Topography Mapping With a Portable Real-Aperture Radar Interferometer

In this letter, the requirements to derive topography from a portable terrestrial radar interferometer are introduced, the instrument design and the relationship between interferometric phase shift and surface topography are explained, and two examples of topographic maps from measurements at the Rhone glacier and Grabengufer rock glacier in Switzerland are presented. In the first case, an external digital elevation model was used to assess the error of topography mapping with the portable radar interferometer and to analyze ice surface changes of the glacier in the last 14 years. We found that the height error standard deviation is about 3 m within a distance of 2 km from the sensor and observed massive thinning of the Rhone glacier. In the second case, we used the terrestrial radar interferometer in order to measure the height difference between August 2009 and March 2010 over the rock glacier as a consequence of its destabilization.

[1]  Dario Tarchi,et al.  Ground-based SAR interferometry for terrain mapping: theory and sensitivity analysis , 2004, IEEE Transactions on Geoscience and Remote Sensing.

[2]  C. Werner,et al.  PROCESSING STRATEGIES FOR PHASE UNWRAPPING FOR INSAR APPLICATIONS , 2002 .

[3]  Richard M. Goldstein,et al.  Radar ice motion interferometry , 1997 .

[4]  Andreas Kääb,et al.  On the response of rockglacier creep to surface temperature increase , 2007 .

[5]  Shin Sugiyama,et al.  Evolution of Rhonegletscher, Switzerland, over the past 125 years and in the future: application of an improved flowline model , 2007, Annals of Glaciology.

[6]  Ron Kwok,et al.  Measurement of ice-sheet topography using satellite-radar interferometry , 1996 .

[7]  Carlo Atzeni,et al.  Terrain mapping by ground-based interferometric radar , 2001, IEEE Trans. Geosci. Remote. Sens..

[8]  P. Pasquali,et al.  NATIONAL-SCALE DEM GENERATION USING ERS TANDEM DATA IN ALPINE REGIONS , 2000 .

[9]  Dario Tarchi,et al.  Generation of digital terrain models with a ground-based SAR system , 2005, IEEE Transactions on Geoscience and Remote Sensing.

[10]  Frank Paul,et al.  Spatial variability of glacier elevation changes in the Swiss Alps obtained from two digital elevation models , 2008 .

[11]  Charles Werner,et al.  Accuracy of topographic maps derived from ERS-1 interferometric radar , 1994, IEEE Trans. Geosci. Remote. Sens..

[12]  Carlo Atzeni,et al.  DEM by Ground-Based SAR Interferometry , 2007, IEEE Geoscience and Remote Sensing Letters.

[13]  R. Goldstein,et al.  Satellite Radar Interferometry for Monitoring Ice Sheet Motion: Application to an Antarctic Ice Stream , 1993, Science.

[14]  Tazio Strozzi,et al.  Surge-related topographic change of the glacier Sortebræ, East Greenland, derived from synthetic aperture radar interferometry , 2003, Journal of Glaciology.

[15]  C. Werner,et al.  GAMMA ’ S PORTABLE RADAR INTERFEROMETER , 2008 .

[16]  Fuk K. Li,et al.  Synthetic aperture radar interferometry , 2000, Proceedings of the IEEE.

[17]  Andreas Kääb,et al.  Permafrost creep and rock glacier dynamics , 2006 .

[18]  A. Roth,et al.  The shuttle radar topography mission—a new class of digital elevation models acquired by spaceborne radar , 2003 .

[19]  Urs Wegmüller,et al.  A Real-Aperture Radar for Ground-Based Differential Interferometry , 2008, IGARSS 2008 - 2008 IEEE International Geoscience and Remote Sensing Symposium.