UAS PHOTOGRAMMETRY AND OBJECT-BASED IMAGE ANALYSIS (GEOBIA): EROSION MONITORING AT THE KAZÁR BADLAND, HUNGARY

• Main Authors: LÁSZLÓ BERTALAN, ZOLTÁN TÚRI, GERGELY SZABÓ
• Format: Article
• Language: English
• Published: University of Debrecen 2016-09-01
• Series: Acta Geographica Debrecina: Landscape and Environment Series
• Subjects: badland; photogrammetry; GEOBIA; UAS; erosion; gully; rill
• Online Access: http://landscape.geo.klte.hu/pdf/agd/2016/2016v10is3_4_10.pdf

A remarkable badland valley is situated near Kazár, NE-Hungary, where rhyolite tuff outcrops as greyish white cliffs and white barren patches. The landform is shaped by gully and rill erosion processes. We performed a preliminary state UAS survey and created a digital surface model and ortophotograph. The flight was operated with manual control in order to perform a more optimal coverage of the aerial images. The overhanging forests induced overexposed photographs due to the higher contrast with the bare tuff surface. The multiresolution segmentation method allowed us to classify the ortophotograph and separate the tuff surface and the vegetation. The applied methods and final datasets in combination with the subsequent surveys will be used for detecting the recent erosional processes of the Kazár badland.