Bjørn Wangensteen Department of Geosciences University of Oslo September, 2004
Mapping Glacier Velocities at Spitsbergen Using ERS Tandem SAR Data Bjørn Wangensteen*, Dan Johan...
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Transcript of Mapping Glacier Velocities at Spitsbergen Using ERS Tandem SAR Data Bjørn Wangensteen*, Dan Johan...
![Page 1: Mapping Glacier Velocities at Spitsbergen Using ERS Tandem SAR Data Bjørn Wangensteen*, Dan Johan Weydahl**, Jon Ove Hagen* *Department of Physical Geography,](https://reader035.fdocuments.in/reader035/viewer/2022081507/551a6ec6550346545e8b5ffe/html5/thumbnails/1.jpg)
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: [email protected]
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![Page 3: Mapping Glacier Velocities at Spitsbergen Using ERS Tandem SAR Data Bjørn Wangensteen*, Dan Johan Weydahl**, Jon Ove Hagen* *Department of Physical Geography,](https://reader035.fdocuments.in/reader035/viewer/2022081507/551a6ec6550346545e8b5ffe/html5/thumbnails/3.jpg)
Raw DINSAR
![Page 4: Mapping Glacier Velocities at Spitsbergen Using ERS Tandem SAR Data Bjørn Wangensteen*, Dan Johan Weydahl**, Jon Ove Hagen* *Department of Physical Geography,](https://reader035.fdocuments.in/reader035/viewer/2022081507/551a6ec6550346545e8b5ffe/html5/thumbnails/4.jpg)
Theoretical Cross Section of a Glacier Surface in a DINSARbefore and after Unwrapping
![Page 5: Mapping Glacier Velocities at Spitsbergen Using ERS Tandem SAR Data Bjørn Wangensteen*, Dan Johan Weydahl**, Jon Ove Hagen* *Department of Physical Geography,](https://reader035.fdocuments.in/reader035/viewer/2022081507/551a6ec6550346545e8b5ffe/html5/thumbnails/5.jpg)
Calculation of Glacier Velocities
![Page 6: Mapping Glacier Velocities at Spitsbergen Using ERS Tandem SAR Data Bjørn Wangensteen*, Dan Johan Weydahl**, Jon Ove Hagen* *Department of Physical Geography,](https://reader035.fdocuments.in/reader035/viewer/2022081507/551a6ec6550346545e8b5ffe/html5/thumbnails/6.jpg)
Raw DINSAR
![Page 7: Mapping Glacier Velocities at Spitsbergen Using ERS Tandem SAR Data Bjørn Wangensteen*, Dan Johan Weydahl**, Jon Ove Hagen* *Department of Physical Geography,](https://reader035.fdocuments.in/reader035/viewer/2022081507/551a6ec6550346545e8b5ffe/html5/thumbnails/7.jpg)
Median Filtered DINSAR
![Page 8: Mapping Glacier Velocities at Spitsbergen Using ERS Tandem SAR Data Bjørn Wangensteen*, Dan Johan Weydahl**, Jon Ove Hagen* *Department of Physical Geography,](https://reader035.fdocuments.in/reader035/viewer/2022081507/551a6ec6550346545e8b5ffe/html5/thumbnails/8.jpg)
Gradient Filtered DINSAR
![Page 9: Mapping Glacier Velocities at Spitsbergen Using ERS Tandem SAR Data Bjørn Wangensteen*, Dan Johan Weydahl**, Jon Ove Hagen* *Department of Physical Geography,](https://reader035.fdocuments.in/reader035/viewer/2022081507/551a6ec6550346545e8b5ffe/html5/thumbnails/9.jpg)
Thresholded DINSAR
![Page 10: Mapping Glacier Velocities at Spitsbergen Using ERS Tandem SAR Data Bjørn Wangensteen*, Dan Johan Weydahl**, Jon Ove Hagen* *Department of Physical Geography,](https://reader035.fdocuments.in/reader035/viewer/2022081507/551a6ec6550346545e8b5ffe/html5/thumbnails/10.jpg)
Vectorized DINSAR
![Page 11: Mapping Glacier Velocities at Spitsbergen Using ERS Tandem SAR Data Bjørn Wangensteen*, Dan Johan Weydahl**, Jon Ove Hagen* *Department of Physical Geography,](https://reader035.fdocuments.in/reader035/viewer/2022081507/551a6ec6550346545e8b5ffe/html5/thumbnails/11.jpg)
Displacement towards the Satellite
![Page 12: Mapping Glacier Velocities at Spitsbergen Using ERS Tandem SAR Data Bjørn Wangensteen*, Dan Johan Weydahl**, Jon Ove Hagen* *Department of Physical Geography,](https://reader035.fdocuments.in/reader035/viewer/2022081507/551a6ec6550346545e8b5ffe/html5/thumbnails/12.jpg)
Calculation of glacier velocities from DINSAR
Vglac = 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