Monitoring structural deformation is essential for ensuring the safety and longevity of infrastructure. Traditional methods often face limitations in accuracy, efficiency, and spatial assessment. This study aims to combine Global Navigation Satellite Systems (GNSS) and Geographic Information Systems (GIS) to enhance monitoring capabilities by providing highly precise deformation data and enabling real-time analysis for the Fourth Bridge in Al-Marj, Libya. Displacement trajectories along the East, North, and Vertical axes were analyzed using Real-Time Kinematic (RTK) GNSS measurements collected during multiple observation sessions and interpolated with Inverse Distance Weighting (IDW) within ArcGIS. The findings reveal notable spatial and temporal displacements, with IDW-generated maps delineating high-risk zones of structural movement. Red zones signify substantial vertical deformation and potential instability, whereas green zones represent stable areas with minimal movement. Key results highlight localized displacements that warrant further investigation, while other regions remain stable. This research demonstrates the advantages of integrating GNSS and GIS for continuous structural monitoring, offering valuable insights into structural health and facilitating proactive maintenance strategies to enhance bridge safety. By employing GNSS for precise position tracking and GIS for effective spatial data management, this approach advances the detection and analysis of deformations, thereby supporting more informed decision-making in infrastructure maintenance and risk mitigation.
