| Mao Kebiao (毛克彪),Ma Ying,Shen Xinyi,Sun Zhiwen.[J].高技术通讯(英文),2014,20(1):88~91 |
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| The study of estimation method of broadband emissivity from EOS/MODIS data |
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| DOI：10.3772/j.issn.1006-6748.2014.01.014 |
| 中文关键词: |
| 英文关键词: moderate-resolution imaging spectroradiometer (MODIS), broadband emissivity, land surface temperature |
| 基金项目: |
| Author Name | Affiliation | | Mao Kebiao (毛克彪) | | | Ma Ying | | | Shen Xinyi | | | Sun Zhiwen | |
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| 中文摘要: |
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| 英文摘要: |
| The broadband emissivity is an important parameter for estimating the energy balance of the Earth. This study focuses on estimating the window (8-12 μm) emissivity from the MODIS (moderate-resolution imaging spectroradiometer) data, and two methods are built. The regression method obtains the broadband emissivity from MOD11B15KM product, whose coefficient is developed by using 128 spectra, and the standard deviation of error is about 0.0118 and the mean error is about 0.0084. Although the estimation accuracy is very high while the broadband emissivity is estimated from the emissivity of bands 29, 31 and 32 obtained from MOD11B15KM product, the standard deviations of errors of single emissivity in bands 29, 31, 32 are about 0.009 for MOD11B15KM product, so the total error is about 0.02 and resolution is about 5km×5km. A combined radiative transfer model with dynamic learning neural network method is used to estimate the broadband emissivity from MODIS 1B data. The standard deviation of error is about 0.016, the mean error is about 0.01, and the resolution is about 1km×1km. The validation and application analysis indicates that the regression is simpler and more practical, and estimation accuracy of the dynamic learning neural network method is higher. Considering the needs for accuracy and practicalities in application, one of them can be chosen to estimate the broadband emissivity from MODIS data. |
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