Comparative Study on Digital Terrain Models Created Based on ALS Data and Pleiades Images

Digital terrain models are used in a wide variety of domains and applications, of which the most important are: orthorectification of aerial and satellite images, space object modelling, hydrological modelling, etc. There are several techniques for data acquisition in order to create digital terrain models, such as photogrammetry, radargrammetry, interferometry, airborne laser scanning, surveying and geodetic and cartographic digitization. This paper aims to present a comparison betweenthe digital terrain models created based on ALS data, respectively Pleiades satellite images. To achieve results, first was created the digital terrain model based on ALS data, using an interpolation grid side of 1m and moving planes interpolation method. Then, the digital terrain modelof the same area, was created based on highly dense point cloud, obtained automatically by matching two Pleiades images, using the feature-based and least-squares matching techniques. A comparative study was made on these two digital terrain models, by performing the vertical differencebetween them, using the Hausdorff distance