d179eg.m77t and d179eg.h77t: MGD77T data and header files for single-beam bathymetry data for field activity D-1-79-EG in the Eastern Gulf of Alaska from 05/24/1979 to 06/01/1979

Single-beam bathymetry data along with SINS navigation data was collected as part of the U.S. Geological Survey cruise D-1-79-EG. The cruise was conducted in the Eastern Gulf of Alaska from May 24 to June 1, 1979. The chief scientists were Bruce Molnia from the USGS Coastal and Marine Geology office in Menlo Park, CA and Mark Wheeler. The purpose of this cruise was to collect sediment samples and cores for a microfossil study. The geophysical source was a 3.5 kilohertz (kHz) bathymetry system. These data are reformatted from space-delimited ASCII text files located in the Coastal and Marine Geology Program (CMGP) InfoBank field activity catalog at http://walrus.wr.usgs.gov/infobank/d/d179eg/html/d-1-79-eg.meta.html into MGD77T format provided by the NOAA's National Geophysical Data Center(NGDC). The MGD77T format includes a header (documentation) file (.h77t) and a data file (.m77t). More information regarding this format can be found in the publication listed in the Cross_reference section of this metadata file.本数据集包含美国地质调查局（U.S. Geological Survey, USGS）D-1-79-EG航次采集的单波束测深数据（single-beam bathymetry data）与船载惯性导航系统（Shipborne Inertial Navigation System, SINS）导航数据。该航次于1979年5月24日至6月1日在阿拉斯加湾东部海域开展，本次航次的首席科学家为来自加利福尼亚州门洛帕克市USGS海岸与海洋地质办公室的布鲁斯·莫尔尼亚（Bruce Molnia）与马克·惠勒（Mark Wheeler）。 本次航次的核心任务为采集沉积物样品与岩芯，用于微古生物研究；所用地球物理数据源为3.5千赫兹（kHz）测深系统。 本数据集已从存储于海岸与海洋地质项目（Coastal and Marine Geology Program, CMGP）信息库野外活动目录（访问网址：http://walrus.wr.usgs.gov/infobank/d/d179eg/html/d-1-79-eg.meta.html）的空格分隔ASCII文本文件，转换为美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）下属国家地球物理数据中心（National Geophysical Data Center, NGDC）制定的MGD77T格式。MGD77T格式包含头文件（文档文件，后缀为.h77t）与数据文件（后缀为.m77t）。有关该格式的详细说明，可参见本元数据文件交叉参考部分所列的相关出版物。