Topographic Change Monitoring on Tidal Flat of Suncheon Bay Using Multi-temporal Aerial Images

Abstract

Lee, H. and Kim, C., 2019. Topographic change monitoring on tidal flat of Suncheon bay using multi-temporal aerial images. In: Lee, J.L.; Yoon, J.-S.; Cho, W.C.; Muin, M., and Lee, J. (eds.), The 3rd International Water Safety Symposium. Journal of Coastal Research, Special Issue No. 91, pp. 386-390. Coconut Creek (Florida), ISSN 0749-0208.Suncheon Bay in South Korea is one of the most ecological preserved areas in the world. Monitoring topographical changes of tidal flat and channel is, hence, significantly important in the coastal research community. The main goal of this research is quantitatively finding the volume and area changes in terms of sedimentation and erosion. The elevation changes of the tidal flat and channel are considered as well. Multi-temporal aerial images (years of 1989, 2010, and 2017) are utilized for this research. EOPs (Exterior Orientation Parameters) of the aerial images are first derived using the given IOPs (Interior Orientation Parameters), the measured GCPs (Ground Control Points), collinearity equations, and automated matching technologies. Afterwards, the three DEMs (Digital Elevation Models) for the relevant years are produced using commercial software (i.e., Photoscan). Then, topographic change detection over Suncheon Bay in the period between 1989 and 2017 are carried out. More specifically, LHD (Least squares Height Difference) approach is applied to find out topographic changes between two DEMs for the adjacent years. LHD is selected and adopted in this research because it is more robust than other approaches when large deviations exist between the DEMs. Finally, chronological analysis of the topographic changes over Suncheon Bay is carried out.