Using PS-InSAR with Sentinel-1 Images for Deformation Monitoring in Northeast Algeria

Abstract

Constantine city, Algeria, and its surroundings have always been affected by natural and human-induced slope instability and subsidence. Neogene clay-conglomeratic formations, which form the largest part of Constantine city, are extremely sensitive to the presence of water, which makes them susceptible to landslides. Fast and accurate identification and monitoring of the main areas facing existing or potential hazardous risks at a regional scale, as well as measuring the amount of displacement is essential for the conservation and sustainable development of Constantine. In the last three decades, the application of radar interferometry techniques for the measurement of millimeter-level terrain motions has become one of the most powerful tools for ground deformation monitoring due to its large coverage and low costs. Persistent scatterer interferometry (PS-InSAR) has a demonstrated potential for monitoring a range of hazard event scenarios and tracking their spatiotemporal evolution. We demonstrate the efficiency of Sentinel-1 data for deformation monitoring in Constantine located in the northeast of Algeria, and how an array of information such as geological maps and ground-measurements are integrated for deformation mapping. We conclude this article with a discussion of the potential of advanced differential radar interferometry approaches and their applicability for structural and ground deformation monitoring, including the advantages and challenges of these approaches in the north of Algeria.

Sentinel-1A for monitoring land subsidence of coastal city of Pakistan using Persistent Scatterers In-SAR technique

“…This sensor has several acquisition modes, including interferometric wide (IW), wave (Wave), extra-wide swath (EW), and strip map (SM). When comparing the IW mode to other acquisition modes, it was discovered that the IW mode requires more data processing for co-registration of images with a high precision of up to 0.001 pixels 74 . The 34 images from the ascending track (23 November 2019–23 December 2020) and 32 images from the descending track (20 December 2019–26 December 2020) were collected for this study.…”

“…Because SAR imagery has a high temporal and spatial resolution and a short returning time, it may be used to study subsidence events from satellites 75 . SARPROZ software ( https://www.sarproz.com/sarproz-faq ) was utilized for this research, which is highly beneficial for InSAR data studies and commercial software 74 . SARPROZ has been successfully used, for example, by Qin et al 76 to create a liquefication map of Hong Kong demonstrating the PSI’s precision to the millimeter level.…”

“…5 ). A specified region was evaluated and co-registered during the co-registration phase 74 .

Figure 5 Star graphs depict the perpendicular/temporal baseline distribution of data pairs.

…”

“…PS is chosen in the SARPROZ software process based on the amplitude stability index (ASI). Various atmospheric phase delays impact SAR pictures during acquisitions, and signal interruptions, such as radar signals being affected by aerosol particles, often happen 74 . Multiple spatial–temporal filtrations are employed to compute the Atmospheric phase screen to prevent these disruptions in dataset 79 .…”

Analysis of the Geological Controls and Kinematics of the Chgega Landslide (Mateur, Tunisia) Exploiting Photogrammetry and InSAR Technologies

“…The focus here, in turn, is on a region where RS methods are not yet common. Indeed, the use of InSAR techniques in North Africa is scarcely documented in the literature: Fonseca [19] investigated failure mechanisms of DGSDs in the Rif Mountains (North Morocco) and Beladam et al [20] correlated surface displacements detected by InSAR with known landslides in Constantine (Algeria). Photogrammetry has been applied to aerial photographs to study the El Biar Landslide in Algiers, Algeria [21], but no other publication about North Africa used UAV images until the very recent paper by Bounab et al [22].…”