Upload
hassan-bidwell
View
233
Download
9
Tags:
Embed Size (px)
Citation preview
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]
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