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Summary of Proposal GEO0764

TitleMonitoring landslide dynamics in Norway using high resolution TerraSAR-X and Radarsat-2 InSAR
Investigator Lauknes, Tom Rune - Norut, Earth Observation
Team Member
Dr. Larsen, Yngvar - Norut, Earth Observation
Dr. Hermanns, Reginald - Geological Survey of Norway, Landslide group
Dr. Dehls, John - Geological Survey of Norway, Landslide group
Dr. Blikra, Lars Harald - Åknes/Tafjord Early Warning Centre, Stranda
SummaryThis TerraSAR-X project will fill the X-band SAR data requirements in the Norwegian Space Centre—funded project "Geohazard-Satellite InSAR for monitoring of Geohazards in Norway". Additional SAR data from Envisat and Radarsat-2 are covered through the ESA project AOALO.3668 and from Norwegian Space Centre/KSAT under the Norwegian-Canadian Radarsat agreement. Objectives Landslides are among the most serious natural hazards in Norway, also because of their tsunamigenic potential, which has taken more than 170 lives in western Norway during the last 100 years. With the increased public attention on these problems in parts of Norway as well as internationally, studies of hazards related to rock slope failures are important activities. The movement rates of the landslides range from a few millimeters to several cm per year. Traditionally, a discrete network of benchmarks have been installed and periodically precisely leveled. Lately, GPS stations have been used, providing a relatively accurate measure of subsidence. Both methods allow the precise monitoring of land deformation at the selected grid of points, but for large areas, the technique is time consuming and expensive. Furthermore, the discrete network is often too sparse to detect localized deformation, and it is not measured frequently enough to be able to monitor rapid hazardous changes. A multi-year study of the geology and landslide hazards on a regional scale in many areas of Norway is currently being undertaken, with geotechnical instrumentation and archived ERS-1/2 SAR data being utilized to understand the spatial and temporal characteristics of the landslides. The objective of this proposed project is to use both Radarsat-2 and TerraSAR-X data to detect and quantify surface movement related to landslides. The above data types would be used to supplement and compare results obtained with the ERS and Envisat data, along with the other geotechnical data to understand the complex landslide movements. The objective of this project is to use X-band data from TerraSAR-X in comparison with C-band data from ERS-1/2, Envisat ASAR, and Radarsat-2, to study landslide surface displacement occuring at different temporal and spatial scales. Method Differential InSAR will be performed to detect fine-scale surface displacements. For time-series analysis, we will be using the short baseline subset (SBAS) method. The effects of wavelength, as well as temporal and spatial resolution will be investigated by using data from multiple sensors and acquisition modes. Data requirements In order to fully assess, and to capture rapid ground displacement changes, we will require acquisitions during two snow-free seasons, over the same areas with the same beam mode. We would like to cover three study areas in Møre og Romsdal County in Norway during two snow-free seasons (approximately 12 scenes each year at each site from approximately May 15 to October 15). Since we are interested in separating vertical and horzontal displacement components, we would like to acquire data from both ascending and descending orbits, with a relatively high incidence angle. In total for two years we request up to 144 TerraSAR-X scenes. We request Single Look Complex data. The minimum requirements for this project are two years of summer season data for one study site. Deliverables We will produce a ground motion map for each sensor and image type, including geology and ground measurements. The final report will compare the results of using different frequencies and spatial resolutions. All results will be published in scientific journals. Source of funding The activities of this project will be part of existing projects, so no additional funding will be required. Software development is currently funded by the Norwegian Space Centre, Norut and the Geological Survey of Norway. Their institutions fund the time devoted to the project by the project participants.

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