l476wg.m77t - MGD77 data file for Geophysical data from field activity L-4-76-WG in Western Gulf of Alaska from 06/26/1976 to 07/25/1976

Single-beam bathymetry, magnetics, gravity data along with DGPS navigation data was collected as part of field activity L-4-76-WG in Western Gulf of Alaska from 06/26/1976 to 07/25/1976, http://walrus.wr.usgs.gov/infobank/l/l476wg/html/l-4-76-wg.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/l476wg/html/l-4-76-wg.bath.html, http://walrus.wr.usgs.gov/infobank/l/l476wg/html/l-4-76-wg.grav.html, and http://walrus.wr.usgs.gov/infobank/l/l476wg/html/l-4-76-wg.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.

1976年6月26日至7月25日，科研人员在阿拉斯加湾西部开展野外作业L-4-76-WG期间，采集得到单波束测深（Single-beam bathymetry）、磁法数据、重力数据以及差分GPS（DGPS, Differential Global Positioning System）导航数据，相关元数据访问地址为：http://walrus.wr.usgs.gov/infobank/l/l476wg/html/l-4-76-wg.meta.html

本批数据源自存放于海岸与海洋地质项目（CMGP, Coastal and Marine Geology Program）信息库野外作业目录下的以空格分隔的ASCII文本文件，相关文件的访问地址分别为：http://walrus.wr.usgs.gov/infobank/l/l476wg/html/l-4-76-wg.bath.html、http://walrus.wr.usgs.gov/infobank/l/l476wg/html/l-4-76-wg.grav.html 以及 http://walrus.wr.usgs.gov/infobank/l/l476wg/html/l-4-76-wg.mag.html。数据已被重新格式化为由美国国家海洋和大气管理局（NOAA, National Oceanic and Atmospheric Administration）下属国家地球物理数据中心（NGDC, National Geophysical Data Center）提供的MGD77T格式。该格式包含头部（文档）文件（.h77t）与数据文件（.m77t）。有关该格式的更多详细信息，可查阅本元数据文件交叉参考部分所列的相关出版物。