Digital Elevation Models (DEMs) are often used for terrain analysis and hydrological modelling. The accuracy of the DEM used play a vital role in terrain and hydrological analysis. Therefore, this study presents a comprehensive assessment of different DEMs using an Integrated GNSS system approach. The study was conducted on Aandhi village, Rajasthan, India by evaluating the accuracy and performance of DEMs to determine the most accurate DEM among ALOS PALSAR (12.5 m), ASTER (30 m), CARTOSAT (10 m), CARTOSAT (30 m) and SRTM (30 m) for the study area and assess its suitability for further analysis and water resource development planning. The methodology involves utilizing an integrated GNSS system to collect high-precision elevation data points. The accuracy assessment was conducted by calculating the various statistical parameters like Root Mean Square Error (RMSE), Mean Absolute Error (MAE), Standard Deviation (SD) and Pearson Correlation Coefficient (R) values of the DEMs based on these points. The study found that CARTOSAT (10 m) DEM had the lowest RMSE value of 2.72, MAE of 2.17 and Standard Deviation of 2.30 indicating its superior accuracy compared to other evaluated DEMs. The results from this study indicate that CARTOSAT with 10 m spatial resolution provides the most accurate representation of the terrain characteristics in Aandhi village. Also, this DEM stands out with more variation values for elevation, slope, and contour, indicating its ability to capture more detailed and varied terrain characteristics. Based on the evaluation of the comparative analysis, the study highlights the suitability of the CARTOSAT (10 m) DEM for further studies in Aandhi village. Overall, this research enhances understanding of different DEMs and their accuracy, contributing to improved geospatial analysis for terrain characteristics and decision-making processes in similar contexts.