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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

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Raw DINSAR

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Theoretical Cross Section of a Glacier Surface in a DINSAR before and after Unwrapping

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Calculation of Glacier Velocities

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Raw DINSAR

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Median Filtered DINSAR

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Gradient Filtered DINSAR

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Thresholded DINSAR

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Vectorized DINSAR

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Displacement towards the Satellite

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Calculation of glacier velocities from DINSAR V glac = U / (cos(h)cos( )sin( )+cos( )sin(h))

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Velocity Field of Isachsenfonna

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Velocity Field of Akademikerbreen

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Velocity Field of Nordbreen

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