Data quality comparative analysis of photogrammetric and Lidar DEM

Abstract

Photogrammetry and LiDAR are best-known technologies of mass data collection. In this research, comparison of two DEMs (Digital Elevation Models), created from data collected by LiDAR and photogrammetric technology, was done. In that way it was tried to analyze these two technologies and discuss about their advantages and disadvantages. Research area was area of Petrovaradin (Novi Sad, Republic of Serbia). It was examined difference in heights between the two models, slope, minimum, maximum and mean height. Also, transversal profiles of some objects (the rampart and the tunnel) and places (terrain cover by forest and the coast), from the both models were compared. Statistics was approximately the same, but during the examination of transversal profiles some objects hadn’t been detected on photogrammetric model. LiDAR model has better approximation of terrain in areas covered by forests, because of more ground points, which were detected thanks to laser beam capability to pass through tree canopy and reach the ground. Based on facts obtained during this study, LiDAR technology may be especially useful in archeology, during exploration in dense forests. Based on the performed analysis and the obtained results, in conclusion given are advantages and disadvantages of the obtained height models as well as their areas of application.

Keywords

• photogrammetry
• lidar
• dem
• quality data
• comparative analysis