Determination of spatio-temporal velocity fields at Grey Glacier using terrestrial image sequences and optical satellite imagery

Since several years most glaciers all over the world are showing increasing retreat, thinning and acceleration. To understand and model the phenomena as well as to predict the future development of ice fields and glaciers, glaciologists need different data that describe the glaciers condition. Therein, an important issue is the determination of velocity fields. These can be derived using remote sensing as well as terrestrial methods. In the paper we introduce both a terrestrial image sequence as well as a satellite image-based technique for the analysis of the motion behaviour of Grey Glacier in the Southern Patagonian Icefield.