1. 登录 | 注册 | 用户中心 | 关于平台 | 中国科学院
当前位置:成果展示 > 成果详情

Recognition of supraglacial debris in the Tianshan Mountains on polarimetric SAR images

  • [设施]:遥感飞机
  • [期刊/会议名称]:Remote Sensing of Environment
  • [摘要]:Debris cover is widely present in the ablation areas of mountain glaciers. Such debris plays an important role in glacier mass balance, but it complicates the glacier boundary and area estimation when using remotely sensed images. Automatic recognition of the debris is much more difficult than recognizing bare ice on optical remotely sensed images because the debris has almost the same spectral characteristics of the surrounding.terrain. In this paper, the scattering characteristics of the debris on the C-and L-band polarimetric SAR images are presented and analyzed to study the possibility of recognizing debris thickness and extent. The Koxkar glacier, in the central Tianshan Mountain Range, was selected as the study area. It was found that debris is distinct from bare ice in cross polarization (HV) of both the L-and C-bands. The L-band volume scattering component, acquired from target decomposition, increases with debris thickness when the debris is less than 25 cm deep, but the volume scattering does not increases if the debris is thicker than 25 cm. In contrast, the C-band SAR data does not appear to be sensitive to debris thickness. This difference may be caused by different radar penetration depth of the debris. On the basis of the polarimetric property analysis, two methods were developed to determine the extent of the debris. In the first method, the simple threshold to distinguish debris from non-debris areas is presented. Using this threshold, approximately 90% of the debris can be recognized. In the second method, by combining more polarimetric features and support vector machines, recognition of debris reaches an accuracy greater than 95%. (c) 2014 Elsevier Inc All rights reserved.
  • [发表日期]:2016
  • [第一作者]:黄磊
  • [第一作者单位]:中科院航空遥感中心
  • [通讯作者]:李震
  • [通讯作者单位]:中科院航空遥感中心
  • [论文类型]:SCI期刊
  • [期刊分类]:REMOTE SENSING(SCI1区)
  • [学科分类]:
  • [影响因子]:6.393
  • [关键词]:Glacier; Debris; Polarimetric SAR; Classification
  • [卷号]:
  • [期号]:145
  • [起止页码]:47-54
  • [简介]: