Ms. Maria Kakavas Profile

Maria Kakavas

at Univ of Patras

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Proceedings Article | 20 October 2015

Karst features detection and mapping using airphotos, DSMs and GIS techniques

M. Kakavas, K. Nikolakopoulos, E. Zagana

Proc. SPIE. 9644, Earth Resources and Environmental Remote Sensing/GIS Applications VI

KEYWORDS: Geographic information systems, Carbonates, Spatial resolution, Remote sensing, Photogrammetry, 3D vision, Environmental sensing, Radar, 3D modeling, Earth observing sensors

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The aim of this work is to detect and qualify natural karst depressions in the Aitoloakarnania Prefecture, Western Greece, using remote sensing data in conjunction with the Geographical Information Systems - GIS. The study area is a part of the Ionian geotectonic zone, and its geological background consists of the Triassic Evaporates. The Triassic carbonate breccias where formed as a result of the tectonic and orogenetic setting of the external Hellenides and the diaper phenomena of the Triassic Evaporates. The landscape characterized by exokarst features closed depressions in the Triassic carbonate breccias. At the threshold of this study, an in situ observation was performed in order to identify dolines and swallow holes. The creation of sinkholes, in general, is based on the collapse of the surface layer due to chemical dissolution of carbonate rocks. In the current study airphotos stereopairs, DSMs and GIS were combined in order to detect and map the karst features. Thirty seven airphotos were imported in Leica Photogrammetry Suite and a stereo model of the study area was created. Then in 3D view possible karst features were detected and digitized. Those sites were verified during the in situ survey. ASTER GDEM, SRTM DEM, high resolution airphoto DSM created from the Greek Cadastral and a DEM from digitized contours from the 1/50,000 topographic were also evaluated in GIS environment for the automatic detection of the karst depressions. The results are presented in this study.

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