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Remote Sens. 2015, 7(11), 15536-15560; doi:10.3390/rs71115536

Estimating Crop Albedo in the Application of a Physical Model Based on the Law of Energy Conservation and Spectral Invariants

1,2
,
1,3,* , 1,3,†
,
4,†
,
2,5,* , 1,3
and
1,3
1
Institute of RS and GIS, Peking University, Beijing 100871, China
2
State Key Laboratory of Remote Sensing Science, jointly sponsored by Institute of Remote Sensing and Digital Earth of CAS and Beijing Normal University, Beijing 100101, China
3
The Beijing Key Laboratory of Spatial Information Integration and 3S Application, Beijing 100871, China
4
Beijing Research Institute of Automation for Machinery Industry, Beijing 100120, China
5
Joint Center for Global Change Studies, Beijing 100875, China
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Academic Editors: Xin Li, Yuei-An Liou, Richard Müller and Prasad S. Thenkabail
Received: 4 August 2015 / Accepted: 10 November 2015 / Published: 18 November 2015

Abstract

Albedo characterizes the radiometric interface of land surfaces, especially vegetation, and the atmosphere. Albedo is a critical input to many models, such as crop growth models, hydrological models and climate models. For the extensive attention to crop monitoring, a physical albedo model for crops is developed based on the law of energy conservation and spectral invariants, which is derived from a prior forest albedo model. The model inputs have been efficiently and physically parameterized, including the dependency of albedo on the solar zenith/azimuth angle, the fraction of diffuse skylight in the incident radiance, the canopy structure, the leaf reflectance/transmittance and the soil reflectance characteristics. Both the anisotropy of soil reflectance and the clumping effect of crop leaves at the canopy scale are considered, which contribute to the improvement of the model accuracy. The comparison between the model results and Monte Carlo simulation results indicates that the canopy albedo has high accuracy with an RMSE < 0.005. The validation using ground measurements has also demonstrated the reliability of the model and that it can reflect the interaction mechanism between radiation and the canopy-soil system. View Full-Text
Keywords: albedo; crop; spectral invariant albedo; crop; spectral invariant
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Peng, J.; Fan, W.; Xu, X.; Wang, L.; Liu, Q.; Li, J.; Zhao, P. Estimating Crop Albedo in the Application of a Physical Model Based on the Law of Energy Conservation and Spectral Invariants. Remote Sens. 2015, 7, 15536-15560.

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