Spectral Similarity and PRI Variations for a Boreal Forest Stand Using Multi-angular Airborne Imagery
AbstractThe photochemical reflectance index (PRI) is a proxy for light use efficiency (LUE), and is used in remote sensing to measure plant stress and photosynthetic downregulation in plant canopies. It is known to depend on local light conditions within a canopy indicating non-photosynthetic quenching of incident radiation. Additionally, when measured from a distance, canopy PRI depends on shadow fraction—the fraction of shaded foliage in the instantaneous field of view of the sensor—due to observation geometry. Our aim is to quantify the extent to which sunlit fraction alone can describe variations in PRI so that it would be possible to correct for its variation and identify other possible factors affecting the PRI–sunlit fraction relationship. We used a high spatial and spectral resolution Aisa Eagle airborne imaging spectrometer above a boreal Scots pine site in Finland (Hyytiälä forest research station, 61°50′N, 24°17′E), with the sensor looking in nadir and tilted (off-nadir) directions. The spectral resolution of the data was 4.6 nm, and the spatial resolution was 0.6 m. We compared the PRI for three different scatter angles (
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Markiet, V.; Hernández-Clemente, R.; Mõttus, M. Spectral Similarity and PRI Variations for a Boreal Forest Stand Using Multi-angular Airborne Imagery. Remote Sens. 2017, 9, 1005.
Markiet V, Hernández-Clemente R, Mõttus M. Spectral Similarity and PRI Variations for a Boreal Forest Stand Using Multi-angular Airborne Imagery. Remote Sensing. 2017; 9(10):1005.Chicago/Turabian Style
Markiet, Vincent; Hernández-Clemente, Rocío; Mõttus, Matti. 2017. "Spectral Similarity and PRI Variations for a Boreal Forest Stand Using Multi-angular Airborne Imagery." Remote Sens. 9, no. 10: 1005.
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