Applications of airborne laser scanning for determining marine geoid and surface waves properties

European Journal of Remote Sensing

Sander Varbla¹  Artu Ellmann¹  Nicole Delpeche-Ellmann² 

[1] Department of Civil Engineering and Architecture, Tallinn University of Technology, Tallinn, Estoni;Department of Cybernetics, Tallinn University of Technology, Tallinn, Estoni;

关键词: Airborne laser scanner;    dynamic topography;    geoid;    hydrogeodesy;    sea surface height;    wavefield;   

DOI  :  10.1080/22797254.2021.1981156

来源: Taylor & Francis

【 摘 要 】

Marine and coastal applications require now more than ever accurate and expansive understanding of the marine surface topography in the offshore domain, with the relationship of sea surface heights and geoid (equipotential surface of the Earth) being the key components. This study demonstrates some of the under-utilised and unexplored marine applications of airborne laser scanning (ALS) with respect to geoid heights verification and validation, as well as identification of surface waves properties. A synergistic methodology was developed that combines ALS measurements, hydrodynamic models and tide gauge records in conjunction with geoid models. Examination of the determined discrepancies with respect to the ALS-derived sea surface heights reveals concealed characteristics of the geoid and dynamic topography. A sea surface height accuracy of 1.7 cm in terms of standard deviation was achieved using a high-resolution regional geoid model. Furthermore, ALS point cloud data can be used to retrieve surface wavefield properties (waves heights, wavelengths and directions). In this study a direct method approach is presented. Such a deeper insight into the wave dynamics plays an enormous contribution in the understanding and quantification of coastal processes (erosion and sediment transport), as well as validation and calibration of wave models and relevant sensors.

【 授权许可】

CC BY