j200sf.m77t and j200sf.h77t: MGD77T data and header files for single-beam bathymetry data for field activity J-2-00-SF in Grizzly Bay, San Pablo Bay from 03/22/2000 to 03/27/2000

Single-beam bathymetry data along with GPS navigation data was collected as part of the U.S. Geological Survey cruise J-2-00-SF. The cruise was conducted in Grizzly Bay and San Pablo Bay in the San Francisco Bay area, California from March 22 to March 27, 2000. The chief scientist was Bruce Jaffe from the USGS Coastal and Marine Geology office in Menlo Park, CA. The purpose of this cruise was for ground truthing, and to collect box cores and gravity cores. 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/j/j200sf/html/j-2-00-sf.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.本数据集包含单波束测深数据（single-beam bathymetry data）与GPS导航数据（GPS navigation data），系美国地质调查局（U.S. Geological Survey, USGS）航次J-2-00-SF的采集成果。该航次于2000年3月22日至27日在加利福尼亚州旧金山湾区的格里兹利湾（Grizzly Bay）与圣巴勃罗湾（San Pablo Bay）实施，首席科学家为来自加州门洛帕克市USGS海岸与海洋地质办公室的布鲁斯·贾菲（Bruce Jaffe）。本次航次的任务目标为开展地面验证（ground truthing），并采集箱式岩心与重力岩心。 本数据集源自存放于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）的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/j/j200sf/html/j-2-00-sf.meta.html）中的以空格分隔的ASCII文本文件，已被重新格式化为NGDC提供的MGD77T格式。MGD77T格式包含头文档文件（.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（Cross_reference）章节中列出的相关出版物。