b174ar.m77t - MGD77 data file for Geophysical data from field activity B-1-74-AR in Arctic from 07/13/1974 to 08/30/1974

Single-beam bathymetry, gravity, and magnetics data along with transit satellite navigation data was collected as part of field activity B-1-74-AR in Arctic from 07/13/1974 to 08/30/1974, http://walrus.wr.usgs.gov/infobank/b/b174ar/html/b-1-74-ar.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/b174ar/html/b-1-74-ar.bath.html http://walrus.wr.usgs.gov/infobank/b/b174ar/html/b-1-74-ar.grav.html and http://walrus.wr.usgs.gov/infobank/b/b174ar/html/b-1-74-ar.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.

单波束测深（Single-beam bathymetry）数据、重力数据、磁法数据与过境卫星导航数据，于1974年7月13日至8月30日期间，作为北极地区B-1-74-AR野外作业的一部分被采集，相关元数据链接为：http://walrus.wr.usgs.gov/infobank/b/b174ar/html/b-1-74-ar.meta.html

本数据集源自美国地质调查局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，原始数据文件链接分别为：http://walrus.wr.usgs.gov/infobank/b/b174ar/html/b-1-74-ar.bath.html、http://walrus.wr.usgs.gov/infobank/b/b174ar/html/b-1-74-ar.grav.html 与 http://walrus.wr.usgs.gov/infobank/b/b174ar/html/b-1-74-ar.mag.html。MGD77T格式包含头文件（文档文件，.h77t）与数据文件（.m77t）。有关该格式的详细信息，可参阅本元数据文件交叉参考部分所列的出版物。