Université de Fribourg

Monitoring rock glacier kinematics with satellite synthetic aperture radar

Strozzi, Tazio ; Caduff, Rafael ; Jones, Nina ; Barboux, Chloé ; Delaloye, Reynald ; Bodin, Xavier ; Kääb, Andreas ; Mätzler, Eva ; Schrott, Lothar

In: Remote Sensing, 2020, vol. 12, no. 3, p. 559

Active rock glaciers represent the best visual expression of mountain permafrost that can be mapped and monitored directly using remotely sensed data. Active rock glaciers are bodies that consist of a perennially frozen ice/rock mixture and express a distinct flow-like morphology indicating downslope permafrost creep movement. Annual rates of motion have ranged from a few millimeters to...

Université de Fribourg

Mapping slope movements in Alpine environments using TerraSAR-X interferometric methods

Barboux, Chloé ; Strozzi, Tazio ; Delaloye, Reynald ; Wegmüller, Urs ; Collet, Claude

In: ISPRS Journal of Photogrammetry and Remote Sensing, 2015, vol. 109, p. 178–192

Mapping slope movements in Alpine environments is an increasingly important task in the context of climate change and natural hazard management. We propose the detection, mapping and inventorying of slope movements using different interferometric methods based on TerraSAR-X satellite images. Differential SAR interferograms (DInSAR), Persistent Scatterer Interferometry (PSI), Short-Baseline...

Université de Fribourg

Landslide mapping in Switzerland with ENVISAT ASAR

Wegmuller, Urs ; Strozzi, Tazio ; Delaloye, Reynald ; Raetzo, Hugo

In: Geoscience and Remote Sensing Symposium (IGARSS), 2012, p. -

In the frame of the IGARSS 2012 special session on ENVISAT the landslide mapping activities in Switzerland using ENVISAT ASAR data are presented. Between 2005 and 2010 the building up of a well suited archive over the Swiss Alps was realized through programming of all IS2 mode data during the snow free period. In recent years DINSAR and PSI based landslide inventory and monitoring products...

Université de Fribourg

Surface subsidence and uplift above a headrace tunnel in metamorphic basement rocks of the Swiss Alps as detected by satellite SAR interferometry

Strozzi, Tazio ; Delaloye, Reynald ; Poffet, Damien ; Hansmann, Jürgen ; Loew, Simon

In: Remote Sensing of Environment, 2011, p. -

Surface subsidence associated with the construction of a headrace tunnel in the Swiss Alps at more than 2000 m above sea level (a.s.l.) has been detected at two locations with satellite differential Synthetic Aperture Radar (SAR) interferometry. At the first location, a subsidence trough of about 4 cm in the satellite line-of-sight direction following the headrace tunnel axes has been measured...

Université de Fribourg

Combined observations of rock mass movements using satellite SAR interferometry, differential GPS, airborne digital photogrammetry, and airborne photography interpretation

Strozzi, Tazio ; Delaloye, Reynald ; Kääb, Andreas ; Ambrosi, Christian ; Perruchoud, Eric ; Wegmüller, Urs

In: Journal of Geophysical Research, 2010, p. F01014

Recent global warming, through the related retreat of mountain glaciers, causes a growing number of different slope instabilities requiring accurate and cost-effective monitoring. We investigate the potential of combined remote sensing observations from satellite and airborne microwave and optical sensors for an efficient survey of mountainous ground displacements. The evolution of a paraglacial...