| Technology and Methodology |
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Simulation analysis of vegetation TOA reflectance based on coupled leaf-canopy-atmosphere radiative transfer model |
| DIAN Yuanyong1,2, FANG Shenghui2 |
1. College of Horticulture and Forestry, Huazhong Agricultural University, Wuhan 430079, China;
2. School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430070, China |
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Abstract Coupled plant leaf spectral model PROSPECT, vegetation canopy spectral model SAIL(scattering by arbitrarily inclined leaves) and atmospheric radiative transfer model 6S(second simulation of the satellite signal in the solar spectrum)were used to simulate the top of atmospheric(TOA) reflectance of vegetation under different conditions. And then the influences on the spectrum of the leaf mesophyll structure parameters, chlorophyll content, leaf dry weight, leaf water content, plant canopy of LAI, solar zenith angle, aerosol optical thickness (AOT), adjacency effect and mix-pixel effect were analyzed. The research results show that the vegetation TOA reflectance error caused by the atmosphere is by far larger than the error caused by the biochemical parameters of plant itself. At the leaf level scale, the main factors causing reflectance change are chlorophyll content and mesophyll structure parameters, the effect of water content is very small on leaf reflectance in 400~900 nm. At the canopy level, the main factors causing spectral change are LAI and leaf angle distribution.
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| Keywords
surface environment
dynamic change
remote sensing
monitoring
interpretation keys
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Issue Date: 03 July 2013
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2013,
Vol. 25
