The chlorophylls have strong reflectance peaks in the red and blue wavelength regions. Blue peak is not used to estimate the chlorophyll content because it overlaps with the absorbance of the carotenoids. Maximal absorbance in the red region occurs between 660 nm and 680 nm. However, it is unknown if reflectance at these wavelengths can be used to predict chlorophyll content as reflectance at slightly longer or shorter wavelengths. This is because absorption in the 660–680 nm tends to saturate at low chlorophyll content, thus reducing the sensitivity of the spectral indices based on these wavelength to high chlorophyll content. Empirical models to predict chlorophyll content are largely based on reflectance around the 550 nm or 700 nm regions where the absorption is saturated at higher chlorophyll. Indices formulated with these bands would thus have higher accuracy in estimating chlorophyll content.