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, Craig Daughtry, Robert Dahlgren, "Remotely sensing the photochemical reflectance index, PRI," Proc. SPIE 9613, Polarization Science and Remote Sensing VII, 96130Z (1 September 2015);