Raw Geoswath bathymetry and sidescan data (RFF format) in Eastern Long Island Sound (2018)

This data set was acquired with a 250 kHz Kongsberg Geoswath Phase Measuring Bathymetry Sonar (PMBS) system equipped mounted in the moon pool of R/V Lowell Weicker. Horizontal accuracy was provided by DGPS augmented by RTK corrections from The Advanced Continuous Operation Reference Network (ACORN). This is a Connecticut statewide system of base stations that provides real-time corrections for GPS equipment operated by the University of Connecticut through a partnership with CTDOT (http://acorn.uconn.edu). Tides were corrected to MLLW based on tide gauge data from NOAA Tide Station at New London, Connecticut (Station ID: 8461490). Sound velocity profiles (SVP) were conducted every three hours to acquire sound speed data using UConn's Valeport SVP system. The system recorded bathymetry and sidescan sonar data along with heave, pitch and roll data from a Seatex MRU-5 mounted on the Geoswath transducer. Positional information for all equipment (GPS, transducer, MRU) offsets and latencies can be found in the CARIS vessel file included with the raw data. Line spacing was set at 25 meters for the majority of the survey area with a 30 meter spacing adopted in deeper areas (information provided in the daily Survey Logs). Data acquisition was performed using the Geoswath+ acquisition software and saved as .rff files for subsequent post-processing. Each survey segment zipped file contains raw and auxiliary (sound velocity profiles, tides) data. The data were collected and assembled as part of the "The Long Island Sound Seafloor Mapping Initiative Phase II – Eastern Long Island Sound" project conducted by the Long Island Sound Mapping and Research Collaborative (LISMaRC, Principal Investigator: Ivar G. Babb). Funding provided by the Long Island Sound Seafloor Mapping Fund administered cooperatively by the EPA Long Island Sound Study and the Connecticut Department of Energy and Environmental Protection (DEEP).

本数据集由搭载于R/V洛厄尔·韦克号（R/V Lowell Weicker）研究船月池内的250 kHz康士伯Geoswath相位测量测深声呐（PMBS）系统采集获取。水平定位精度由差分GPS（DGPS）结合高级连续运行参考站网（ACORN）提供的RTK校正保障，该站网为康涅狄格大学与康涅狄格州交通局（CTDOT）合作运营的GPS设备提供实时校正服务，相关站点信息详见http://acorn.uconn.edu。潮位校正基于美国康涅狄格州新伦敦市美国国家海洋和大气管理局（NOAA）潮位站（站号：8461490）的观测数据，校正至平均低低潮面（MLLW）。每3小时采用康涅狄格大学的Valeport声速剖面（SVP）系统采集声速数据，获取声速剖面。该系统同步记录测深数据、侧扫声呐数据，以及搭载于Geoswath换能器上的Seatex MRU-5运动参考单元采集的升沉、纵倾与横摇数据。所有设备（GPS、换能器、MRU）的位置偏移与延迟信息，可在原始数据附带的CARIS船载文件中查阅。大部分测量区域的测线间距设置为25米，深水区域采用30米间距，相关细节可查阅每日测量日志。数据采集采用Geoswath+采集软件完成，存储为.rff格式文件以供后续后处理。每个测量航段的压缩包均包含原始数据与辅助数据（声速剖面、潮位数据）。本数据集作为“长岛海峡海底测绘计划第二阶段——东长岛海峡”项目的一部分采集整理，该项目由长岛海峡测绘与研究协作组（LISMaRC）实施，首席研究员为Ivar G. Babb。本项目由美国环境保护署（EPA）长岛海峡研究项目与康涅狄格州能源与环境保护部（DEEP）联合管理的长岛海峡海底测绘基金提供资助。