Modeling the radiation transfer of discontinuous canopies: results for gap probability and single-scattering contribution

Feng Zhao; Kai Zou; Hong Shang; Zheng Ji; Huijie Zhao; Wenjiang Huang; Cunjun Li

doi:10.1117/12.868464

22 October 2010 Modeling the radiation transfer of discontinuous canopies: results for gap probability and single-scattering contribution

Feng Zhao, Kai Zou, Hong Shang, Zheng Ji, Huijie Zhao, Wenjiang Huang, Cunjun Li

Author Affiliations +

Proceedings Volume 7824, Remote Sensing for Agriculture, Ecosystems, and Hydrology XII; 78241L (2010) https://doi.org/10.1117/12.868464
Event: SPIE Remote Sensing, 2010, Toulouse, France

Abstract

In this paper we present an analytical model for the computation of radiation transfer of discontinuous vegetation canopies. Some initial results of gap probability and bidirectional gap probability of discontinuous vegetation canopies, which are important parameters determining the radiative environment of the canopies, are given and compared with a 3- D computer simulation model. In the model, negative exponential attenuation of light within individual plant canopies is assumed. Then the computation of gap probability is resolved by determining the entry points and exiting points of the ray with the individual plants via their equations in space. For the bidirectional gap probability, which determines the single-scattering contribution of the canopy, a gap statistical analysis based model was adopted to correct the dependence of gap probabilities for both solar and viewing directions. The model incorporates the structural characteristics, such as plant sizes, leaf size, row spacing, foliage density, planting density, leaf inclination distribution. Available experimental data are inadequate for a complete validation of the model. So it was evaluated with a three dimensional computer simulation model for 3D vegetative scenes, which shows good agreement between these two models' results. This model should be useful to the quantification of light interception and the modeling of bidirectional reflectance distributions of discontinuous canopies.

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Feng Zhao, Kai Zou, Hong Shang, Zheng Ji, Huijie Zhao, Wenjiang Huang, and Cunjun Li "Modeling the radiation transfer of discontinuous canopies: results for gap probability and single-scattering contribution", Proc. SPIE 7824, Remote Sensing for Agriculture, Ecosystems, and Hydrology XII, 78241L (22 October 2010); https://doi.org/10.1117/12.868464

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KEYWORDS

3D modeling

Solar radiation models

Statistical modeling

Data modeling

Computer simulations

Scattering

Vegetation

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