The use of derivative vegetation indices for the estimation of chlorophyll content in vegetation on the basis of satellite data
|1Kochubei, SM, 1Kazantsev, TA |
1Institute of Plant Physiology and Genetics of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
|Kosm. nauka tehnol. 2011, 17 ;(3):54-59|
|Publication Language: Russian|
The possibility to use derivative vegetation indices for the monitoring of vegetation on the basis of satellite hyperspectral measurements is studied. Soil-vegetation models are employed to calculate the derivative vegetation index D725 /D702 with the use of reflectance spectra of leaves. It is shown that a decrease in spectral resolution down to 10 nm, which corresponds to the maximum value for satellite hyperspectral sensors, causes no significant changes in the D725 /D702 value. Variations of the index lay in the range from 2 to 7 % in the case of full soil covering and do not exceed 16 % for the most complicated model configuration which is 25 % soil covering, a low chlorophyll content and a high soil reflectance. The results are tested practically by analyzing the spectral image of wheat crops obtained with the hyperspectral sensor Hyperion onboard the satellite EO-1. A high correlation is revealed between the reflectance in the green region of the spectra of the wheat crops from the image and the chlorophyll content calculated with the use of the D725 /D702 index.
|Keywords: chlorophyll, hyperspectral measurements, soil-vegetation models|
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