This study proposes a vegetation-adaptive coherence threshold method to reduce vegetation-induced decorrelation in small baseline subset interferometric synthetic aperture radar (SBAS‑InSAR) landslide monitoring. By integrating vegetation coverage and the fifth-generation ECMWF atmospheric reanalysis (ERA5)-based atmospheric correction, the method improves deformation accuracy and phase unwrapping. Results show a 29.1 % gain in precision and 22 % more landslide detection.