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| 一种基于极化距离测度的SAR变化检测方法 | |
| 引用本文： | 张永红,张现峰,付姣,金姗姗. 一种基于极化距离测度的SAR变化检测方法[J]. 测绘学报, 2014, 43(2): 143 |
| 作者姓名： | 张永红 张现峰 付姣 金姗姗 |
| 作者单位： | 1. 中国测绘科学研究院;2. 山东正元地理信息工程有限责任公司潍坊分公司;3. 中国测绘科学研究院，辽宁工程技术大学 |
| 基金项目： | 国家自然科学基金(40971225;41271430);国家973计划(2012CB719905);国家863计划(2011AA120404) |
| 摘 要： | 本文在经典的极化分类Wishart距离基础上提出了一种对变化敏感的极化距离测度，发展了相应的多时相极化SAR变化检测方法。以北京地区的多时相全极化RADARSAT-2影像进行了实验，对比分析了提出的极化距离测度与各个极化通道后向散射系数对数比值对不同类型地物变化的区分能力，结果表明，提出的极化距离测度不仅对所有的变化类型均有良好的检测作用，而且对变化区域有更高的区分力。这说明本文提出的极化SAR变化检测方法具有广泛的应用价值。 |
| 关 键 词： | 极化合成孔径雷达 变化检测 极化相干矩阵 距离测度 |
| 收稿时间： | 2013-01-15 |
| 修稿时间： | 2013-12-06 |
A SAR change detection method based on polarimetric distance measure |
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| Abstract: | A new distance measure derived from the polarimetric coherency matrix was proposed on the basis of classical Wishart distance originally developed for polarimetric SAR image classification. A change detection methodology based on the proposed polarimetric distance measure was then developed. An experiment of change detection using two RADARSAT-2 quad-polarized images acquired in 2009 and 2010 respectively over a suburb area of Beijing was carried out. The change detection capability of the polarimetric distance measure was compared to the log-ratio images formed by the radar intensities of different polarization channels and the total scattered power (the Span). The results showed that the polarimetric distance measure could highlight all types of land cover changes, while only part of change types were visible on intensity-related log-ration images. Moreover, the difference image generated from the polarimetric distance presented highest separability between changed and unchanged pixels. Therefore, the proposed change detection method could be widely applicable for change detection from polarized SAR images. |
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