Glacier mass change evaluation in Lambert-Amery Area from 2002 to 2012 using ASTER stereo images and ICESat GLAS laser altimetry

35th International Symposium on Remote Sensing of Environment

地球科学;生态环境科学

Liu, Jun^1,2 ; Tong, Xiaohua^1,2 ; Liu, Shijie^1,2 ; Liu, Shuang^1,2 ; Li, Lingyun^1,2 ; Hong, Zhonghua^1,2 ; Xu, Yusheng^2

Center for Spatial Information Science and Sustainable Development, Tongji University, Tongji 200092, China^1

College of Surveying and Geo-Informatics, Tongji University, Tongji 200092, China^2

关键词: Density modeling;    Laser altimetry;    Linear Interpolation;    Reference frame;    Rigid body transformation;    Sets of features;    Surface elevations;    Terrain features;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/17/1/012136/pdf
DOI  :  10.1088/1755-1315/17/1/012136

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Currently, one of the major issues is to transform different remote sensing observations into a global reference for sustainable global-scale glacier change monitoring. In order to put glacier changes into a broader temporal context, it is desirable to extend the glacier observation time as far back as possible. In this paper, we present a case study of registering ASTER satellite stereo images to ICESat GLAS laser altimetry data, by matching terrain features identified from the ICESat measurements to those corresponding in the ASTER images. Features like ridges and nunatak can be extracted from ICESat data, and these features can also be measured in ASTER stereo images. A rigid body transformation (3 translations, 3 rotations) is applied for an optimal fit of these two sets of feature points. After transforming the ASTER photogrammetry measurements into the ICESat reference frame, we compute elevation change rates at each ICESat point by using a linear interpolation to obtain an estimate of surface elevation from ASTER. The surface firn/ice density model is used in converting the elevation changes to mass changes. Our study indicates that Lambert Glacier is close to being in mass balance between 2002 and 2012.