| Summary: Current (vector) map is a type of map that shows objects such as man-made roads, buildings as well as earth topography and provides three-dimensional (3D) information. One of the layers that should be specifically represented on these maps is the location and height information of the plain earth, which is represented by the contour lines produced by different methods. In recent years, there have been significant improvements in 3D point acquisition methods, and air laser scanning technology (LiDAR) or image matching from digital aerial photographs and point cloud production methods have been widely used. In this thesis, it is aimed to reveal the height layer required for the current map as a result of filtering the point cloud produced through digital aerial photographs, and that this model is accurate and usable compared to the previously produced height model. In this context, a different number and density of points were determined for the ground extraction of the produced point clouds and the related land model was extracted with the LAStools academic software Lasground module. As a result of the study, it is concluded that it is possible to use the terrain model obtained from the point cloud produced by the faster and more effective method instead of classical methods in the current maps. According to the results obtained, it was concluded that with the point cloud data produced from the images, height layer can be produced ideally to be used in maps of 1/2000 and smaller scale.
Key Words: Dense Image Matching, Digital Photogrammetry, Progressive TIN Densification, ALS Filtering. |
