Mapping bathymetry based on waterlines observed from low altitude Helikite remote sensing platform
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Mapping bathymetry based on waterlines observed from low altitude Helikite remote sensing platform JO Young-Heon1, SHA Jin2, KWON Jae-Il3, 4*, JUN Kicheon3, PARK Jinku1 1 Department of Oceanography, Pusan National University, Busan 609-735, Republic of Korea 2 College of Earth, Ocean, and Environment, University of Delaware, Newark DE 19716, USA 3 Coastal Disaster Research Center, Korea Institute of Ocean Science & Technology, Ansan 426-744, Republic of Korea 4 China-Korea Joint Ocean Research Center, Qingdao 266061, China
Received 4 November 2014; accepted 3 February 2015 ©The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2015
Abstract
Mapping shoreline changes along coastal regions is critically important in monitoring continuously rising sea surface heights due to climate change and frequent severe storms. Thus, it is especially important if the region has very high tidal ranges over very gentle tidal flats, which is a very vulnerable region. Although the various remote sensing platforms can be used to map shoreline changes, the spatial and temporal resolutions are not enough to obtain it for a short time. Accordingly, in this study we introduce the newly developed low altitude Helikite remote sensing platform to achieve much better resolutions of shorelines and a bathymetry. The Helikite stands for Helium balloon and Kite, which is a kind of aerial platform that uses the advantages of both a Helium balloon and a kite. Field experiments were conducted in the Jaebu Island, off the coast of the west Korean Peninsula in January 29, 2011. In order to extract shorelines from the consecutive images taken by the low altitude Helikite remote sensing platform, active contours without edges (ACWE) is used. Edges or boundaries exist primarily on places between one type of objective and the other. Since the hydrodynamic pressure has an effect everywhere, the locations of the waterlines can be the isobath lines. We could map several waterlines, which would enable us to complete a local bathymetry map ranges from 35 to 60 cm depth. The error resulting from applying ACWE algorithm to the imagery to determine the waterline is approximately less than 1 m. Therefore, it is very unique way to obtain such high resolutions of bathymetry with high accuracy for the regions of extremely high tidal ranges for a short time. Key words: Helikite, mapping shoreline, active contours without edges (ACWE), remote sensing Citation: Jo Young-Heon, Sha Jin, Kwon Jae-Il, Jun Kicheon, Park Jinku. 2015. Mapping bathymetry based on waterlines observed from low altitude Helikite remote sensing platform. Acta Oceanologica Sinica, 34(9): 110–116, doi: 10.1007/s13131-015-0730-8
1 Introduction Coastal shoreline changes in response to both tides and sea level rise are an important consideration for coastal scientists, engineers, and those who are engaged in coastal management. Much effort is put in monitoring shoreline changes using various remote sensing platforms such as space-borne, air-borne and low altitude remote sensing pl
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