| 表观反射率及其在植被遥感中的应用 |
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| 引用本文： | 池宏康,周广胜,许振柱,肖春旺,袁文平.表观反射率及其在植被遥感中的应用[J].植物生态学报,2005,29(1):74-80. |
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| 作者姓名： | 池宏康 周广胜 许振柱 肖春旺 袁文平 |
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| 作者单位： | (中国科学院植物研究所植被数量生态学重点实验室，北京100093) |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家自然科学基金 |
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| 摘 要： | 由于植被遥感应用定量化和监测等的需求，光学遥感数据的辐射校正更加受到重视。该文论述了辐射校正，辐射定标和大气校正的概念以及它们之间的区别及关系。特别对辐射定标的结果之一，大气层顶表观反射率，简称表观反射率(Apparent reflectance)的定义、概念、计算和它在植被遥感中的应用等方面，进行了详细的论述。
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| 关 键 词： | 表观反射率 辐射校正 辐射定标 大气校正 植被遥感 |
| 修稿时间： | 2003年11月19 |
APPARENT REFLECTANCE AND ITS APPLICATIONS IN VEGETATION REMOTE SENSING |
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| CHI Hong-Kang ZHOU Guang-Sheng XU Zhen-Zhu XIAO Chun-Wang and YUAN Wen-Ping.APPARENT REFLECTANCE AND ITS APPLICATIONS IN VEGETATION REMOTE SENSING[J].Acta Phytoecologica Sinica,2005,29(1):74-80. |
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| Authors: | CHI Hong-Kang ZHOU Guang-Sheng XU Zhen-Zhu XIAO Chun-Wang and YUAN Wen-Ping |
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| Affiliation: | (Laboratory of Quantitative Vegetation Ecology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China) |
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| Abstract: | Remote sensing of vegetation is developing into a highly quantitative science. However, some concepts and terms related to quantitative remote sensing are confusing for novices of this field. The goal of this paper is to clarify fuzzy concepts and promiscuous terms and to introduce methods about data processing of remote sensing information. First, concepts about radiometric correction, radiometric calibration, atmospheric correction and the differences and relationships between them were discussed. In optical remote sensing, radio-metric correction includes radiometric calibration and atmospheric correction. The aim of radiometric calibration is to eliminate the errors in the sensors of the satellite, and the aim of atmospheric correction is to eliminate the effects of atmospheric interference on satellite data. In general, the first step is radiometric calibration and then atmospheric correction. Apparent reflectance is one of the results of radiometric calibration and is a very important physical variable in processing remote sensing data. The definition of apparent reflectance can be indicated with a formula. The calculation of apparent reflectance was explained step-by-step using examples with Land-sat-5 and Landsat-7 satellite images. A case study was presented in order to show the importance of apparent reflectance in the calculation of NDVI (Normalized difference vegetation index) . Finally, its applications in vegetation remote sensing were listed and discussed. |
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| Keywords: | Apparent reflectance Radiometric correction Radiometric calibration Atmospheric correction Vegetation remote sensing |
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