DETERMINATION OF SPATIO-TEMPORAL VELOCITY FIELDS ON GLACIERS IN WEST-GREENLAND BY TERRESTRIAL IMAGE SEQUENCE ANALYSIS

• Main Authors: Hans-gerd Maas, Ellen Schwalbe, Reinhard Dietrich, Michael Bässler, Heiko Ewert
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: KEY WORDS; Glaciology; Motion analysis; Image sequences; Eqip Sermia; Greenland; Qarajaq; glacier
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.184.4004; http://www.isprs.org/proceedings/XXXVII/congress/8_pdf/16_SS-12/01.pdf

Some glaciers in Greenland are currently showing dramatic changes: A fast retreat of the glacier front, thinning and acceleration of glacier movement. As a prominent example, Jacobshavn Isbræ glacier has accelerated from 20 meters per day to 40 meters per day within a few years. These effects can very well be observed by photogrammetric and remote sensing techniques. In the paper, we report on recent measurements at three glaciers in West Greenland: Jacobshavn Isbræ, Eqip Sermia and Støre Qarajaq. The paper will concentrate on the determination of spatio-temporal velocity fields from high resolution terrestrial image sequences captured by a 39-Megapixel camera. In addition, the glacier front retreat has been mapped from multi-temporal satellite images, and a terrestrial laserscanner has been used to determine glacier surface models and glacier motion from multiple scans. The results of the photogrammetric measurements form a valuable basis for glaciological research on the changing behavior of glaciers. 1.