THE NATURE OF TEMPORAL SPECTRAL CHANGES THE REFLECTIVITY OF VEGETATION AND THEIR HYPERSPECTRAL DIAGNOSTICS (REVIEW)
P.E. Kotlyar1, I.A. Pestunov1,2, O.I. Potaturkin1
1Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2Federal Research Center for Information and Computational Technologies, Novosibirsk, Russia
Keywords: reflection spectrum, signature features, vegetation indices, chlorophyll. red edge of photosynthesis, photosynthetic pigments, variation in reflection spectra, stress
Abstract
The review summarizes the results of research into the nature of temporal changes in the spectral reflectance of vegetation. The spectrum of vegetation’s reflective characteristics is considered to be a linear superposition of periodic (vegetation) components, a trend component, and an irregular component. It has been shown that variations in the spectral reflectance of healthy green plants at different phases of the vegetation cycle significantly exceed inter species variations. It has also been shown that the only universally accepted spectral signature of green vegetation is the red edge of photosynthesis - the Red Edge. Analysis of the spectral reflectance of plants in the range λ = 0.4-2.5 μm and its changes over time shows that, with the correct selection of the parameters of the hyperspectral imaging system (spectral resolution of about 2.5 nm and spatial resolution from 5 mm), as well as the timing and frequency of imaging, it is possible to solve a number of practical tasks related to determining the type of plants and their condition.
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