Structural Deformation Monitoring In Urban Area Using INSAR

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Addis Ababa University


In recent years, space-borne InSAR (interferometric synthetic aperture radar) techniques have shown their capabilities to provide precise measurements of Earth surface displacements for monitoring urban infrastructure. The methodology described in this paper aims at detecting ground motions and structural deformations at the whole city and local scale, In this research, present two test sites studies on how space geodetic tools, especially Radar Interferometry (InSAR), can be used to monitor structural deformation. First, investigate the land subside and uplifting extent and severity area of deformation in the city of Addis Ababa using InSAR. Short wavelength C-band data are explored in this study. The integrated use of interferometric synthetic aperture radar technology for monitoring structural deformation offers several perspectives for investigation of new and aging infrastructure around the city. Spanning almost 12 years space born of observation, and the interferograms produced from the raw ENVISAT and SENTENIEL data to perform classical PS-INSAR analysis in corporate measurement those satellite data. and can be detect a long term maximum land subsidence rate of about -36.78mm/yr measuring at PSINSAR , and minimum 3mm of uplifting are detected. The quantitative validation results of the InSAR-derived deformation trend during the five observation periods are stable with the ADIS GPS station data measured from 2014 to 2018. Overall, the adopted methodology can be used successfully for detection, mapping and monitoring of the subsiding areas vulnerable to future collapse. This will facilitate efficient planning and designing of surface infrastructures and other developmental structures in the urban areas and mitigation management of subsidence induced hazards.



INSAR, tructural Deformation, Urban Area, Deformation Monitoring