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    

基于H/α分解原理的古河道信息提取——以松嫩平原西部地区为例

张森1, 姜琦刚1, 习靖1, 宫昀迪2   

  1. 1. 吉林大学地球探测科学与技术学院, 长春 130026;
    2. 吉林大学地球科学学院, 长春 130061
  • 收稿日期:2020-01-08 发布日期:2020-12-11
  • 通讯作者: 姜琦刚(1964-),男,教授,博士生导师,主要从事遥感地质学方面的研究,E-mail:jiangqigang@jlu.edu.cn E-mail:jiangqigang@jlu.edu.cn
  • 作者简介:张森(1997-),男,硕士研究生,主要从事合成孔径雷达遥感方面的研究,E-mail:812444626@qq.com
  • 基金资助:
    中国地质调查局项目(DD20190536)

Detection of Paleo-Channels Based on H/α Decomposition: A Case Study of Western Songnen Plain

Zhang Sen1, Jiang Qigang1, Xi Jing1, Gong Yundi2   

  1. 1. College of GeoExploration Sicence and Technology, Jilin University, Changchun 130026, China;
    2. College of Earth Sciences, Jilin University, Changchun 130061, China
  • Received:2020-01-08 Published:2020-12-11
  • Supported by:
    Supported by Project of China Geological Survey (DD20190536)

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。

关键词: 松嫩平原, Sentinel-1数据, H/α分解, 古河道

Abstract: Paleo-Channels play an important role in reproducing changes of paleo-climate and paleo-ecological environment. The data of polarimetric synthetic aperture radar (SAR) record the backscattering information of ground objects in the form of scattering matrix, which can be used to effectively identify the hidden paleo-channels information. The Western Songnen Plain was taken as the research area, and the Sentinel-1 VV-VH dual-polarization data were selected as the data source. The H/α VV-VH dual polarization mode of Sentinel-1 was decomposed, and a two-dimensional H/α plane composed of scattering entropy H and scattering angle α was constructed. Based on the fact that there is bulk scattering in the paleo-channel filled with sediments and secondary scattering at the bottom interface of the paleo-channel, and the volume scattering power is greater than the secondary scattering, it is confirmed that the paleo-channel scattering type belongs to the multiple scattering of high entropy H/α plane. Combined with the Sentinel-2 image, the paleo-channel information in the study area is finally extracted. The results show that the paleo-channel information without obvious features in the Sentinel-2 image can be extracted by the H/α decomposition in the VV-VH double-polarization mode.

Key words: Songnen Plain, Sentinel-1 data, H/α decomposition, paleo-channels

中图分类号: 

  • P237
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