National Sea Area Use Dynamic Monitoring Based on GF-3 SAR Imagery
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摘要: 高分三号作为我国首颗民用C波段多极化多成像模式SAR卫星,其全天时全天候观测特点,在国家海域使用动态监测中具有较大优势。该文在分析国家海域使用遥感监测的基础上,探讨GF-3号 SAR成像模式和标准预处理方式,并以海岸线围填海、海水养殖等典型海域使用要素为例,给出GF-3不同成像模式在海域使用要素识别分类的部分研究结果,并与现有方法进行对比分析,最后展望了进一步研究方向。Abstract: GaoFen-3 (GF-3) is the first commercial C-Band multi-polarimetric Synthetic Aperture Radar (SAR) satellite that was launched by China. The characteristics observed by both all-day and all-weather observation depict significant advantages of national sea area use dynamic monitoring. We have thoroughly discussed both the imaging mode and the standard preprocessing of GF-3 imagery by analyzing national sea area use dynamic monitoring. We have portrayed reclamation and aquaculture as significant examples of dynamic monitoring. We have presented both identification and classification results using various image modes of GF-3 satellite, compared with the existing approaches. Finally, we have elaborated on the scope for future research.
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图 9 浮筏养殖的极化散射机制示意图(①海水表面散射,②浮球表面散射,③海水浮球二面角散射,④海水浮球螺旋体散射,⑤水下表面散射,⑥水下体散射)
Figure 9. Schematic diagram of floating raft aquaculture scattering mechanism (① Scattering method of sea surface, ② Scattering method of floating raft, ③ Scattering method of dihedral caused by raft and sea surface, ④ Scattering method of helix structure, ⑤ Scattering method of surface under water, ⑥ Scattering method of body under water)
表 1 GF-3卫星SAR数据属性信息
Table 1. Attribute information of SAR data on GF-3
序号 成像模式 分辨率(m) 成像幅宽(km) 入射角范围(°) 极化方式 标称 方位向 距离向 标称 范围 1 聚束 1 1.0~1.5 0.9~2.5 10×10 10×10 20~50 可选单极化 2 超精细条带 3 3 2.5~5.0 30 30 20~50 可选单极化 3 精细条带Ⅰ 5 5 4~6 50 50 19~50 可选双极化 4 精细条带Ⅱ 10 10 8~12 100 95~110 19~50 可选双极化 5 标准条带 25 25 15~30 130 95~150 17~50 可选双极化 6 窄幅扫描Ⅰ 50 50~60 30~60 300 300 17~50 可选双极化 7 窄幅扫描Ⅱ 100 100 50~110 500 500 17~50 可选双极化 8 全极化条带Ⅰ 8 8 6~9 30 20~35 20~41 全极化 9 全极化条带Ⅱ 25 25 15~30 40 35~50 20~38 全极化 10 波成像模式 10 10 8~12 5×5 5×5 20~41 全极化 11 全球观测成像模式 500 500 350~700 650 650 17~53 可选双极化 12 扩展入射角 低入射角 25 25 15~30 130 120~150 10~20 可选双极化 高入射角 25 25 20~30 80 70~90 50~60 可选双极化 表 2 精度评价结果
Table 2. The results of precision assessment
区域 RMSE波动范围(像素数) 位置相同像素点 位置不同像素点 准确率 大连金州湾 0.5~1.5 46 4 92% 表 3 精度评价结果
Table 3. The results of precision assessment
区域 单极化聚类结果(%) Yamaguchi极化特征聚类结果(%) H/A/Alpha极化特征聚类结果(%) 区域1 71.33 78.69 62.28 区域2 71.54 79.17 61.31 -
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