| 渤海近岸水体漫衰减系数Kd(490)遥感反演模型 |
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| 引用本文： | 崔廷伟,张杰,马毅,孙凌,赵文静.渤海近岸水体漫衰减系数Kd(490)遥感反演模型[J].遥感学报,2009,13(3):417-429. |
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| 作者姓名： | 崔廷伟 张杰 马毅 孙凌 赵文静 |
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| 作者单位： | 1. 国家海洋局 第一海洋研究所, 山东 青岛 266061;1. 国家海洋局 第一海洋研究所, 山东 青岛 266061 ; 2. 海洋环境和数值模拟国家海洋局重点实验室, 山东 青岛 266061;1. 国家海洋局 第一海洋研究所, 山东 青岛 266061 ; 2. 海洋环境和数值模拟国家海洋局重点实验室, 山东 青岛 266061;3. 中国气象局 中国遥感卫星辐射测量和定标重点开放实验室, 北京 100081 ; 4. 中国气象局 国家卫星气象中心, 北京 100081;1. 国家海洋局 第一海洋研究所, 山东 青岛 266061 |
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| 基金项目： | 基金项目: 国家自然科学基金(编号：40706060, 40606043), 国家高技术研究发展计划项目(编号：2006AA09A310), Dragon Project (编号: ID 5292), 海洋公益性行业科研专项经费项目(编号：200705027), 我国近海海洋综合调查与评价专项(编号：908-01-ST11), 国家海洋局青年科学基金(编号：2008401)和国家海洋局第一海洋研究所基本科研业务费专项资金项目(编号：2007B05)。 |
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| 摘 要： | Irrigated land is one of the most important parts in land cover classification system, but until now it has seldom been reported about extracting it from remote sensing data and monitoring its dynamic change. The existing researches are focused on the land use-cover change (LUCC) and the irrigated area mapping, so the study on extracting irrigated land is much more important. On the basis of close relationship between water deficit index (WDI) and soil water content, this paper firstly combines two neighbor NDVI and the surface-air temperature (Ts-Ta) and conforms one Vegetation Index Temperature (VIT). It makes the timely incomparable WDI comparable and then computes the change of WDI during the monitored period. Secondly it infers the change of soil water. Thirdly it removes the rainfall’s influence under some assumption and extracts the irrigated land of the survey area. Results show that comparing with census data all the deviation is below 7% in the survey area except Shanxi province, which means that the extracted results are comparable with census data. Extracted irrigated land mainly distributes around rivers, lakes, and reservoirs or on the irrigated regions and oasises. The results are consistent with the centralized region which has abundant irrigated land known before. The results are checked elementarily using TM images. All the precisions are above 70% except in Shanxi province. The precision in Xinjiang municipality is the highest.
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| 关 键 词： | 渤海 漫衰减系数Kd(490) 遥感反射率 反演模型 |
| 收稿时间： | 5/5/2008 12:00:00 AM |
| 修稿时间： | 2008/7/23 0:00:00 |
Diffuse attenuation coefficient Kd(490)retrieval model for nearshore area of Bohai sea |
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| CUI Ting-wei,ZHANG Jie,MA Yi,SUN Ling and ZHAO Wen-jing.Diffuse attenuation coefficient Kd(490)retrieval model for nearshore area of Bohai sea[J].Journal of Remote Sensing,2009,13(3):417-429. |
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| Authors: | CUI Ting-wei ZHANG Jie MA Yi SUN Ling and ZHAO Wen-jing |
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| Affiliation: | 1. Institute of Remote Sensing Applications, Chinese Academy of Sciences, Beijing 100101, China; 2. Key Laboratory of Resources Remote Sensing & Digital Agriculture Ministry of Agriculture, Beijing 100081, China; 3. Graduate University of Chinese Academy;1. Institute of Remote Sensing Applications, Chinese Academy of Sciences, Beijing 100101, China; 2. Key Laboratory of Resources Remote Sensing & Digital Agriculture Ministry of Agriculture, Beijing 100081, China; 3. Graduate University of Chinese Academy;1. Institute of Remote Sensing Applications, Chinese Academy of Sciences, Beijing 100101, China |
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| Abstract: | In this paper, a method to evaluate the in-flight MTF (Modulate Transfer Function) of the WFI (Wide Field Imager) on CBERS-02B is presented and the WFI images are restored. The CCD is another payload on CBERS-02B with high spatial resolution. Using the CCD images as high resolution images, the two-image comparison approach is applied to determine the MTF of the WFI with a pair of images acquired over Beijing on Nov. 10, 2007. As the results, MTF values in three directions are derived. The MTF values at Nyquist frequency in cross-track, in-track and 45° directions were respectively about 0.43, 0.52 and 0.35 for red band and 0.30, 0.46 and 0.36 for near-infrared band. Image-derived MTF values are applied to calculate the half bandwidths of the WFI. The results indicate that the instant fields of view of the WFI in the cross-track, in-track and 45o-track directions were respectively 1.188 pixels, 1.165 pixels and 1.281 pixels for red band, and respectively 1.258 pixels, 1.195 pixels and 1.326 pixels for near-infrared band. Weiner filter model is used to perform the MTF compensation for WFI images. The results show that the restored image seemed clearer and contained more detailed information. |
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| Keywords: | Irrigated land is one of the most important parts in land cover classification system but until now it has seldom been reported about extracting it from remote sensing data and monitoring its dynamic change The existing researches are focused on the lan |
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