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Proceedings Paper

A method for estimating the incident PAR on inclined surfaces
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Paper Abstract

A new simple model has been developed that incorporates Digital Elevation Model (DEM) and Moderate Resolution Imaging Spectroradiometer (MODIS) products to produce incident photosynthetically active radiation (PAR) for tilted surface. The method is based on a simplification of the general radiative transfer equation, which considers five major processes of attenuation of solar radiation: 1) Rayleigh scattering, 2) absorption by ozone and water vapor, 3) aerosol scattering, 4) multiple reflectance between surface and atmosphere, and 5) three terrain factors: slope and aspect, isotropic sky view factor, and additional radiation by neighbor reflectance. A comparison of the model results with observational data from the Yucheng and Changbai Mountain sites of the Chinese Ecosystem Research Network (CERN) shows the correlation coefficient as 0.929 and 0.904, respectively. A comparison of the model results with the 2006 filed measured PAR in the Yucheng and Changbai sites shows the correlation coefficient as 0.929 and 0.904, respectively, and the average percent error as 10% and 15%, respectively.

Paper Details

Date Published: 10 September 2008
PDF: 7 pages
Proc. SPIE 7083, Remote Sensing and Modeling of Ecosystems for Sustainability V, 70830P (10 September 2008); doi: 10.1117/12.791695
Show Author Affiliations
Xiaoping Xie, Nanjing Univ. of Information Science & Technology (China)
Institute of Geographical Sciences and Natural Resources Research (China)
Wei Gao, Colorado State Univ. (United States)
Zhiqiang Gao, Institute of Geographical Sciences and Natural Resources Research (China)
Colorado State Univ. (United States)


Published in SPIE Proceedings Vol. 7083:
Remote Sensing and Modeling of Ecosystems for Sustainability V
Wei Gao; Hao Wang, Editor(s)

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