Results 31 to 40 of about 23,689 (244)

Optimal Automatic Wide-Area Discrimination of Fish Shoals from Seafloor Geology with Multi-Spectral Ocean Acoustic Waveguide Remote Sensing in the Gulf of Maine

Remote Sensing, 2023
Ocean Acoustic Waveguide Remote Sensing (OAWRS) enables fish population density distributions to be instantaneously quantified and continuously monitored over wide areas.
Kaklamanis Eleftherios, Purnima Ratilal, Nicholas C. Makris   +2 more
doaj   +1 more source

Efficient Approach for OS-CFAR 2D Technique Using Distributive Histograms and Breakdown Point Optimal Concept applied to Acoustic Images [PDF]

, 2019
In this work, a new approach to improve the algorithmic efficiency of the Order Statistic-Constant False Alarm Rate (OS-CFAR) applied in two dimensions (2D) is presented.
Acosta, Gerardo Gabriel, Menna, Bruno Victorio, Torcida, Sebastián, Villar, Sebastian Aldo   +3 more
core   +2 more sources

Oceanographic drivers of deep-sea coral species distribution and community assembly on seamounts, islands, atolls, and reefs within the Phoenix Islands Protected Area [PDF]

, 2020
© The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Auscavitch, S. R., Deere, M. C., Keller, A. G., Rotjan, R. D., Shank, T. M., & Cordes, E.
Auscavitch, Steven R., Cordes, Erik E., Deere, Mary C., Keller, Abigail G., Rotjan, Randi, Shank, Timothy M.   +5 more
core   +2 more sources

Seafloor Sediment Classification Using Small-Sample Multi-Beam Data Based on Convolutional Neural Networks

Journal of Marine Science and Engineering
Accurate, rapid, and automatic seafloor sediment classification represents a crucial challenge in marine sediment research. To address this, our study proposes a seafloor sediment classification method integrating convolutional neural networks (CNNs ...
Haibo Ma, Xianghua Lai, Taojun Hu, Xiaoming Fu, Xingwei Zhang, Sheng Song   +5 more
doaj   +1 more source

Assessing the Repeatability of Automated Seafloor Classification Algorithms, with Application in Marine Protected Area Monitoring

Remote Sensing, 2020
The number and areal extent of marine protected areas worldwide is rapidly increasing as a result of numerous national targets that aim to see up to 30% of their waters protected by 2030.
America Zelada Leon, Veerle A.I. Huvenne, Noëlie M.A. Benoist, Matthew Ferguson, Brian J. Bett, Russell B. Wynn   +5 more
doaj   +1 more source

Measurement of Seafloor Acoustic Backscatter Angular Dependence at 150 kHz Using a Multibeam Echosounder

Remote Sensing, 2021
Acoustic seafloor measurements with multibeam echosounders (MBESs) are currently often used for submarine habitat mapping, but the MBESs are usually not acoustically calibrated for backscattering strength (BBS) and cannot be used to infer absolute ...
Karolina Trzcinska, Jaroslaw Tegowski, Pawel Pocwiardowski, Lukasz Janowski, Jakub Zdroik, Aleksandra Kruss, Maria Rucinska, Zbigniew Lubniewski, Jens Schneider von Deimling   +8 more
doaj   +1 more source

Classification of Cylindrical Targets Buried in Seafloor Sediments

2007 IEEE Region 5 Technical Conference, 2007
This paper presents the development and evaluation of a time-frequency processing technique for detection and classification of buried cylindrical targets from chirp-based parametric sonar data. The software is designed to discriminate between cylindrical targets - such as cables - of different diameters, which need to be identified as different from ...
Edit J. Kaminsky, Madalina Barbu
openaire   +2 more sources

Toward the development of smart capabilities for understanding seafloor stretching morphology and biogeographic patterns via DenseNet from high-resolution multibeam bathymetric surveys for underwater vehicles

Frontiers in Marine Science, 2023
The increasing use of underwater vehicles facilitates deep-sea exploration at a wide range of depths and spatial scales. In this paper, we make an initial attempt to develop online computing strategies to identify seafloor categories and predict ...
Rui Nian, Shasha Liu, Zongcan Lu, Xiaoyu Li, Shidong Ren, Yuqi Qian, Qiuying Li, Guotong He, Kexin Shi, Guoyao Zhang, Lina Zang, Luyao Li, Bo He, Tianhong Yan, Xishuang Li   +14 more
doaj   +1 more source

Patterns of spinal motion, kinematic spaces and the land‐to‐sea transition in carnivorans

The Anatomical Record, EarlyView.
Using 3D reconstructions, we quantify intervertebral joint mobility to investigate how cervical, thoracic, and lumbar vertebral regions evolved distinct kinematic roles in pinnipeds. The findings reveal lineage‐specific adaptations for swimming and highlight the functional significance of vertebral joint flexibility in ecological transitions.
Juan Miguel Esteban, Alberto Martín‐Serra, Alejandro Pérez‐Ramos, Borja Figueirido   +3 more
wiley   +1 more source

A New Radiometric Correction Method for Side-Scan Sonar Images in Consideration of Seabed Sediment Variation

Remote Sensing, 2017
Affected by the residual of time varying gain, beam patterns, angular responses, and sonar altitude variations, radiometric distortion degrades the quality of side-scan sonar images and seriously affects the application of these images. However, existing
Jianhu Zhao, Jun Yan, Hongmei Zhang, Junxia Meng   +3 more
doaj   +1 more source