Digital elevation model, acquired and generated using manual field survey, stereo pairs, interferometric synthetic aperture radar (InSAR) and light detection and ranging techniques to characterize terrain topography, plays a dynamic role in geological and hydrological applications. Digital elevation models (DEMs) are subjected to comprise ineradicable faults owing to acquirement techniques and pre-processing methodologies. Experiencing non-uniform variation in accuracy, it is mandatory to assess the accuracy of DEMs before employing it for numerous purposes. Considering the fact, assessment of vertical and horizontal accuracies of open-access DEMs and InSAR-derived DEM is performed with Survey of India (SOI) toposheets as reference. Results concluded that Cartosat DEM and SRTM DEM of 30 m resolution with NRMSE as 10.5% and 10%, respectively, and PBIAS as − 0.3% and − 0.5% respectively highly correlated with the toposheet elevation when compared with other DEMs. Horizontal assessment of pixel offset concluded that Cartosat and SRTM DEM experience an offset of 0.1% along X-axis and 0.33% along Y-axis. Assessment of vertical accuracy and pixel offset concluded that CartoDEM and SRTM DEM are highly recommended for research purposes over Kodagu District, Karnataka, India. InSAR-derived DEM experiences massive variation and are not suggested over hilly terrains.

使用人工现场勘测，立体对，干涉合成孔径雷达（InSAR）以及表征地面地形的光检测和测距技术获取和生成的数字高程模型在地质和水文应用中起着动态作用。由于获取技术和预处理方法的原因，数字高程模型（DEM）遭受了无法修复的故障。由于精度存在不均匀的变化，因此必须先评估DEM的准确性，然后再将其用于多种目的。考虑到这一事实，对开放式DEM和InSAR衍生的DEM的垂直和水平精度进行了评估，并参考了印度调查（SOI）拓扑表。结果得出结论，分辨率为30 m的Cartosat DEM和SRTM DEM的NRMSE分别为10.5％和10％，与其他DEM相比，分别为-0.3％和-0.5％的PBIAS和PBIAS与地形板高度高度相关。像素偏移的水平评估得出的结论是，Cartosat和SRTM DEM沿0.1％的偏移X轴和Y轴的0.33％。垂直精度和像素偏移的评估得出结论，强烈建议在印度卡纳塔克邦Kodagu区进行研究时，建议使用CartoDEM和SRTM DEM。InSAR衍生的DEM会发生巨大变化，因此建议不要在丘陵地形上使用。