Results 31 to 40 of about 3,433 (166)

Hydrography of the Andes [PDF]

The Geographical Journal, 1905
n ...
openaire   +2 more sources

An Algorithm for Sound Velocity Error Correction Using GA-SVR Considering the Distortion Characteristics of Seabed Topography Measured by Multibeam Sonar Mounted on Autonomous Underwater Vehicle

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Aiming to address the problem that autonomous underwater vehicle (AUV) with multibeam echo sounder system (MBES) for underwater topographic survey cannot autonomously obtain the sound velocity of the acoustic path to correct bathymetric data, this ...
Xiaohan Yu, Junsen Wang, Yang Cui, Shaohua Jin, Gang Bian, Na Chen   +5 more
doaj   +1 more source

Multi-Scale Marine Object Detection in Side-Scan Sonar Images Based on BES-YOLO

Sensors
Aiming at the problem of low accuracy of multi-scale seafloor target detection in side-scan sonar images with high noise and complex background texture, a model for multi-scale target detection using the BES-YOLO network is proposed.
Quanhong Ma, Shaohua Jin, Gang Bian, Yang Cui   +3 more
doaj   +1 more source

Observation of Statistical Characteristics and Vertical Structures of Surface Warm Cyclonic Eddies and Cold Anticyclonic Eddies in the North Pacific Subtropical Countercurrent Region

Journal of Marine Science and Engineering
Conventional wisdom about mesoscale eddies is that cyclonic (anticyclonic) eddies are commonly associated with cold(warm) surface cores. Nevertheless, plenties of surface warm cyclonic eddies (WCEs) and cold anticyclonic eddies (CAEs) in the North ...
Yaowei Ma, Qinghong Li, Xiangjun Yu, Song Li, Xingyu Zhou   +4 more
doaj   +1 more source

A Crossover Adjustment Method Considering the Beam Incident Angle for a Multibeam Bathymetric Survey Based on USV Swarms

Journal of Marine Science and Engineering
Multibeam echosounder systems (MBESs) are widely used in unmanned surface vehicle swarms (USVs) to perform various marine bathymetry surveys because of their excellent performance. To address the challenges of systematic error superposition and edge beam
Qiang Yuan, Weiming Xu, Shaohua Jin, Tong Sun   +3 more
doaj   +1 more source

A Novel Cooperative Localization Algorithm Based on LSTM and Factor Graph for AUV Swarms

Journal of Marine Science and Engineering
To address localization error accumulation in autonomous underwater vehicle (AUV) swarms due to underwater acoustic communication interruptions, this paper proposes a cooperative localization method that integrates Long Short-Term Memory (LSTM ...
Tong Sun, Weiming Xu, Yisong Deng, Jinyang Luo   +3 more
doaj   +1 more source

A High-Precision Method for Evaluating the Similarity of Maritime Vessel Trajectories

Journal of Marine Science and Engineering
This study investigates the demand for high-precision trajectory similarity assessment in intelligent maritime navigation. This is done by analyzing discrepancies between GPS-derived trajectories and actual vessel paths, while identifying critical ...
Ran Ji, Mengkai Ma, Jian Dong, Sen Wang
doaj   +1 more source

Method for Delineating the Formula Limit of the Continental Shelf under the Maximum Area Principle Constraint

Journal of Marine Science and Engineering
In current practices of determining continental shelf area, the measured sediment thickness data do not effectively reflect the distribution of sediments across the area due to its dispersed nature.
Tian Xie, Jian Dong, Lulu Tang, Mengkai Ma, Dong Wang   +4 more
doaj   +1 more source

An integrated novel approach to the environmental health assessment of Bangladesh's coastal ecosystems

Environmental Challenges
The coastal expanse of Bangladesh, situated along the Bay of Bengal, is a susceptible and low-lying area grappling with multiple environmental challenges. Various physicochemical parameters were employed in the assessment of water quality. The CCME Water
Sheikh Fahim Faysal Sowrav, S. M. Mustafizur Rahman, Kashafad Bin Hafiz, Md. Alamgir Hossain   +3 more
doaj   +1 more source

Multiscale Bayes Adaptive Threshold Wavelet Transform Geomagnetic Basemap Denoising Taking Residual Constraints into Account

Sensors
To achieve high-precision geomagnetic matching navigation, a reliable geomagnetic anomaly basemap is essential. However, the accuracy of the geomagnetic anomaly basemap is often compromised by noise data that are inherent in the process of data ...
Pan Xiong, Gang Bian, Qiang Liu, Shaohua Jin, Xiaodong Yin   +4 more
doaj   +1 more source