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Summary of Proposal GEO0878

TitleHigh resolution DInSAR monitoring of a landslide in Canillo, Andorra
Investigator Mallorqui, Jordi J. - Universitat Politecnica de Catalunya (UPC), Signal Theory and Communications
Team Member
PhD Mallorqui, Jordi Joan - Universitat Politecnica de Catalunya (UPC), Remote Sensing Lab., Dpt. Signal Theory and Communications
Iglesias, Ruben - Universitat Politecnica de Catalunya (UPC), Remote Sensing Lab., Dpt. Signal Theory and Communications
Fabregas, Xavier - Universitat Politecnica de Catalunya (UPC), Remote Sensing Lab., Dpt. Signal Theory and Communications
Aguasca, Albert - Universitat Politecnica de Catalunya (UPC), Remote Sensing Lab., Dpt. Signal Theory and Communications
Monells, Daniel - Universitat Politecnica de Catalunya (UPC), Remote Sensing Lab., Dpt. Signal Theory and Communications
Centolanza, Giuseppe - Universitat Politecnica de Catalunya (UPC), Remote Sensing Lab., Dpt. Signal Theory and Communications
Corominas, Jordi - UPC, Terrain Engineering. Cartography and Geophysics department
Gili, Josep A. - UPC, Terrain Engineering. Cartography and Geophysics department
SummaryThe project is focused in the study of a landslide in Canillo (Andorra) with known recent activity. The landslide was triggered during post-glacial (Holocene) times and has been episodically reactivated by long-lasting rainy periods and foot erosion by the Valira river. This landslide has been instrumented with the support of the Andorran administration and it is currently being studied from a geomechanical point-of-view in order to assess the feasibility for implementing an early warning system. The research is designed with the following OBJECTIVES: Scientific evaluation of the evolution of the landslide with advanced DInSAR techniques employing TerraSAR-X images in High Resolution Spotlight mode. In particular to study the benefits of high resolution images for persistent scatters detection. The benefits of the higher deformation sensitivity and the short revisiting time for landslide monitoring will be also evaluated. Comparison and synergy between TerraSAR-X results and those derived from GB-SAR images obtained through different campaigns and from in-situ measurements (inclinometers and extensometers) and GPS. Improvement in the validation of differential interferometric products in landslide scenarios due to the higher resolution and better geocoding of the results with ground-truth measurements. The following actions constitute the METHODOLOGY proposed for this project: Modification of the data formats and algorithms of the interferometric chain and the coherent pixels technique (CPT) to be adapted to TerraSAR-X data in High Resolution Spotlight mode. Comparison of landslide motion results against values provided by TerraSAR-X and GB-SAR images in X and C bands acquired during different campaigns. Exploration of the synergies between both sensors. Study the benefits of each operation frequency in this kind of movements and partially vegetated scenes. Inclusion of external data on the TerraSAR data processing. The a-priori information of the landslide dynamics obtained with the GB-SAR and the in-situ instrumentation will help to refine the motions obtained from TerraSAR data. Validation of the of the ground displacement results obtained with both sensors, TerraSAR-X and GB-SAR, by comparison with in-situ data (inclinometers and extensometers) and GPS. The following DATA are required for the fulfillment of the project: TerraSAR-X images acquired in High Resolution Spotlight mode over the landslide in a repetitive basis: 11 days cycle and the same configuration with descending orbits. The orientation of the landslide makes that the descending orbit perfectly suited to our objectives. Precise Orbital data of the acquisitions. In situ measurements: topographical control data, ground deformation data (from extensometers devices, topographical surveying, continuous line ground displacement measurement devices, etc), geomechanical properties of landslide material, geological data. DEM of the study area. The main DELIVERABLES of the project are: Ground displacement field maps with fine resolution to establish the landslide pattern. Accuracy of the ground displacement results provided by this technique and cross-validation with GB-SAR data. Identification of landslide movement patterns. Kinematical interpretation of the landslide phenomena. Potential combined technique with the use of both TerraSAR-X and GB-SAR images. Analysis of the potential of TerraSAR-X images for Early Warning Systems

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