基于Landsat-8时间序列影像分析西昆仑山地区冰川滑移特征

利用图像亚像元互相关分析方法处理了Landsat-8卫星获取的时间序列影像数据，得到中国青藏高原西北部地区西昆仑峰区冰川匀速滑移的时空演化过程。利用亚像元影像互相关技术对Landsat-8光学影像精确配准，配准精度达到0.01像元，即该光学影像的水平形变监测精度达到0.15 m。通过对2013-07～2014-08的15景Landsat-8影像进行互相关和形变时间序列反演分析，获得了西昆仑峰区两条冰川的滑动位移场和速度场。研究表明，该区域的冰川基本处于匀速滑移状态（无明显加速和减速现象）；同时也验证了Landsat-8光学影像在监测较大地表位移和地壳形变事件（如沙丘移动、地震、滑坡、火山等）上的应用潜力。

Fast and Uniformly Slipping Western-Kunlun Glaciers from Time-series Deformation Analysis Using Periodically Captured Landsat-8 Imagery

We processed time-series data,using a sub-pixel cross-correlation analysis method, to obtain the temporal evolution of the surface displacements of the west Kunlun mountain glaciers in the north-western Tibetan plateau. This work co-registers periodically acquired Landsat-8 images using the sub-pixel cross-correlation technique at an accuracy of 0.01 pixels, implying a horizontal displacements detecting precision of the optical image 0.15 m. By cross-correlation analysis of the Landsat-8 images acquired from July 2013 to August 2014 and time-series inversion, this study constructs the displacement and velocity fields of two glaciers in the west Kunlun mountains. It demonstrates that the glaciers in the study area are slipping fast and uniformly (no obvious acceleration or deceleration). Based on Landsat-8 images, the method of this study can potentially be used for measuring ground deformation caused by dunes shifting, earthquakes, landslides, or volcanoes etc.