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http://dx.doi.org/10.7848/ksgpc.2020.38.3.237

Urban Building Change Detection Using nDSM and Road Extraction  

Jang, Yeong Jae (Dept. of Civil Engineering, Korea Maritime and Ocean University)
Oh, Jae Hong (Dept. of Civil Engineering, Korea Maritime and Ocean University)
Lee, Chang No (Dept. of Civil Engineering, Seoul National University of Science and Technology)
Publication Information
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography / v.38, no.3, 2020 , pp. 237-246 More about this Journal
Abstract
Recently, as high resolution satellites data have been serviced, frequent DSM (Digital Surface Model) generation over urban areas has been possible. In addition, it is possible to detect changes using a high-resolution DSM at building level such that various methods of building change detection using DSM have been studied. In order to detect building changes using DSM, we need to generate a DSM using a stereo satellite image. The change detection method using D-DSM (Differential DSM) uses the elevation difference between two DSMs of different dates. The D-DSM method has difficulty in applying a precise vertical threshold, because between the two DSMs may have elevation errors. In this study, we focus on the urban structure change detection using D-nDSM (Differential nDSM) based on nDSM (Normalized DSM) that expresses only the height of the structures or buildings without terrain elevation. In addition, we attempted to reduce noise using a morphological filtering. Also, in order to improve the roadside buildings extraction precision, we exploited the urban road network extraction from nDSM. Experiments were conducted for high-resolution stereo satellite images of two periods. The experimental results were compared for D-DSM, D-nDSM, and D-nDSM with road extraction methods. The D-DSM method showed the accuracy of about 30% to 55% depending on the vertical threshold and the D-nDSM approaches achieved 59% and 77.9% without and with the morphological filtering, respectively. Finally, the D-nDSM with the road extraction method showed 87.2% of change detection accuracy.
Keywords
nDSM; D-nDSM; D-DSM; Change Detection; Road Extraction; Stereo Satellite Images;
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Times Cited By KSCI : 3  (Citation Analysis)
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