g176ar.m77t - MGD77 data file for Geophysical data from field activity G-1-76-AR in Arctic from 09/07/1976 to 10/02/1976

Single-beam bathymetry data along with DGPS navigation data was collected as part of field activity G-1-76-AR in Arctic from 09/07/1976 to 10/02/1976, http://walrus.wr.usgs.gov/infobank/g/g176ar/html/g-1-76-ar.meta.html
The geophysical source was a Knudsen 12 kHz 320B/R echosounder.
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/g/g176ar/html/g-1-76-ar.bath.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7月9日至1976年10月2日期间，在北极地区开展的野外作业G-1-76-AR获取了单波束测深数据与差分全球定位系统（Differential Global Positioning System, DGPS）导航数据，相关元数据访问地址为：http://walrus.wr.usgs.gov/infobank/g/g176ar/html/g-1-76-ar.meta.html
本次作业采用的地球物理探测声源为Knudsen 12 kHz 320B/R型回声测深仪。
本数据集已从存储于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文本文件格式，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）制定的MGD77T格式，原始数据访问地址为：http://walrus.wr.usgs.gov/infobank/g/g176ar/html/g-1-76-ar.bath.html
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。