M. Methy et al., Remote sensing of canopy photosynthetic performances: Two complementary ways for assessing the photochemical reflectance index, PHOTOSYNTHE, 37(2), 1999, pp. 239-247
Two methods have been developed concurrently for hyperspectral measurements
of plant canopy reflectance in two narrow wavelength bands centred around
531 and 570 nm. A laboratory-built two-channel radiometer provided an easy
and quick estimation of the Photochemical Reflectance Index PRI = (R-531 -
R-570)/(R-570 + R-531) of a plot of alfalfa, A CCD digital camera provided
multispectral imaging and the analysis of this index on the same target. Th
e two devices are complementary. The results of measurements are complement
ary with those of chlorophyll fluorescence induction.