基于多源遥感影像的南极Lambert流域冰川运动速度提取与精度验证

冰川运动速度是计算极地物质平衡和对冰盖和冰架数值模拟的重要参数.针对传统冰川运动速度提取算法的不足和局限,基于差分干涉技术(DInSAR)和多孔径干涉技术(MAI)开展二维冰川运动速度的提取研究.将该算法应用于南极Lambert流域冰川运动速度的提取,得到了研究区域高精度的二维冰川运动速度场,将采用偏移量跟踪算法提取的冰川运动速度和本文提取的冰川运动速度进行了对比分析和精度评价;结合研究区域已有历史观测数据,分析全球气候变化背景下Lambert流域冰川的动态变化.研究结果表明,基于DInSAR和MAI的冰川运动速度提取算法优于偏移量跟踪算法;近20年的冰川运动速度时间序列数据显示Lambert流域的冰川运动速度基本处于稳定状态.

Estimation and Evaluation of Ice Surface Velocity of Lambert Drainage of East Antarctica by Using Multi-Source Remote Sensing Datasets

Ice surface velocity is one of the essential parameters for evaluating the mass balance and numerical simulation. In this paper, the differential interferometry and multi-aperture interferometry methods was adopted to estimate the two-dimensional ice velocity, and further adopted to derive the two-dimensional ice flow velocity of Lambert Glacier. Finally, the comparison, which between the estimated ice velocity and those obtained by offset tracking method with Landsat 8 images and historical products, was performed to analysis the dynamic characters. The results show that the proposed method is superior to the offset tracking method, and the glaciers in Lambert drainage is stable during the past 20 years.