| 光谱学与光谱分析 |
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| Influence of Measurement Errors of Radiation in NIR Bands on Water Atmospheric Correction |
| XU Hua1, 2, LI Zheng-qiang1, 2, YIN Qiu3, GU Xing-fa1, 2* |
1. State Environmental Protection Key Lab of Satellite Remote Sensing, Ministry of Environmental Protection, Beijing 100101, China
2. State Key Laboratory of Remote Sensing Sciences, Institute of Remote Sensing Application, Chinese Academy of Sciences, Beijing 100101, China
3. Shanghai Center of Satellite Remote Sensing Applications, Shanghai 200083, China |
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Abstract For standard algorithm of atmospheric correction of water, the ratio of two near-infrared (NIR) channels is selected to determine an aerosol model, and then aerosol radiation at every wavelength is accordingly estimated by extrapolation. The uncertainty of radiation measurement in NIR bands will play important part in the accuracy of water-leaving reflectance. In the present research, erroneous expressions were derived mathematically in order to see the error propagation from NIR bands. The errors distribution of water-leaving reflectance was thoroughly studied. The results show that the bigger the errors of measurement are made, the bigger the errors of water-leaving reflectance are retrieved, with sometimes the NIR band errors canceling out. Moreover, the higher the values of aerosol optical depth or the more the component of small particles in aerosol, the bigger the errors that appear during retrieval.
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Received: 2012-11-09
Accepted: 2013-02-24
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Corresponding Authors:
GU Xing-fa
E-mail: xfgu@irsa.ac.cn
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