The global marine gravity anomalies are primarily recovered from geoid gradients in the along-track directions obtained through satellite altimetry. However, accuracy of model is significantly constrained by sparse cross-track directions. To overcome scarcity gradients, we employ a mean sea surface to calculate multiple directions, thereby recovering anomalies. A anomaly with 1-arcmin grid was determined an optimized model. this assessed shipborne and released models. By combination meridian...

A massive floating green macroalgae bloom (GMB) has occurred for several years consecutively in the Yellow Sea since 2007. In view of rapid growth macroalgae, early detection its patches at first appearance by satellite imagery is importance, and central issue selection appropriate data. As a step towards this goal, based on quasi-synchronous images HJ-1A/B (China Small Satellite Constellation Environment Disaster Monitoring Forecasting) charge-coupled devices (CCDs), Environmental (ENVISAT)...

Abstract. Seafloor topography, as a fundamental marine spatial geographic information, plays vital role in observation and science research. With the growing demand for high-precision bathymetric models, multi-layer perceptron (MLP) neural network is used to integrate multi-source geodetic data this paper. A new model of global ocean, spanning 180° E–180° W 80° S–80° N, known Shandong University Science Technology 2023 Bathymetric Chart Oceans (SDUST2023BCO), has been constructed, with grid...

This study validated wind speed (WS) and significant wave height (SWH) retrievals from the Sentinel-3A/3B Jason-3 altimeters for period of data beginning 31 October 2019 (to 18 September Jason-3) using moored buoy satellite Meteorological Operational Satellite Program (MetOp-A/B) Advanced Scatterometer (ASCAT) data. The spatial temporal scales collocated were 25 km 30 min, respectively. statistical metrics root mean square error (RMSE), bias, correlation coefficient (R), scatter index (SI)...

Abstract. The Philippine Sea, located at the edge of northwestern Pacific Ocean, possesses complex seabed topography. Developing a high-precision bathymetric model for this region is paramount importance, as it provides fundamental geoinformation essential Earth observation and marine scientific research, including plate motion, ocean circulation, hydrological characteristics. gravity–geologic method (GGM), based on gravity anomalies, serves an effective prediction technique. To further...

Scientometric reviews, facilitated by computational and visual analytical approaches, allow researchers to gain a thorough understanding of research trends areas concentration from large number publications. With the fast development satellite altimetry, which has been effectively applied wide range topics, it is timely summarize scientific achievements previous 50 years identify future in this field. A comprehensive overview altimetry was presented using total 8541 publications Web Science...

Abstract. Seafloor topography, as a fundamental marine spatial geographic information, plays vital role in observation and science research. With the growing demand for high-precision bathymetric models, Multi-layer Perceptron (MLP) neural network is used to integrate multi-source geodetic data this paper. A new model of global ocean, spanning 0°–360° E 80° S–80° N, has been constructed, known Shandong University Science Technology 2023 Bathymetric Chart Oceans (SDUST2023BCO), with grid size...

Objective: To explore the application of low-energy image in dual-energy spectral CT (DEsCT) combined with deep learning reconstruction (DLIR) to improve inferior vena cava imaging. Materials and Methods: Thirty patients syndrome underwent contrast-enhanced upper abdominal routine dose, 40, 50, 60, 70, 80 keV images delayed phase were first reconstructed ASiR-V40% algorithm. Image quality was evaluated both quantitatively [CT value, SD, signal-to-noise ratio (SNR), contrast-to-noise (CNR)...

The deployment of the HY-2B/2C/2D satellite constellation marks a significant advancement in China’s marine dynamic environmental program, forming robust three-satellite network. All satellites are equipped with “HY2_Receiver”, an indigenous technological achievement. Precise orbit determination using this receiver is critical for monitoring oceanic parameters such as sea surface wind fields and heights. This study presents detailed analysis comparison GPS data quality from satellites,...

