k193hw.m77t and k193hw.h77t: MGD77T data and header files for single-beam bathymetry data for field activity K-1-93-HW in Oahu, Hawaii from 02/20/1993 to 02/26/1993

Single-beam bathymetry data along with DGPS navigation data was collected as part of the U.S. Geological Survey cruise K-1-93-HW. The cruise was conducted in Oahu, Hawaii from February 20 to February 26, 1993. The chief scientist was Mike Torresan from the USGS Coastal and Marine Geology office in Menlo Park, CA.
The purpose of this cruise was to create a detailed bathymetric map of the Mamala Bay seafloor that delimits the general extent of the acoustically-resolvable dredged material deposits. The geophysical source was a 12 kilohertz (kHz) Raytheon 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/k/k193hw/html/k-1-93-hw.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）K-1-93-HW航次采集的单波束测深数据（Single-beam bathymetry data）与差分GPS（DGPS, Differential Global Positioning System）导航数据。该航次于1993年2月20日至26日在夏威夷州瓦胡岛海域开展，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Mike Torresan。
本次航次的核心目标为绘制玛马拉湾（Mamala Bay）海底详细测深图，以明确可通过声学手段识别的疏浚沉积物堆积体的大致分布范围。本次勘探所用的地球物理声源为12千赫兹（kHz）雷神（Raytheon）系统。
本数据集源自海岸与海洋地质计划（Coastal and Marine Geology Program, CMGP）信息库野外活动目录（网址：http://walrus.wr.usgs.gov/infobank/k/k193hw/html/k-1-93-hw.meta.html）中的空格分隔ASCII文本文件，经格式转换后采用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格式存储。MGD77T格式包含两类文件：头文档文件（.h77t）与数据文件（.m77t）。有关该格式的详细信息，可查阅本元数据文件交叉引用部分所列的公开出版物。