Natural coastline extraction based on airborne LiDAR data and tidal estimation

Abstract

Abstract: Coastline is of great importance for coast protection and management. Traditional coastline draughting methods are mainly based on field mapping and remotely sensed images. Field mapping is usually time consuming and difficult to carried out in complicated area. Coastline interpretation requires high criterion for operators and the proper coastline is hard to extract. Aiming at the problems mentioned above, a coastline extraction method for natural coastline based on airborne LiDAR data and tidal estimation was proposed and Feiyantan and Zhifu Island were chosen as study area in this research. Instantaneous water edge was firstly extracted from ortho-rectified images acquired by airborne LiDAR system. Coastline of study area was estimated through tidal data, by utilizing inter-conversion model of elevation system and DEM retrieved by airborne LiDAR system. Compared with “908 coastline”, the RMSE of 3 types of natural coastline (sandy coastline, rocky coastline and silty coastline) extracted using this method are 1.66 m, 5.23 m and 32.48 m, individually. Results show that the method established in this research is efficient and capable of extracting sandy coastline and rocky coastline, without the need of field mapping.

Key words: coastline extraction, LiDAR, remote sensing

CLC Number:

NI Shao-qi, ZHANG Jie, MA Yi, REN Guang-bo. Natural coastline extraction based on airborne LiDAR data and tidal estimation[J]. Journal of Marine Sciences, 2013, 31(3): 55-61.

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