Zusammenfassung
Summary
Since 3D laser scanners were introduced more than ten years ago, engineering surveyors have been producing georeferenced point clouds and deriving 3D models. Photogrammetry seemed to have become obsolete. In the last few years however, the algorithmic processing of dense picture collections has made significant progress. The complex algorithms for camera calibration, image alignment, feature extraction needed to obtain dense 3D point clouds have been implemented into programs that are fairly easy to use. With this, engineering surveying has gained access to yet another tool. In this article three skilled users describe theory, procedures and practical examples from their point of view.