8 February 2001 Hyperspectral reflectance measurements for estimating eco-physiological status of plants
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Abstract
An AOTF-based spectral imager was developed for hyperspectral measurement of plant reflectance in the field. A hyperspectral image cube for the spectral region between 450 nm-900 nm can be obtained at 3 to 5 nm resolution intervals within a few seconds. The system is light and compact, and both the spectral wavelengths and intervals are programmable with PC control. Wavelengths can be rapidly tuned, either sequentially or randomly. Hyperspectral measurements were taken over plant leaves and canopies using the AOTF system and a high-resolution radiometer. Both the leaf nitrogen and chlorophyll contents of the rice canopies were well estimated by multiple regression of high- resolution data in the visible and near-IR regions. A weak signal at 970nm and its normalized indices were found to be useful for estimation of leaf water content. An approach of model inversion was enabled by the use of hyperspectral data. A close and linear relation was found between measured and retrieved water contents. Further, an analysis based on concurrent measurements of hyperspectral reflectance and canopy gas exchange by eddy-covariance method suggested the potential of normalized weak signal for the spectral assessment of canopy CO2 uptake. The hyperspectral reflectance measurement has great potential for estimating the ecological and physio-chemical variables of plant leaves and canopies.
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Yoshio Inoue, Yoshio Inoue, Josep Penueleus, Josep Penueleus, Yann Nouevllon, Yann Nouevllon, M. Susan Moran, M. Susan Moran, } "Hyperspectral reflectance measurements for estimating eco-physiological status of plants", Proc. SPIE 4151, Hyperspectral Remote Sensing of the Land and Atmosphere, (8 February 2001); doi: 10.1117/12.417003; https://doi.org/10.1117/12.417003
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