期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2002
卷号：XXXIV Part 3 A
页码：324-329
出版社：Copernicus Publications
摘要：Algorithmic variations to the glacier motion estimation from differential SAR interferometry are discussed in the present paper. Two efficient albeit relatively simple algorithms for modelling glacier dynamics using spaceborne INSAR data have been devised and tested as alternatives to the conventional DINSAR approach. Neither of the algorithms involves the procedure of interferometric phase unwrapping, thus excluding the areal error propagation and improving the modelling accuracy. In general, they remain feasible even under significant phase noise. An original gradient approach (GINSAR) to differential processing of repeat-pass SAR interferograms based on the calculation of interferometric phase gradients, the generation of glacier slope maps and the analysis of differences between multitemporal slope maps provides global and fast solutions to unsupervised glacier change detection and ice motion estimation. A transferential approach is based on the interferometric measurement of the fast-ice translation forced by the glacier flow and provides good reference values on the glacier frontal velocity and velocity gradients for the GINSAR technique. A comparative analysis of the results obtained by different techniques was performed and algorithmic singularities were discussed. The revealed differences of up to 40% between the GINSAR velocities and those surveyed in the field are explained
关键词：Differential SAR Interferometry; Phase Gradient; Glacier Motion; Velocity; Geodetic Survey
