Ground deformation has been measured by leveling and GNSS (Global Navigation Satellite System). However, these methods are limited in the number of measurement points, and they may overlook deformation in the area in which no leveling data is available. InSAR (Interferometric Synthetic Aperture Radar) time series analysis can measure ground deformation using SAR (Synthetic Aperture Radar) satellite data, regardless of day and night or weather conditions. Case studies have been reported using this method for analyzing land deformation. However, the applicability of this method to ground deformation monitoring, including accuracy verification, has yet to be sufficiently studied. In addition, satellite observation results cannot be directly compared with leveling survey results because they distort the satellite's line of sight. In this study, we considered the method of deformation observation by performing InSAR time series analysis and selected SBAS (Small Baseline Subset)-InSAR analysis as one of the time series analysis methods to evaluate the large area of ground deformation. The vertical displacement was obtained using 2.5-D analysis, and its accuracy was verified with leveling survey results to study the applicability of SAR satellite in large-area comprehensive land deformation monitoring.