Terrestrial Scanning / Topography & Monitoring

E. Schwalbe, H-G. Maas, R. Dietrich, H. Ewert "Glacier Velocity Determination from Multi Temporal Terrestrial Long Range Laser Scanner Point Clouds" 24.10.2008

The goal of the research work presented here was to determine spatio-temporal velocity fields at the glacier tongue of Jacobshavn Isbrae using photogrammetric methods. In 2004, a measurement campaign has been conducted in order to determine the glaciers movement characteristics using image sequence analysis. Velocities up to 40 m/d could be observed.
In a second campaign in 2007, multitemporal terrestrial laser scanner data were acquired in addition to the high-resolution terrestrial image sequences with the goal of determining glacier surface velocity fields.
A cross correlation technique for the determination of glacier surface velocity vectors is developed. We address some specific technical problems and describe a scheme for correcting timing and angular reference effects on the data. Finally glacier surface velocity fields obtained from the new described method are shown.