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Improved model inversion procedure for plant water status assessment under artificial lighting using PROSPECT+SAIL model

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  033118,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.15323)
Authors:   Yang Yang, P. P. Ling
Keywords:   Robustness, plant monitoring, remote sensing, controlled environment agriculture, numerical method, modeling

Precision water management is desirable for value-added plant production in controlled environment. A procedure was developed to assess plant water status using a model based hyperspectral approach. PROSPECT+SAIL model was used to determine equivalent water thickness (EWT) from measured plant canopy reflectance (400-2,500 nm) under artificial light sources. The major effort of this research was to improve the reliability of approximating best solutions of the non-linear model. To avoid local minima, boundaries of dependable variables were defined, dimensionality of correlated dependent variable was reduced. The model performance was found disappointing in the spectral range between 400-1,300 nm because of the spectral characteristics of the artificial light sources. The assessment of water status using spectral band 1,300 2,500 nm, however, was found promising. A reliable methodology was developed for accurate determination of water status of New Guinea Impatiens in a growth chamber.

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