| 光谱学与光谱分析 |
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| Estimation of Forest Canopy Chlorophyll Content Based on PROSPECT and SAIL Models |
| YANG Xi-guang, FAN Wen-yi*, YU Ying |
| Northeast Forestry University, Harbin 150040, China |
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Abstract The forest canopy chlorophyll content directly reflects the health and stress of forest. The accurate estimation of the forest canopy chlorophyll content is a significant foundation for researching forest ecosystem cycle models. In the present paper, the inversion of the forest canopy chlorophyll content was based on PROSPECT and SAIL models from the physical mechanism angle. First, leaf spectrum and canopy spectrum were simulated by PROSPECT and SAIL models respectively. And leaf chlorophyll content look-up-table was established for leaf chlorophyll content retrieval. Then leaf chlorophyll content was converted into canopy chlorophyll content by Leaf Area Index (LAI). Finally, canopy chlorophyll content was estimated from Hyperion image. The results indicated that the main effect bands of chlorophyll content were 400-900 nm, the simulation of leaf and canopy spectrum by PROSPECT and SAIL models fit better with the measured spectrum with 7.06% and 16.49% relative error respectively, the RMSE of LAI inversion was 0.542 6 and the forest canopy chlorophyll content was estimated better by PROSPECT and SAIL models with precision=77.02%.
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Received: 2009-12-12
Accepted: 2010-03-16
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Corresponding Authors:
FAN Wen-yi
E-mail: fanwy@163.com
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