SAR监测冰川变化研究进展

Glacier Change Monitoring Using SAR: An Overview

遥感现已成为大范围冰川制图与监测的必备手段。合成孔径雷达(SAR)全天候的成像能力,对地表湿度、粗糙度的高度敏感性,以及对地物一定的穿透能力,使其在冰川制图与监测中展现出巨大的潜力。SAR对冰川的制图与监测理论方法还在不断完善,目前正处于快速发展阶段,是冰川遥感研究的一个热点。针对国内外近年来研究进展,对SAR通过散射差异识别雪冰带、监测雪冰界线与冰川物质平衡之间的关联、干涉法与相关算法监测运动速度、干涉生成DEM监测冰川厚度变化等方面的新成果进行论述,阐明了SAR冰川探测的优势和局限性,并对未来若干极具潜力的SAR冰川探测理论和方法进行了展望。

Remote sensing is now widely used in glacier classification and monitoring. The synthetic aperture radar is hardly influenced by weather conditions and sensitive to ground wetness and roughness. Meanwhile, it has the penetration ability to ground objects. So it is promising in glacier mapping and monitoring. Until now SAR ap- plication in glacier is limited in theory and experiments, which is a hot topic in remote sensing of glacier research. This paper reviews the application of SAR in glacier zones recognition using the scattering property difference, flow velocity generation using InSAR and feature tracking, and glacier thickness monitoring using DInSAR generated DEM. The merits and limitations of SAR for glacier monitoring are investigated, and the promising theory and tech- niques for SAR to detect glaciers are introduced.