Retrieval of Nearshore Bathymetry around Ganquan Island from LiDAR Waveform and QuickBird Image

Zhang Zhang,Ma Ma,Tian Tian,Jiang Jiang

doi:10.3390/app9204375

Zhang Zhang, Ma Ma + Show 2 more

Open Access

https://doi.org/10.3390/app9204375

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Abstract

Optical remote sensing is an effective means of water depth measurement, but the current approach of mainstream bathymetric retrieval requires a large amount of onsite measurement data. Such data are hard to obtain from places where underwater terrains are complicated and unsteady, and from sea areas affected by issues with rights and conflicts of interest. In recent years, the emergence of airborne light detection and ranging (LiDAR) provided a new technical means for field bathymetric survey. In this study, water depth inversion was carried out around an island far from the mainland by using remote sensing images and real LiDAR waveform data. Multi-Gaussian function fitting was proposed to extract water depth data from waveform data, and bathymetric values were used as control and validation data of the active and passive combination of water depth inversion. Results show that the relative error was 5.6% for the bathymetric retrieval from LiDAR waveform data, and the accuracy meets the requirements of ocean bathymetry. The average relative error of water depth inversion based on active and passive remote sensing was less than 9%. The method used in this study can also reduce the use of LiDAR data and the cost, thus providing a new idea for future coastal engineering application and construction.

Highlights

Water depth is one of the basic elements of seabed topographic mapping and marine environment survey
Remote sensing is an effective complement to traditional bathymetric methods in places where underwater terrains are complicated and unstable, and in sea areas affected by issues with rights and conflicts of interest
Tian [4] improved the method on the basis of the classic Stumpf model to significantly improve water depth inversion ability

Summary

Introduction

Water depth is one of the basic elements of seabed topographic mapping and marine environment survey. The key and basic data provided by water depth monitoring are used in coastal engineering construction, ship navigation, and island development and utilization. The traditional bathymetric method of using ship-borne echo sounding achieved remarkable success. Survey vessels and surveyors cannot carry out the traditional methods in shallow water (0–2 m) due to the influence of tide and submerged reef, indicating a restriction of these methods. Compared with traditional onsite acoustic measurements, the remote sensing inversion of water depth has the advantages of synchronous measurement in large coverage areas, high efficiency, and low cost. Remote sensing is an effective complement to traditional bathymetric methods in places where underwater terrains are complicated and unstable, and in sea areas affected by issues with rights and conflicts of interest

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Results

Conclusion