Mapping Glacier Velocities at Spitsbergen Using ERS Tandem SAR

Data

Bjørn Wangensteen*, Dan Johan Weydahl**, Jon Ove Hagen*

*Department of Physical Geography, University of Oslo, PO Box 1042 Blindern, 0316 Oslo, Norway

**Norwegian Defence Research Establishment, Division of Electronics, PO Box 25, 2007 Kjeller, Norway

E-mail: bjorn.wangensteen@geografi.uio.no

Raw DINSAR

Theoretical Cross Section of a Glacier Surface in a DINSARbefore and after Unwrapping

Calculation of Glacier Velocities

Raw DINSAR

Median Filtered DINSAR

Gradient Filtered DINSAR

Thresholded DINSAR

Vectorized DINSAR

Displacement towards the Satellite

Calculation of glacier velocities from DINSAR

Vglac = U / (cos(h)cos()sin()+cos()sin(h))

Velocity Field of Isachsenfonna

Velocity Field of Akademikerbreen

Velocity Field of Nordbreen