Abstract
This paper proposes a method of creating a multiresolution depth grid containing bathymetric data describing a stretch of sea floor. The included literature review presents current solutions in the area of the creation of digital terrain models (DTMs) focusing on methods employing regular grids, with a discussion on the strong and weak points of such an approach. As a basis for the investigations, some important recommendations from the International Hydrographic Organization are provided and are related to the accuracy of created models. The authors propose a novel method of storing DTM data, involving multiresolution depth grids. The paper presents the characteristics of this method, numerical algorithms of a conversion between a regular grid and the multiresolution one, and experiments on typical seafloor surfaces. The results are discussed, focusing on the data reduction rate and the variable resolution of the grid structure. The proposed method can be applied in Geographical Information Systems, especially for the purposes of solving sea survey problems.
Highlights
As the head moves forward, these profiles sweep out a ribbon-shaped surface of depth measurement, which is the so-called “swath.” Current swath sounding systems utilize two different technologies to achieve bathymetry measurements across a swath of a sea floor: (1) beam forming (MBESs) and (2) interferometric or phase discrimination
We investigated near-lossless compression methods based on discrete cosine transform (DCT) [23], wavelets [24] and principal component analysis (PCA) [25,26]
We present a novel application of a multiresolution depth grid data structure applied to seafloor shape representation with a required, predefined reconstruction accuracy
Summary
Multibeam echosounders (MBESs) are widely used in marine environment surveillance, detailed bathymetry measurement and seafloor mapping, underwater object detection and imaging, or submerged infrastructure inspection Current trends in their development involve the introduction of innovative transducer materials and the application of sophisticated processing techniques, including focusing algorithms that dynamically compensate for the curvature of the wavefront in the nearfield and allow for narrower beam widths (higher lateral resolution) at close ranges. As the head moves forward, these profiles sweep out a ribbon-shaped surface of depth measurement, which is the so-called “swath.” Current swath sounding systems utilize two different technologies to achieve bathymetry measurements across a swath of a sea floor: (1) beam forming (MBESs) and (2) interferometric or phase discrimination (sonars) Both techniques have their advantages and disadvantages, but they lead to the same end results
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
