Geodetski Vestnik (Jan 2007)
Test uporabnosti interaktivne metode orientacije na primeru posnetkov Triglavskega ledenika : Test of the interactive orientation method on the example of the Triglav glacier
Abstract
The interactive method of orientation between 2D photographs and a 3D height model presented with a point cloud is described. The orientation parameters of the 2D photograph (rotations and location of the camera) are derived using the interactive searching for the best fit of the projected 3D height model points on the image. This method requires good operator’s knowledge of the photograph and its details and above all a lot of time. The most suitable photographs for the interactive method of orientation are the panoramic ones, with removed distortions. On the photograph there should be many easily found targets or details (edges ...). The method was developed for the error search in the laser scanning point cloud (Rönnholm et al., 2003a, 2003b). In this paper a test of the usefulness of the interactive method of orientation on the example of Horizont nonmetric panoramic photographs of the Triglav glacieris presented. Because of the lack of good details seen on the photographs and in the 3D model, we derived only approximate values for the orientation parameters. Unfortunately this is not enough for conducting measurements of height difference out of the Horizontphotograph. If correct values of orientation were available, the height differences between the 3D model and photographs could be measured. This would be done with shifts of the 3D point images on two Horizont photographs, so that they would fit the photographsbetter. The 3D model presents the state of the Triglav glacier in the year 2005. The Horizont photographs present the state of the glacier in each month from 1976 on.
