1 September 2015 Remotely sensing the photochemical reflectance index, PRI
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Abstract
In remote sensing, the Photochemical Reflectance Index (PRI) provides insight into physiological processes occurring inside leaves in a plant stand. Developed by1,2, PRI evolved from laboratory reflectance measurements of individual leaves. Yet in a remotely sensed image, a pixel measurement may include light from both reflecting and transmitting leaves.

We compared values of PRI based upon polarized reflectance and transmittance measurements of water and nutrient stressed leaves. Our results show the polarized leaf surface reflection should be removed when calculating PRI and that the leaf physiology information is in leaf interior reflectance, not leaf transmittance.
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Vern Vanderbilt, Vern Vanderbilt, Craig Daughtry, Craig Daughtry, Robert Dahlgren, Robert Dahlgren, } "Remotely sensing the photochemical reflectance index, PRI", Proc. SPIE 9613, Polarization Science and Remote Sensing VII, 96130Z (1 September 2015); doi: 10.1117/12.2187160; https://doi.org/10.1117/12.2187160
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