Marine Geodesy最新文献_第4页

Estimation of the Sea State Bias Using the Interpolation Method and Applications to Inter-Mission Calibration 用插值法估计海况偏差及其在任务间校准中的应用

IF 1.6 4区地球科学

Marine Geodesy Pub Date : 2023-07-04 DOI: 10.1080/01490419.2023.2229019

Alexa Putnam, S. Desai, R. S. Nerem

引用次数: 1

Estimation of the sea state bias error budget for pulse-limited satellite altimetry 脉冲限制卫星测高的海况偏差误差预算估计

IF 1.6 4区地球科学

Marine Geodesy Pub Date : 2023-06-19 DOI: 10.1080/01490419.2023.2224513

Alexa Putnam, S. Desai, R. S. Nerem

{"title":"Estimation of the sea state bias error budget for pulse-limited satellite altimetry","authors":"Alexa Putnam, S. Desai, R. S. Nerem","doi":"10.1080/01490419.2023.2224513","DOIUrl":"https://doi.org/10.1080/01490419.2023.2224513","url":null,"abstract":"Abstract Using an empirical, non-parametric sea state bias (SSB) modeling method, which was developed as a tool for SSB error analysis (Putnam, Alexa Forthcoming), we provide an error budget for overall SSB error, as well as the contributing sources of this error budget. The error analysis compares methods used to derive SSB models from observed altimeter measurements, collinear differences of measurements from adjacent repeat cycles, and methods using both collinear and crossover differences of measurements. Our error analysis reveals systematic error caused by ionosphere correction uncertainty in SSB models obtained from direct measurements, and wet troposphere correction uncertainty in SSB models generated using difference measurements. Results also expose a correlation to altimeter measurement error, with the backscatter coefficient accounting for over 20% of the SSB evaluation error and SWH accounting for approximately 50-60%. The error analysis presented here suggests SSB errors are lower than the often-used approximation of SSB error as 1% of SWH, except at SWH values less than 2 m where errors are likely larger. We find that increasing the pulse repetition frequency of the altimeter reduces SSB errors. The future for improving empirical, nonparametric SSB estimation primarily depends on improving measured SWH.","PeriodicalId":49884,"journal":{"name":"Marine Geodesy","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48816605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Precise Navigation of USV Based on PPP-RTK/MEMS in the Offshore Environment 基于PPP-RTK/MEMS的海上无人潜航器精确导航

IF 1.6 4区地球科学

Marine Geodesy Pub Date : 2023-06-19 DOI: 10.1080/01490419.2023.2223764

Minzhi Xiang, Hongzhou Chai, Xiao Yin, Zhenqiang Du, Kaidi Jin

{"title":"Precise Navigation of USV Based on PPP-RTK/MEMS in the Offshore Environment","authors":"Minzhi Xiang, Hongzhou Chai, Xiao Yin, Zhenqiang Du, Kaidi Jin","doi":"10.1080/01490419.2023.2223764","DOIUrl":"https://doi.org/10.1080/01490419.2023.2223764","url":null,"abstract":"Abstract High-precision position, velocity and attitude information is the premise for the unmanned surface vehicle (USV) to perform various tasks. The traditional navigation technology of USV is to combine RTK (real-time kinematics) with MEMS (micro-electromechanical system). In order to avoid bi-directional communication of RTK/MEMS, a loosely coupled PPP (precise point positioning)-RTK/MEMS navigation method is proposed in this contribution, where the un-combined PPP-RTK positioning model and advanced time-differenced carrier-phase (TDCP) velocity determination model is adopted. When the reference stations are far away from the user, i.e., more than 55 km, the centimetre-level positioning results can be achieved and especially 99% horizontal error is less than 10 cm. Compared with the TDCP-only centimetre-per-second-level velocity accuracy, the proposed method can increase to accuracy of the order of millimetres per second. In terms of attitude determination accuracy, the roll and pitch are better than 0.1° and yaw is better than 0.5°, showing a similar performance to the nominal accuracy. Therefore, the proposed PPP-RTK/MEMS integration method can be a promising USV navigation solution in the offshore area.","PeriodicalId":49884,"journal":{"name":"Marine Geodesy","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46772472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Low-cost multi-GNSS, single-frequency RTK averaging for marine applications: accurate stationary positioning and vertical tide measurements 用于海洋应用的低成本多gnss，单频RTK平均:精确的静止定位和垂直潮汐测量

