l680bs.m77t - MGD77 data file for Geophysical data from field activity L-6-80-BS in North Bering Sea, Alaska from 07/08/1980 to 07/28/1980

Single-beam bathymetry, gravity, and magnetic data along with DGPS navigation data was collected as part of field activity L-6-80-BS in North Bering Sea, Alaska from 07/08/1980 to 07/28/1980, http://walrus.wr.usgs.gov/infobank/l/l680bs/html/l-6-80-bs.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/l/l680bs/html/l-6-80-bs.bath.html, http://walrus.wr.usgs.gov/infobank/l/l680bs/html/l-6-80-bs.grav.html, and http://walrus.wr.usgs.gov/infobank/l/l680bs/html/l-6-80-bs.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.

1980年7月8日至7月28日，科研团队在阿拉斯加以北白令海开展野外作业L-6-80-BS，期间采集了单波束测深、重力、磁测数据以及差分GPS（Differential Global Positioning System, DGPS）导航数据，相关元数据可通过以下链接查阅：http://walrus.wr.usgs.gov/infobank/l/l680bs/html/l-6-80-bs.meta.html。
这些数据源自美国海岸与海洋地质项目（Coastal and Marine Geology Program, CMGP）信息库野外作业目录中的空格分隔ASCII文本文件，已被重新格式化为由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，原始数据文件的访问链接分别为：http://walrus.wr.usgs.gov/infobank/l/l680bs/html/l-6-80-bs.bath.html、http://walrus.wr.usgs.gov/infobank/l/l680bs/html/l-6-80-bs.grav.html 以及 http://walrus.wr.usgs.gov/infobank/l/l680bs/html/l-6-80-bs.mag.html。MGD77T格式包含头文档文件（.h77t）与数据文件（.m77t）。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列出的相关出版物。