Mapping of the 3D Surface Motion Field of Doesen Rock Glacier (Ankogel Group, Austria) and its Spatio-Temporal Change (1954 - 1998) by Means of Digital Photogrammetry

Graz

Universität Graz

2007

S. 137-144

10 Abb., 2 Tab., 17 Lit. Ang.

Artikel aus einer ZeitschriftUnselbständiges Werk

200151966

Proceedings of the 9th International Symposium on High Mountain Remote Sensing Cartography held in Graz, Austria, 14-15 September 2006 : Symposium, S. 137-144

Doesen rock glacier (46°59ĘN, 13°17ĘE, altitude range 2339-2650 m, width 150-300 m, length 1000 m) is located in the Ankogel group of the Hohe Tauern range in Austria. The rock glacier has been the subject of multi-disciplinary research work since 1994. For example, the kinematics of Doesen rock glacier has been studied by means of geodetic surveys and remote sensing techniques, i.e., photogrammetry and satellite-based differential SAR interferometry. The 3D motion fi eld of Doesen rock glacier was photogrammetrically obtained from multi-temporal aerial photographs from various epochs between 1954 and 1998. This heterogeneous set of photographs was evaluated twice, (1) by means of visual tracking of prominent surface particles (boulders) in the 3D stereomodels and (2) by applying automatic image matching techniques. The latter method, however, was not successful from a practical point of view, since the photogrammetric scanner used for digitizing the aerial photographs introduced geometric errors in the scans which could not be eliminated during the evaluation process. The present paper describes a second attempt to apply the same algorithms (ADVM software) to the newly digitized aerial photographs, this time using an UltraScan 5000 photogrammetric scanner of Vexcel Imaging Austria. We will briefl y outline our approach of measuring 3D displacement vectors, and the practical work and the results obtained will be presented. A comparison of the results of the two photogrammetric evaluation processes, i.e., manual mapping and image matching, is given.