1. 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

3. Raw DINSAR

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

5. Calculation of Glacier Velocities

6. Raw DINSAR

7. Median Filtered DINSAR

8. Gradient Filtered DINSAR

9. Thresholded DINSAR

10. Vectorized DINSAR

11. Displacement towards the Satellite

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

13. Velocity Field of Isachsenfonna

14. Velocity Field of Akademikerbreen

15. Velocity Field of Nordbreen