Polarization to estimate leaf surface reflectance

The Photochemical Reflectance Index (PRI) provides insight remote sensing into plant physiological processes occurring at leaf to canopy scales. We have found that PRI displays greater sensitivity to these processes if redefined to exclude the leaf surface reflectance. Here we suggest our published method for estimating leaf surface reflectance using linear polarizers underestimates the actual leaf surface reflectance. We suggest part of the leaf volume reflectance obtained using our published method represents light diffusely scattered by the leaf surface. We propose here a modification to our published method in order to obtain estimates of vPRI that are presumably more sensitive to leaf photochemistry.

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