Grayscale Seismic-Reflection Images in PNG Format from Western Rhode Island Sound (1980)

During 1980, a Uniboom seismic-reflection survey was conducted by the U.S. Geological Survey (USGS) in western Rhode Island Sound aboard the Research Vessel NeechoThe cruise consisted of 2 legs and had a total of 8 survey days. Data from this survey were recorded in analog form and archived at the USGS. As a result of recent interest in the geology of Rhode Island Sound and in an effort to make the data more readily accessible while preserving the original paper records, the seismic data from this cruise were scanned and converted to TIFF and PNG images and SEG-Y data files. In order to scan the lines, some of the paper records were cut and scanned in sections. These sections are labeled with lower-case letters and differ from the names of lines in the logbook. Some SEG-Y files were further divided in order for each file to contain continuous data collected at the same ship speed; these line segments have been labeled _1, _2, or _3 after the section label. Navigation data were converted from LORAN-C time delays to latitudes and longitudes that are available in ESRI shapefile format and as eastings and northings in space-delimited text format.

1980年，美国地质调查局（U.S. Geological Survey, 简称USGS）搭乘“尼乔”号科研船（Research Vessel Neecho）在罗得岛湾西部开展了Uniboom型地震反射勘探作业。本次勘探航次分为2个航段，总勘测时长为8个勘测日。本次勘探获取的数据以模拟格式记录，并存档于USGS。鉴于近年来学界对罗得岛湾地质研究的关注度不断提升，同时为了在保留原始纸质记录的前提下提升数据的可获取性，本次勘探的地震数据已被扫描，并转换为TIFF、PNG图像格式以及SEG-Y数据文件。为完成测线扫描，部分纸质记录被裁切为若干分段进行扫描。这些分段以小写字母标识，与航次日志中的测线名称存在差异。部分SEG-Y文件还被进一步拆分，以确保单个文件仅包含同一航速下采集的连续数据；这类分段在分段标识后附加了_1、_2或_3进行标注。导航数据已从LORAN-C（罗兰-C）时间延迟参数转换为经纬度坐标，相关数据以ESRI形状文件（ESRI shapefile）格式提供，同时也以空格分隔的文本格式发布东向和北向平面坐标。