Results 21 to 30 of about 42,717 (194)

Technical Design and Data Analysis of Autonomous Underwater Vehicle-Based Side-Scan Sonar Operations

Journal of Marine Science and Engineering, 2023
In response to the absence of standardized work practices, work safety measures, efficient work procedures, and suitable line planning methods for exploring seabed topography using autonomous underwater vehicles (AUVs) equipped with side-scan sonar ...
Xinyang Zhao, Shaohua Jin, Gang Bian, Yang Cui, Junsen Wang, Yulin Tang, Chao Jiang   +6 more
doaj   +1 more source

A Novel Method for Inverting Deep-Sea Sound-Speed Profiles Based on Hybrid Data Fusion Combined with Surface Sound Speed

Journal of Marine Science and Engineering
Sound speed profiles (SSPs) must be detected simultaneously to perform a multibeam depth survey. Accurate real-time sound speed profile (SSP) acquisition remains a critical challenge in deep-sea multibeam bathymetry due to the limitations regarding ...
Qiang Yuan, Weiming Xu, Shaohua Jin, Xiaohan Yu, Xiaodong Ma, Tong Sun   +5 more
doaj   +1 more source

S³DR-Det: A Rotating Target Detection Model for High Aspect Ratio Shipwreck Targets in Side-Scan Sonar Images

Remote Sensing
The characteristics of multi-directional rotation and high aspect ratio of targets such as shipwrecks lead to low detection accuracy and difficulty localizing existing detection models for this target type.
Quanhong Ma, Shaohua Jin, Gang Bian, Yang Cui, Guoqing Liu, Yihan Wang   +5 more
doaj   +1 more source

A Point Cloud Simplification Algorithm Based on Weighted Feature Indexes for 3D Scanning Sensors

Sensors, 2022
Conventional point cloud simplification algorithms have problems including nonuniform simplification, a deficient reflection of point cloud characteristics, unreasonable weight distribution, and high computational complexity.
Zhiyuan Shi, Weiming Xu, Hao Meng
doaj   +1 more source

A Method for Sound Speed Profile Prediction Based on CNN-BiLSTM-Attention Network

Journal of Marine Science and Engineering
In response to the current challenges in efficiently acquiring sound speed profiles and ensuring their representativeness, considering the need to fully leverage historical sound speed profiles while accounting for their spatiotemporal variability, we ...
Zhang Wei, Jin Shaohua, Bian Gang, Cui Yang, Peng Chengyang, Xia Haixing   +5 more
doaj   +1 more source

A Curvelet-Transform-Based Image Fusion Method Incorporating Side-Scan Sonar Image Features

Journal of Marine Science and Engineering, 2023
Current methods of fusing side-scan sonar images fail to tackle the issues of shadow removal, preservation of information from adjacent strip images, and maintenance of image clarity and contrast. To address these deficiencies, a novel curvelet-transform-
Xinyang Zhao, Shaohua Jin, Gang Bian, Yang Cui, Junsen Wang, Bo Zhou   +5 more
doaj   +1 more source

Prospects and Constraints of Lowest Astronomical Tide (LAT) as Determination of Sea Boundaries in Indonesia

Egyptian Journal of Aquatic Research, 2023
The determination of the maritime boundary is related to the selection of the tidal datum used in relation to the zero-depth reference. This research was conducted to determine the impact of the zero-depth reference that has been used, the Mean Low Water
Eka Djunarsjah, Candida A.D.S. Nusantara, Andika P. Putra, Riko A. Wijaya, Sehat S. Sianturi, Nofal M.K. Anantri, Difa Kusumadewi, Miga M. Julian   +7 more
doaj   +1 more source

Sunshine Duration in Brazil From Meteosat (1983–2020): Climatology, Variability and Long‐Term Trends

International Journal of Climatology, EarlyView.
Using nearly four decades of Meteosat satellite data (1983–2020), this study presents a country‐wide climatology of sunshine duration (SDU) in Brazil. The results reveal marked regional contrasts, dominant modes of variability, and significant long‐term trends, providing new information on the most relevant meteorological systems that influence SDU and
Maria Lívia Lins Mattos Gava, Simone Marilene Sievert da Costa, Íris Paraguay Silva   +2 more
wiley   +1 more source

Ocean acidification at the crossroads I: Harmonizing unpurified and purified meta‐cresol purple spectrophotometric pHT measurements based on absorbance data

Limnology and Oceanography: Methods, EarlyView.
Abstract Consistent monitoring of seawater spectrophotometric pH on the total hydrogen ion scale (pHT) has been questioned by an evolving method, with changes in parameterization and the purity of the meta‐cresol purple (mCP). Using real seawater samples, we demonstrate that spectrophotometric pHT measurements obtained with unpurified (UNPUR) and ...
Marta Álvarez, Maribel I. García‐Ibáñez, Rubén Acerbi, Rocío Santiago‐Domenech, Elisa F. Guallart, Noelia M. Fajar, Lisandro Arbilla   +6 more
wiley   +1 more source

Sample Augmentation Method for Side-Scan Sonar Underwater Target Images Based on CBL-sinGAN

Journal of Marine Science and Engineering
The scarcity and difficulty in acquiring Side-scan sonar target images limit the application of deep learning algorithms in Side-scan sonar target detection.
Chengyang Peng, Shaohua Jin, Gang Bian, Yang Cui, Meina Wang   +4 more
doaj   +1 more source