correlate with SR

Details

As it exactly reads in its name, it is a normalization of the SR and ranges in (0,1).

Value

nsr	Returns a NSR index.
p	Returns a ggplot object.

Examples

s <- NSpec.DF$spectra
nsr1 <- nsr(s, 480, 550)

s <- NSpec.DF
y <- NSpec.DF$N
lm.nsr(s,600,500,y)

kang-yu/visa documentation built on June 11, 2025, 1:36 a.m.