吉林大学学报(地球科学版) ›› 2020, Vol. 50 ›› Issue (6): 1905-1916.doi: 10.13278/j.cnki.jjuese.20200008
• 地球探测与信息技术 • 上一篇
张森1, 姜琦刚1, 习靖1, 宫昀迪2
Zhang Sen1, Jiang Qigang1, Xi Jing1, Gong Yundi2
摘要: 古河道对于重现古气候、古生态环境变化有着重要的意义。极化合成孔径雷达(SAR)数据以散射矩阵的形式记录了地物的后向散射信息,能有效地识别隐伏的古河道信息。本文以古河道发育的松嫩平原西部作为研究区域,选取Sentinel-1双极化数据(VV-VH)作为数据源,通过VV-VH双极化模式下的H/α分解处理,构建了由散射熵H与散射角α构成的二维H/α平面。依据雷达波在古河道充填沉积物中发生体散射以及在古河床底界面发生二次散射,并且体散射功率大于二次散射功率,确定了古河道散射类型属于H/α平面上的高熵多次散射。结合此特征与Sentinel-2影像,最终对研究区内的古河道信息进行了提取。研究表明,通过VV-VH双极化模式下的H/α分解方式可以提取到在Sentinel-2影像上无明显特征的古河道信息。
中图分类号:
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