ASSESSINGGROUND DISPLACEMENT IN ORAN CITY, ALGERIA:ACOMPARATIVE ANALYSIS OF PSINSAR, SBAS, ANDCOMBINEDMETHOD

Abstract

KEYWORDS PSInSAR, SBAS, combined method, Oran, subsidence 1 INTRODUCTION Interferometric Synthetic Aperture Radar (InSAR) (Zebker and Villasenor, 1992) offers a versatile and efficiënt approach to monitoring land subsidence (Amighpey and Arabi, 2016). lts ability to capture data independently of weather conditions, coupled with its extensive spatial coverage and high resolution, makes it a valuable tooi for investigating historical and ongoing subsidence patterns. From this dataset, a single reference image is selected, carefully considering factors like acquisition time and satellite position to ensure the identification and tracking of stable ground features with reliable radar backscatter known as Persistent Scatterers (PS) across all image pairs (Ferretti et al., 2001; Hooper et al., 2004). [...]it is critical to consider the seismic danger in Oran's urban design and risk management, by establishing suitable prevention and preparedness measures to reduce the possible effects of earthquakes on the people and city infrastructure. The PSInSAR takes advantage of these resilient pixels, known as PS, which serve as reliable anchors, enabling to achieve a remarkable precision in mapping ground deformation rates and temporal evolution down to the millimetre scale (Ferretti et al., 2001; Hooper et al., 2004).