b172sc.m77t - MGD77 data file for Geophysical data from field activity B-1-72-SC in Central California from 11/11/1972 to 11/15/1972

Single-beam bathymetry, gravity, and magnetics data along with transit satellite navigation data was collected as part of field activity B-1-72-SC in Central California from 11/11/1972 to 11/15/1972, http://walrus.wr.usgs.gov/infobank/b/b172sc/html/b-1-72-sc.meta.html

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/b/b172sc/html/b-1-72-sc.bath.html http://walrus.wr.usgs.gov/infobank/b/b172sc/html/b-1-72-sc.grav.html and http://walrus.wr.usgs.gov/infobank/b/b172sc/html/b-1-72-sc.mag.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.

1972年11月11日至11月15日，研究团队在加利福尼亚中部地区开展B-1-72-SC野外作业期间，采集了单波束测深（Single-beam bathymetry）数据、重力数据与磁法数据，同时获取了过境卫星导航数据。相关元数据可通过以下链接查阅：http://walrus.wr.usgs.gov/infobank/b/b172sc/html/b-1-72-sc.meta.html

本数据集由美国海岸与海洋地质计划（Coastal and Marine Geology Program, CMGP）信息库野外作业目录下的空格分隔ASCII文本文件重新格式化得到，对应的数据文件链接分别为：http://walrus.wr.usgs.gov/infobank/b/b172sc/html/b-1-72-sc.bath.html、http://walrus.wr.usgs.gov/infobank/b/b172sc/html/b-1-72-sc.grav.html 及 http://walrus.wr.usgs.gov/infobank/b/b172sc/html/b-1-72-sc.mag.html，最终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）提供的MGD77T格式。MGD77T格式包含头文件（.h77t，含文档说明）与数据文件（.m77t）两类文件。有关该格式的更多细节，可查阅本元数据文件交叉参考部分所列的相关出版物。