F. Chudy, J. Sadibol, D. Tunak, M. Pasko,B. Belacek, M. Slamova
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-12-4 / ISSN 1314-2704, June 19-25, 2014, Book 2, Vol. 3, 137-144 pp

The identification and mapping of historical anthropogenic and natural relief forms in forest stands by laser scanning and gaining the large-scale aerial photography data is always related to inability of the data collection with the required density of points per square meter with feasible economic costs. This fact leads to inaccuracies or generalizations of digital elevation models. Therefore, the digital terrain model does not provide detailed information that is expected for detailed mapping of micro-relief forms (e.g. for the location of buildings). The studied area is situated in the territory of the University Forest Holding Company in Zvolen. We focused on natural micro-relief forms as well as on anthropogenic form - one-way road to the medieval settlement. The studied area is covered by the broad-leave forest. Our results are based on combination of several procedures and methods. We elaborated digital elevation models by contactless mapping methods. Data of models were compared with data from the fieldwork which were obtained by GNSS and precise electronic tachymeter. Terrestrial scanners or method of terrestrial photogrammetry is used for refinement of data about micro-relief forms in the large scale mapping. In our research we obtained the point clouds by procedures of terrestrial photogrammetry and crucial data were from largescale aerial laser scanning (Riegl LMS Q680i) with assumed average density of 5 points per m2 under the crown canopy of trees and aerial digital photogrammetry - ADP (camera Ultracam Xp) with a geometric resolution of 10 cm. Also we used the resources of terrestrial photogrammetry (Canon EOS 5D MarkII with a 35 mm lens). Measurement of missing data about details of relief forms consume a lot of time while it is done with classical geodetic devices and instruments, and this process requires appreciable experiences in the fieldwork with tachometric methods. Based on a comparison of individual methods, we suggest the most appropriate way of elaboration of precise models with sufficient accuracy and reliability. We combined precious digital models of relief which are based on aerial photography or scanning with interpretations of the terrestrial photogrammetry. Our interpretation of interesting data sources about the relief forms could be implemented into various scientific disciplines (archaeology, landscape ecology, forestry), or in many economic sectors. We achieved significant rationalization in the processing of precise spatial data which were collected and interpreted in a relatively short time. The effectiveness of the workflow rises from a combination of the above mentioned methods.

Keywords: detailed digital terrain models, terrestrial photogrammetry, aerial photogrammetry, airborne laser scanning, mapping of forest environment