l1282wg.m77t - MGD77 data file for Geophysical data from field activity L-12-82-WG in Western Gulf of Alaska from 09/22/1982 to 10/05/1982

Single-beam bathymetry, gravity, and magnetic data along with DGPS navigation data was collected as part of field activity L-12-82-WG in Western Gulf of Alaska from 09/22/1982 to 10/05/1982, http://walrus.wr.usgs.gov/infobank/l/l1282wg/html/l-12-82-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/l1282wg/html/l-12-82-wg.bath.html, http://walrus.wr.usgs.gov/infobank/l/l1282wg/html/l-12-82-wg.grav.html, and http://walrus.wr.usgs.gov/infobank/l/l1282wg/html/l-12-82-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.

1982年9月22日至1982年10月5日，科考团队于阿拉斯加湾西部开展野外作业L-12-82-WG（field activity L-12-82-WG）期间，采集了单波束测深数据、重力数据、磁数据以及差分GPS导航数据（Differential GPS, DGPS），相关元数据可通过以下链接查询：http://walrus.wr.usgs.gov/infobank/l/l1282wg/html/l-12-82-wg.meta.html。
本数据集源自沿海与海洋地质项目（Coastal and Marine Geology Program, CMGP）信息库野外作业目录下的空格分隔ASCII文本文件，经重新格式化为美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）国家地球物理数据中心（National Geophysical Data Center, NGDC）制定的MGD77T格式，对应各类型原始数据的访问链接分别为：
http://walrus.wr.usgs.gov/infobank/l/l1282wg/html/l-12-82-wg.bath.html
http://walrus.wr.usgs.gov/infobank/l/l1282wg/html/l-12-82-wg.grav.html
http://walrus.wr.usgs.gov/infobank/l/l1282wg/html/l-12-82-wg.mag.html

MGD77T格式包含头文件（.h77t，含文档说明）与数据文件（.m77t）。有关该格式的更多细节，可参见本元数据文件交叉引用部分所列的相关出版物。