Supervisors info:
Ευθύμιος Λέκκας, Καθηγητής, Τμήμα Γεωλογίας και Γεωπεριβάλλοντος, Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών
Στυλιανός Λόζιος, Επίκουρος Καθηγητής, Τμήμα Γεωλογίας και Γεωπεριβάλλοντος, Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών
Εμμανουήλ Βασιλάκης, Επίκουρος Καθηγητής, Τμήμα Γεωλογίας και Γεωπεριβάλλοντος, Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών
Summary:
During field mapping, many problems arise as to the accessibility of each study area and hence the examination of its structures due to its particular physio – geographic characteristics. The use of aerial photographs has previously been the solution to such problems. Recently, however, there has been a booming of the structure for Motion (SfM) photogrammetry applied through Unmanned Aircraft Systems (UAS) not only in geosciences, but in other sciences as well. Thus, it is possible to identify, accurately study and interpret the structures (for example, fault surfaces). So, in addition to the fieldwork where this was possible, there is also the ability of taking photos and videos with drone as an auxiliary method in mapping and in structural analysis οn steep slopes and specifically in quarries in the areas of Kaisariani of Mt. Hymitos and Volakas of Mt. Falakro (Drama). The process of mapping characteristic structures in the two study areas is described in detail. In the case of Kaisariani area, data obtained through drone and field work are used, while in the case of Volakas area, only imagery from drone flights is used. Flight plans were different in each case. In both cases, characteristic structures are identified, characterized and digitized and conclusions were drawn about them and the effectiveness of the combination of use of field and drone data. Digital Surface Models (DSMs), orthomosaic maps, Digital Terrain Models (DTMs) are produced through the processing of data acquired from drone. These maps are used to examine the structures of the study areas. Surface data are calculated, Schmidt network densities, corresponding rose diagrams and cyclographic projections of major surfaces are created, and morphological slope maps are generated. The three – dimensional imaging and study of the two study areas and their entire structure, even those not exposed to the slopes, is given. This explores how drone can contribute to the geological and tectonic mapping process, and how this can be achieved. In the framework of the methodology developed, the advantages and the problems arising from each method are highlighted, as well as the ways of correcting or avoiding any errors. Having applied as much homogeneity as possible, the single statistical sample of the measurements is interpreted, taking into account the extent to which and in which structures many measurements could be made. Finally, the crucial role of drone data acquisition in quarry operations is understood, as it is possible to safely map the deposits.
Keywords:
UAS, 3D imaging, geological mapping, structural analysis, Mt. Hymitos, Drama, quarries
