摘要
冰川运动是冰川及冰川湖危险性评估的重要依据。高分三号作为中国首颗民用星载合成孔径雷达卫星,因其全天时、全天候以及高空间分辨率的特点在冰川运动监测中有着重要优势。利用5景精细条带2成像模式的高分三号影像,应用偏移量跟踪技术监测了念青唐古拉山依嘎冰川在2017-11—2018-03期间4个时段的运动分布情况。通过与高分三号影像时间分布类似的两景Sentinel-1影像的偏移量跟踪结果进行对比,并基于研究区基岩运动速度应为0的假设,计算了高分三号各个时段结果基岩区的速度残差,评估了高分三号影像在冰川表面运动监测中的适用性。高分三号监测结果表明,4个时段依嘎冰川表面具有相似的流速分布,其表面速度最大处均分布在冰川表面高程变化最剧烈的中部,且与基于两景Sentinel-1影像的偏移量跟踪结果在总体强弱态势上吻合;各个时段高分三号监测结果基岩区速度残差的均方根误差分别为1.4 cm/d、2.0cm/d、1.7 cm/d、2.3 cm/d,验证了利用高分三号影像监测依嘎冰川表面运动的可靠性。以上分析结果表明,高分三号影像可作为冰川表面运动监测的常规数据来源之一。由于高分三号同时具有高空间分辨率和高性价比的特点,因此它能为中国冰川遥感监测发挥独特作用。
Glacier motion represents a significant reference for the hazard assessment of glacier and glacial lakes.GF-3,as the first civil spaceborne synthetic aperture radar satellite in China,has important advantages in monitoring glacier motion due to its characteristics of all-weather,all-time capabilities and high spatial resolution.Based on five GF-3 images with FSⅡimaging modes,the surface velocities of the Yiga Glacier,located in Nyenchen Tonglha Mountains,are estimated over five time periods using offset tracking technique during November 2017 to March 2018.The results were compared with the offset tracking results of Sentinel-1 images which have a similar time with GF-3 image and based on the assumption that the velocity of the bedrock in the study area should be 0,the velocity residuals of the bedrock in each period are calculated,then the applicability of GF-3 image in monitoring glacier surface motion was evaluated.The results of GF-3 data show that the distribution of the Yiga Glacier motion is similar in four periods,and the maximum surface velocities are all distributed in the central part of the glacier where the elevation changes dramatically.Meanwhile,the results are consistent with the results of Sentinel-1 based on two images.The RMSEs of velocity residuals in the bedrock area in four periods are 1.4 cm/d,2.0 cm/d,1.7 cm/d and 2.3 cm/d,respectively,which validate the reliability of the deformation estimated used GF-3 images in this paper.Based on the above analysis,GF-3 SAR data can be used as one of the conventional data sources for monitoring glacier surface movement.Because of its high spatial resolution and high cost performance,GF-3 can play a unique role in monitoring the motions of glaciers in China.
作者
王群
张蕴灵
范景辉
傅宇浩
WANG Qun;ZHANG Yunling;FAN Jinghui;FU Yuhao(China Highway Engineering Consultants Corporation,Beijing 100097,China;Research and Development Center of Transport Industry of Spatial Information Application and Disaster Prevention and Mitigation Technology,Beijing 100097,China;China Highway Engineering Consultants Corporation Data Co.Ltd.,Beijing 100097,China;China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China)
出处
《武汉大学学报（信息科学版）》
EI
CSCD
北大核心
2020年第3期460-466,共7页
Geomatics and Information Science of Wuhan University
基金
国家重大科技专项(07-Y30B10-9001-14/16)
中欧科技合作“龙计划”四期(32365)
中国地质调查局地质调查项目(DD20190515).
作者简介
第一作者:王群,硕士,助理工程师,主要从事InSAR技术应用与研究。wangq0723@163.com;通讯作者:范景辉,博士,教授级高级工程师。jhfan2004@qq.com
