l980bs.m77t - MGD77 data file for Geophysical data from field activity L-9-80-BS in Bering Sea, Alaska from 09/24/1980 to 10/06/1980

Single-beam bathymetry, magnetics, and gravity data along with transit satellite navigation data was collected as part of field activity L-9-80-BS in Bering Sea, Alaska from 09/24/1980 to 10/06/1980, http://walrus.wr.usgs.gov/infobank/l/l980bs/html/l-9-80-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/l980bs/html/l-9-80-bs.bath.html http://walrus.wr.usgs.gov/infobank/l/l980bs/html/l-9-80-bs.grav.html http://walrus.wr.usgs.gov/infobank/l/l980bs/html/l-9-80-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9月24日至1980年10月6日，科研团队在阿拉斯加州白令海开展野外活动L-9-80-BS期间，采集了单波束测深数据（Single-beam bathymetry）、磁法数据（magnetics data）、重力数据（gravity data）及过境卫星导航数据（transit satellite navigation data），相关元数据页面：http://walrus.wr.usgs.gov/infobank/l/l980bs/html/l-9-80-bs.meta.html。

本数据集源自存放在海岸与海洋地质项目（Coastal and Marine Geology Program, CMGP）信息库野外活动目录中的空格分隔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，原始数据文件链接分别为：
http://walrus.wr.usgs.gov/infobank/l/l980bs/html/l-9-80-bs.bath.html
http://walrus.wr.usgs.gov/infobank/l/l980bs/html/l-9-80-bs.grav.html
http://walrus.wr.usgs.gov/infobank/l/l980bs/html/l-9-80-bs.mag.html

MGD77T格式包含头文档文件（后缀为.h77t）与数据文件（后缀为.m77t）。有关该格式的更多信息，可参阅本元数据文件交叉引用（Cross_reference）部分所列的相关出版物。