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，采集自美国地质调查局（U.S. Geological Survey, USGS）编号为J-2-00-SF的航次。该航次于2000年3月22日至27日，在美国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）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Bruce Jaffe。本航次的任务为开展实地验证，并采集箱式岩芯与重力岩芯。 本数据集由原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（网址：http://walrus.wr.usgs.gov/infobank/j/j200sf/html/j-2-00-sf.meta.html）中的空格分隔ASCII文本文件，重新格式化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）。有关该格式的更多详情，可查阅本元数据文件交叉参考（Cross_reference）章节中列出的相关出版物。