| 洪涝灾情快速反应的星载SAR与TM数据的融合处理 |
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| 引用本文： | 陈桂红,唐伶俐,戴昌达,姜小光.洪涝灾情快速反应的星载SAR与TM数据的融合处理[J].地球信息科学,2003,5(1):103-108,2. |
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| 作者姓名： | 陈桂红 唐伶俐 戴昌达 姜小光 |
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| 作者单位： | 中国科学院中国遥感卫星地面站, 北京 100086 |
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| 摘 要： | 本文以1998年鄱阳湖地区发生洪涝灾害为研究实例,应用灾中的Radarsat-SAR和灾前的TM数据,以不规则三角网(TIN)方法实现了高精度几何配准。然后,通过波段相关性和信息熵值分析,选取最佳波段。最后,对不同融合模型得出的图像进行对比,得出结论:以灾中的SAR和灾前TM的一个近红外(TM5或TM7)以及一个可见光波段(TM3最佳),分别赋RGB色合成的图像效果很好,既能识别区分洪涝淹没的绝产区、土壤滞水减产区和未受灾区,并且操作简便,能满足洪涝灾情快速反应要求。
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| 关 键 词： | 图像融合 IHS变换 TIN配准 假彩色合成 熵 |
| 收稿时间： | 2002-12-06; |
On Quick Response to Flood with Fusion of SAR and TM Data |
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| CHEN GuihongTANG LingliDAI ChangdaJIANG Xiaoguang.On Quick Response to Flood with Fusion of SAR and TM Data[J].Geo-information Science,2003,5(1):103-108,2. |
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| Authors: | CHEN GuihongTANG LingliDAI ChangdaJIANG Xiaoguang |
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| Institution: | China Remote Sensing Satellite Ground Station, CAS, Beijing 100086 |
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| Abstract: | This paper takes Poyang Lake where the famous 98's catastrophic flood happened in 1998 as an example. With available data of a during-flood SAR image and one pre-flood TM image, an approach named TIN (Triangulated Irregular Network) was used for registration, with better accuracy than other general methods. Then according to statistic analysis including interband correlation and entropy, etc. the selection of the optimal bands of TM was discussed. Finally, in order to monitor flood better and more quickly, various fusion approaches were applied and compared based on time-consuming operations. As a result, the pseudocolor composition of SAR, one near infrared TM band (TM5 or TM7) and one visible TM band (TM3 is optimal) is the best, which not only can make us easily identify flood extend area, soil area full of water content and non-flood area from each other, but also is simple and less time-consuming. It will meet the need of rapid response to flood. |
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| Keywords: | Image fusion technology HIS transform TIN registration Pseudocolor composition Entropy |
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