摘要
雷达成像原理和回波信号处理的特殊性,使得斑点噪声是雷达数据所固有的。斑点噪声滤除是雷达数据分析、处理不可或缺的工作。针对ERS-2 PRI产品,分别基于传统方法、模型方法、局域统计自适应滤波法和几何滤波法进行滤噪处理及其去噪质量评价,发现几何滤波的Gamma MAP消除雷达噪声效果最佳,并基于去噪后的多时相数据进行土地利用/覆盖分类。
SAR speckle are inherent as a result of particularity of SAR imaging principles and its signal process complexity. Thus, despeckle of SAR is the first step for further processing and applying. In this paper, several different typical despeclde fil- ters, such as mean filter,median filter,Lee filter,Kuan filter and Gamma MAP filter, were applied to the ERS-2 PRI SAR image. According to results of quantitative evaluation for the despeckle images,Gamma MAP is taken for the best filter. Basing on five multi-temperal despeckle ERS-2 images, land use/cover classification was applied in the study of a case using the Gamma MAP method .
出处
《地理与地理信息科学》
CSCD
北大核心
2008年第1期43-45,84,共4页
Geography and Geo-Information Science
