A GIS-Based Comparative Study of Modified Analytic Hierarchy Process and Modified Frequency Ratio for Landslide Susceptibility Mapping Along Hoang Sa Road, Da Nang, Vietnam

Abstract

This study presents a GIS-based approach for landslide susceptibility mapping (LSM) along the Hoang Sa street in the Son Tra Peninsula, Da Nang City, Vietnam, using the Modified Frequency Ratio (MFR) and Modified Analytic Hierarchy Process (MAHP) methods. Nine factors, including geology, rainfall, slope, aspect, land use, and distance to road, distance to streams, landslide density, vertical relief were integrated with a landslide inventory of 37 events (2020-2025). Model performance was evaluated using the Receiver Operating Characteristic (ROC) analysis, showing that the MFR model, with an area under the curve (AUC) of 0.85, outperforms the MAHP model (AUC $=0.73$). The landslide susceptibility map derived from the MFR model was classified into five categories: very low (1.32-2.00), low (2.01-2.56), moderate (2.57-3.14), high (3.15-3.67), and very high (3.68-4.93). The findings provide a useful basis for landslide risk assessment and slope management.