Incorporation of azimuthal dependence into the LCM2 coupled leaf/canopy reflectance model

Barry Ganapol; Richard H. Picard; Jeremy R. Winick; Peter P. Wintersteiner; Stanley Woolf

doi:10.1117/12.454197

28 January 2002 Incorporation of azimuthal dependence into the LCM2 coupled leaf/canopy reflectance model

Barry Ganapol, Richard H. Picard, Jeremy R. Winick, Peter P. Wintersteiner, Stanley Woolf

Proceedings Volume 4542, Remote Sensing for Agriculture, Ecosystems, and Hydrology III; (2002) https://doi.org/10.1117/12.454197
Event: International Symposium on Remote Sensing, 2001, Toulouse, France

Abstract

A coupled leaf/canopy radiative transfer model, LCM2, has been developed with NASA and AFRL funding to investigate the feasibility of detecting spectral signatures from within and under a vegetation canopy. The model is unique in that it features direct radiative transfer coupling between the leaf scattering elements and the canopy reflectance, through the within-leaf radiative transfer model, LEAFMOD. The leaf radiative transfer model characterizes photon scattering within a participating homogeneous leaf taking into account both biochemical composition and leaf thickness. The leaf model is incorporated as the scattering element in a canopy reflectance model (CANMOD) assuming a bi-Lambertian leaf scattering phase function. The primary distinction between conventional and canopy radiative transfer is canopy architecture, which is introduced through leaf angle distributions. A Lambertian partially reflecting background is assumed to lie beneath the canopy. The influences of biochemical composition, average leaf thickness, reflecting background, and canopy architecture on canopy reflectance can therefore be investigated. The model is extended here to include azimuthal dependence by considering collided and first collided radiances separately. The LCM2 model with the new azimuthal correction will be coupled to an atmospheric radiative transfer code, MODTRAN4, to simulate a satellite imager response at orbital altitude.

Citation Download Citation

Barry Ganapol, Richard H. Picard, Jeremy R. Winick, Peter P. Wintersteiner, and Stanley Woolf "Incorporation of azimuthal dependence into the LCM2 coupled leaf/canopy reflectance model", Proc. SPIE 4542, Remote Sensing for Agriculture, Ecosystems, and Hydrology III, (28 January 2002); https://doi.org/10.1117/12.454197

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