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：2010
卷号：XXXVIII - Part 5
页码：417-421
出版社：Copernicus Publications
摘要：The paper describes an approach to determine spatio-temporal velocity fields at Glaciar San Rafael in the Northern PatagonianIcefield by terrestrial image sequence analysis. It discusses image acquisition schemes and concentrates on aspects of glacier surfacefeature tracking, georeferencing and trajectory precision.Glaciar San Rafael in the Northern Patagonian Icefield, with a length of 51 km and an ice area of 722 km2, is the lowest latitudetidewater outlet glacier in the world and one of the fastest and most productive glaciers in southern South America in terms oficeberg flux. In a joint project of the TU Dresden and CECS, spatio-temporal velocity fields in the region of the glacier front weredetermined in a campaign in austral spring of 2009. Monoscopic terrestrial image sequences were recorded with an intervallometermode high resolution digital camera over several days. In these image sequences, a large number of glacier surface points weretracked by subpixel accuracy feature tracking techniques. Scaling and georeferencing of the trajectories obtained from image spacetracking was performed via a multi-station GPS-supported photogrammetric network.The technique allows for tracking hundreds of glacier surface points at a precision in the order of one decimeter and an almostarbitrarily high temporary resolution. The results show velocities of up to 16 meter per day, which is in accordance with formermeasurements. A significant tidal signal, as theoretically predicted by other authors, could not be observed. As a by-product, amaximum value of 55 meter could be determined for the glacier front height
