Modeling directional forest reflectance with the hybrid type forest reflectance model FRT

The directional multispectral hybrid type forest radiative transfer model FRT by Kuusk and Nilson (2000) was compared using directional reflectance factor of high angular resolution measured over three mature hemiboreal forest stands in Estonia. The model systematically underestimated backward scatt...

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Bibliographic Details
Published in:Remote sensing of environment 2014-06, Vol.149, p.196-204
Main Authors: Kuusk, Andres, Kuusk, Joel, Lang, Mait
Format: Article
Language:English
Subjects:
Airborne measurements
Animal, plant and microbial ecology
Applied geophysics
Asymmetry
Biological and medical sciences
Earth sciences
Earth, ocean, space
Exact sciences and technology
Forest BRF
Forests
Fundamental and applied biological sciences. Psychology
General aspects. Techniques
Internal geophysics
Mathematical models
Model validation
Reflectance
Reflectivity
Scattering
Stands
Supports
Teledetection and vegetation maps
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Summary:The directional multispectral hybrid type forest radiative transfer model FRT by Kuusk and Nilson (2000) was compared using directional reflectance factor of high angular resolution measured over three mature hemiboreal forest stands in Estonia. The model systematically underestimated backward scattering even in the case of the best available input data, especially in coniferous stands. The measured BRF distribution could be reproduced if the spherical leaf angle distribution was replaced by erectophile in order to better model the angular dependence of gap fraction, and the Ross–Nilson area scattering phase function was replaced by significantly more asymmetric Henyey–Greenstein phase function. The limited amount of available data does not allow deciding how universal are the applied asymmetry parameter values. The asymmetry of the phase function may depend on the species composition, stand age, and site type. •Directional forest reflectance model FRT is compared against airborne BRF data.•Substantial modifications of the model FRT are introduced.•The modified model FRT reproduces the actual angular distribution of forest BRF.
ISSN:0034-4257
1879-0704
DOI:10.1016/j.rse.2014.03.035