IF 1.6 4区地球科学

Marine Geodesy Pub Date : 2023-05-29 DOI: 10.1080/01490419.2023.2208289

Emily J. Tidey, R. Odolinski

{"title":"Low-cost multi-GNSS, single-frequency RTK averaging for marine applications: accurate stationary positioning and vertical tide measurements","authors":"Emily J. Tidey, R. Odolinski","doi":"10.1080/01490419.2023.2208289","DOIUrl":"https://doi.org/10.1080/01490419.2023.2208289","url":null,"abstract":"Abstract The use of Real Time Kinematic (RTK) Global Navigation Satellite System (GNSS) for accurate horizontal and vertical measurements in the marine environment has been considered since the late-1980’s and tested from the 1990’s when GPS and GLONASS were the only operational constellations available and high-cost multi-frequency receiver equipment was required. This paper modernizes the conversation using multi-constellation, low-cost, single-frequency RTK GNSS measurements and proves their value with accurate positioning and tide measurements. Our tests show average stationary horizontal positioning measurements using this equipment are suitable (95% CI) for the most stringent International Hydrographic Organization (IHO) Standard S-44 ‘Exclusive Order’ at base station ranges of up to 27 km. Vertical observations on a moving platform, smoothed using a baseline distance-dependent moving average filter show the equipment and method are comparable with traditional electronic tide gauge observations over the same base station range. All of our measurement results show the potential to improve total uncertainty calculations undertaken by hydrographers, engineers and scientists in the marine realm, while the low-cost equipment raises the possibility that more measurements can be taken, leading to improvements in monitoring, modelling and understanding the marine environment.","PeriodicalId":49884,"journal":{"name":"Marine Geodesy","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46480395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A GNSS-aided DVL calibration method based on quaternion estimation for underwater vehicles 基于四元数估计的gnss辅助水下航行器DVL标定方法

IF 1.6 4区地球科学

Marine Geodesy Pub Date : 2023-05-27 DOI: 10.1080/01490419.2023.2213838

Kaidi Jin, Hongzhou Chai, Chuhan Su, Minzhi Xiang, Mingchen Shi

引用次数: 0

Multispectral Satellite-Derived Bathymetry Based on Sparse Prior Measured Data 基于稀疏先验测量数据的多光谱卫星测深

IF 1.6 4区地球科学

Marine Geodesy Pub Date : 2023-05-23 DOI: 10.1080/01490419.2023.2213840

Yanhong Wang, Yilan Chen, Yikai Feng, Zhipeng Dong, Xiaoyu Liu

引用次数: 1

Distinguishing Ulva prolifera and Sargassum horneri by using multi-feature-based ResUnet algorithm 基于多特征的ResUnet算法区分浒苔和马尾藻

IF 1.6 4区地球科学

Marine Geodesy Pub Date : 2023-05-03 DOI: 10.1080/01490419.2023.2197265

Jinyu Li, Shengjia Zhang, Chao Zhang, Hong-chun Zhu

{"title":"Distinguishing Ulva prolifera and Sargassum horneri by using multi-feature-based ResUnet algorithm","authors":"Jinyu Li, Shengjia Zhang, Chao Zhang, Hong-chun Zhu","doi":"10.1080/01490419.2023.2197265","DOIUrl":"https://doi.org/10.1080/01490419.2023.2197265","url":null,"abstract":"Abstract In recent years, two types of macroalgae, namely, Ulva prolifera and Sargassum horneri, have appeared occasionally together in the Yellow Sea and the East China Sea. Remote sensing enables timely and cost-effective observation of macroalgae across large areas. In the available studies, the recognition and classification of the two macroalgae are primarily based on spectral difference analysis. In this study, the spectral features, indices and textural feature parameters of the macroalgae targets were extracted and a preliminary multi-feature dataset was constructed based on Sentinel-2 images. Feature selection was performed using SHAP-based importance analysis and Bhattacharyya distance. From this, a multi-feature dataset was created and used as an input to a deep semantic segmentation network of improved ResUnet. The experiments of intelligent recognition and classification of U. prolifera and S. horneri were carried out using the proposed multi-feature-based ResUnet algorithm, with specific F1-scores of 96.7% and 96.8%, respectively. The proposed multi-feature-based ResUnet algorithm can obtain efficient and high-accuracy results for the recognition and classification of marine floating macroalgae. It achieves accurate remote sensing monitoring of the two types of marine floating macroalgae and has significant theoretical research significance and practical application value.","PeriodicalId":49884,"journal":{"name":"Marine Geodesy","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43063267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Assessment of beach morphological changes in the east coast of India during cyclone Phethai, through field data and numerical modeling 通过现场数据和数值模拟评估“Phethai”气旋期间印度东海岸海滩形态变化

