Bathymetry from Images, LiDAR, and Sonar

Airborne Lidar Bathymetry

LiDAR Bathymetry for Nautical Charting

Safety Of Life at Sea (SOLAS) is the overarching principle for all offshore operations and one of the major contributing factors to SOLAS is quality navigational charts that are comprehensive and adhere to International Hydrographic Organisation (IHO) established standards of accuracy. However, a chart is only as good as the data that is used to compile it and one of the more challenging areas ...

River bathymetry from conventional LiDAR using water surface returns

LiDAR–based DEMs are almost essential when it comes to high resolution floodplain modelling. Conventional LiDAR does not penetrate water bodies and additional bathymetric measurements are necessary to complete any parts of a DEM which were under water at the time of the LiDAR sortie. Bathymetric data collection is time-consuming, expensive and it requires careful processing to correctly interpo...

Using a Multi-Frequency Synthetic Aperture Sonar for Bathymetry

This paper describes the implementation of a bathymetric synthetic aperture sonar and presents imagery from preliminary sea trials of the sonar. The sonar is designed for high resolution seafloor imaging in a shallow water environment. To estimate seafloor topology, the sonar ssytem uses the phase difference between elements of a vertical hydrophone array. Since the interferometric process uses...

Evolving visual sonar: Depth from monocular images

To recover depth from images, the human visual system uses many monocular depth cues, which vision research has only begun to explore. Because a given image can have many possible interpretations, constraints are needed to eliminate ambiguity, and the most powerful constraints are domain specific. As an experiment in the automatic discovery and exploitation of constraints, Genetic Programming w...