NSpec.DB                Example data in the Spectra/SpectraDatabase
                        format.
NSpec.DF                Example data in the SpectraDataFrame format
Spectra-class           Create a Spectra or SpectraDatabase
SpectraDataFrame-class
                        Class 'SpectraDataFrame'
SpectraDatabase-class   Class 'SpectraDatabase'
SpectraMatrix-class     Class 'SpectraMatrix'
as.spectra.data.frame   Create a SpectraDataFrame
cm.nsr                  Selecting the best 2-Band combinations for
                        Normalized Simple Ratio (NSR)
cm.sr                   Selecting the best 2-Band combinations for
                        Simple Ratio (SR)
ggplot                  Create a new ggplot plot with a geom_line()
                        layer from spectra data
ggplot-method           Plot functions
ndvi2                   Calculate and plot a 2-band NDVI.
spectra                 Access the spectra data of 'SpectraDatabase'.
sr                      Calculate Simple Ratio (SR).
wavelength              Access the wavelength of Spectra