Abstract. Judging by the early release of NSOAS22 model, there were some known issues, such as boundary connection problems in blockwise solutions and a relatively high noise level. By solving these problems, new global marine gravity NSOAS24, is derived based on sea surface slopes (SSSs) from multi-satellite altimetry missions. Firstly, SSSs along-track deflections vertical (DOVs) are obtained retracking, resampling, screening, differentiating, filtering procedures basis altimeter waveforms...

Abstract Satellite altimetry has been the major data source for marine geoid determination·and gravity recovery in recent decades. In general, altimetry‐derived and anomaly models are typically released with a 1' × gridding interval. However, their actual spatial resolution is far lower than nominal ∼2 km level. Therefore, analyzing capability from satellite observations crucial studies. The Surface Water Ocean Topography (SWOT) Mission newly launched using advanced radar technology to make...

Abstract Hai Yang-2 ( HY-2 ) satellite altimeter measurements of significant wave height are analyzed over the period from 1 October 2011 to 6 December 2014. They calibrated and validated against in situ buoys other concurrently operating altimeters: Jason-2 , CryoSat-2 Satellite with Argos ALtiKa SARAL ). In general, agree well buoy measurements, a bias −0.22 m root-mean-square error (RMSE) 0.30 m. When reduced major axis (RMA) regression procedure was applied entire period, RMSE by 33% 0.2...

To evaluate the image quality improvement and noise reduction in routine dose, non-enhanced chest CT imaging by using a new generation adaptive statistical iterative reconstruction (ASIR-V) comparison with ASIR algorithm.30 patients who underwent GE Discovery CT750HU (GE Healthcare, Waukesha, WI) were included. The scan parameters included tube voltage of 120 kVp, automatic current modulation to obtain index 14HU, rotation speed 0.6 s, pitch 1.375:1 slice thickness 5 mm. After scanning, all...

Objective: To compare image quality of two adaptive statistical iterative reconstruction (ASiR and ASiR-V) algorithms using objective subjective metrics for routine liver CT, with the conventional filtered back projection (FBP) reconstructions as reference standards. Methods: This institutional review board-approved study included 52 patients clinically suspected hepatic metastases. Patients were divided equally into ASiR ASiR-V groups same scan parameters. Images reconstructed from 0 to...

HY2B is now the latest altimetry mission that provides global nadir significant wave height (SWH) and sea surface wind speed. The validation calibration of are carried out against National Data Buoy Center (NDBC) buoy observations from April 2019 to 2020. In general, altimeter measurements agree well with observation, scatter index 9.4% for SWH, 15.1% However, we observed a bias 0.14 m SWH −0.42 m/s A deep learning technique novelly applied Deep neural network (DNN) built trained correct...

The HY-2B satellite was successfully launched on 25 October 2018. One of the main payloads a radar altimeter. In present study, quality along-track sea surface heights (SSH), significant wave (SWH), and wind speeds (SSWS) were assessed, including their precision accuracy. order to achieve this goal, mono-mission metrics analyzed compared with those Jason-2 Jason-3 over same periods time. results both direct comparison cross methods presented in study. indicated that satellite’s geophysical...

In this study, an Attention U-net network was proposed to reconstruct the subsurface temperature (ST) field with high temporal and spatial resolution in South China Sea (SCS) from sea surface parameters observed by satellites. addition temperature, level anomaly wind field, stress curl, which influences three-dimensional structure of through induced Ekman pumping transport, also input into model. The 5-day average vertical profiles 0.5° Simple Ocean Data Assimilation (SODA) reanalysis...

Over the past 60 years, China has made fruitful achievements in field of ocean microwave remote sensing satellite technology. A long-term plan now been formulated for development Chinese satellites, as well construction a constellation dynamic environmental and surveillance satellites. These will gradually form China’s monitoring network from space, thereby playing important roles future resource monitoring, marine disaster prevention reduction, global climate change. In this review...