IF 1.6 4区地球科学

Marine Geodesy Pub Date : 2023-04-27 DOI: 10.1080/01490419.2023.2200043

V. Noujas, R. S. Kankara, B. Rajan

{"title":"Assessment of beach morphological changes in the east coast of India during cyclone Phethai, through field data and numerical modeling","authors":"V. Noujas, R. S. Kankara, B. Rajan","doi":"10.1080/01490419.2023.2200043","DOIUrl":"https://doi.org/10.1080/01490419.2023.2200043","url":null,"abstract":"Abstract Episodic extreme waves caused by cyclones can have catastrophic consequences for coastal zones, including drastic beach morphology changes. The present study analyzed the beach morphological changes from Kakinada to Konapapapeta on the southeast coast of India before, during, and after the tropical cyclone Phethai using field survey and numerical modeling. Beach profiles were collected using Trimble RTK GPS and shoreline tracking was performed with handheld GPS. Numerical modeling was carried out using MIKE software to estimate the sediment transport rate before, during, and after the cyclone. Although the intensity of the cyclone reduced to a deep depression before landfall, several morphological changes were observed. Erosion was higher in the northern sector, where the beach width was less, and prominent scarps were seen throughout this region after the cyclone. The inundation varied from 40 to 120 m during the cyclone due to a storm surge of 0.5 to 1 m. During the cyclone, significant wave heights reached up to 4 m. The gross sediment transport rate is 3 to 13 times greater during the cyclone period than during the non-cyclone period. The maximum gross sediment transport rate during the Phethai cyclone was 1040 m3/day. Sediment transport was estimated for the same site for the non-cyclone year 2019, and the gross transport rate was 26,174 m3. As it is projected that extreme events are likely to increase due to climate change, output from this type of study is vital to environmental managers to assess erosion and develop long-term mitigation plans.","PeriodicalId":49884,"journal":{"name":"Marine Geodesy","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48281847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Probabilities of acquiring cloud-free and low-tide Landsat observations for mapping saltmarsh over south-eastern Bangladesh from 1980 to 2019 1980年至2019年孟加拉国东南部盐沼测绘中获取无云和低潮Landsat观测数据的概率

IF 1.6 4区地球科学

Marine Geodesy Pub Date : 2023-04-10 DOI: 10.1080/01490419.2023.2200212

Sheikh Mohammed Rabiul Alam, M. S. Hossain

{"title":"Probabilities of acquiring cloud-free and low-tide Landsat observations for mapping saltmarsh over south-eastern Bangladesh from 1980 to 2019","authors":"Sheikh Mohammed Rabiul Alam, M. S. Hossain","doi":"10.1080/01490419.2023.2200212","DOIUrl":"https://doi.org/10.1080/01490419.2023.2200212","url":null,"abstract":"Abstract As is well-documented, cloud cover (CC) obscures the target object and water depth and turbidity impede optical remote sensing (RS). Therefore, Landsat imagery acquired under cloud-free (CFI) and low-tide (LTI) conditions are considered ‘quality’ observations when mapping tidal wetlands such as saltmarsh. Although it is essential to estimate probabilities of acquiring at least one CFI and LTI, previous studies rarely addressed in RS of saltmarsh land cover (SLC). In order to evaluate the probabilities of acquiring at least one CFI and LTI in a year, a month, a season, a pair of seasons, or a certain time interval within a year over south-eastern Bangladesh, all images acquired between 1988 and 2019 were examined. The results indicate that SLC applications are generally affected by CC and tide heights; an average yearly CF probability of 16% can be acquired under LT conditions. Seasonal variations in CFI are apparent and there is a significant shortage of clear observation during the monsoon. The higher number of CFI may not guarantee a higher probability of LTI due to tide dynamics. The availability of both CFI and LTI can be remarkably improved if the present 16-day interval time of Landsat’s acquisition is increased.","PeriodicalId":49884,"journal":{"name":"Marine Geodesy","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43915105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Book Review: High-resolution Seafloor Survey and Applications by Ziyin Wu, Fanlin Yang, Yong Tang, et al. 书评:高分辨率海底测量与应用吴子银，杨凡林，唐勇等。

4区地球科学

Marine Geodesy Pub Date : 2023-04-08 DOI: 10.1080/01490419.2023.2185842

Gang Qiao

引用次数: 3