l881wg.m77t - MGD77 data file for Geophysical data from field activity L-8-81-WG in Western Gulf of Alaska from 07/04/1981 to 07/16/1981

Single-beam bathymetry, magnetics, and gravity data along with transit satellite navigation data was collected as part of field activity L-8-81-WG in Western Gulf of Alaska from 07/04/1981 to 07/16/1981, http://walrus.wr.usgs.gov/infobank/l/l881wg/html/l-8-81-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/l881wg/html/l-8-81-wg.bath.html http://walrus.wr.usgs.gov/infobank/l/l881wg/html/l-8-81-wg.grav.html http://walrus.wr.usgs.gov/infobank/l/l881wg/html/l-8-81-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.

1981年7月4日至1981年7月16日，相关科研团队于阿拉斯加湾西部开展野外作业L-8-81-WG（field activity L-8-81-WG），期间采集了单波束测深（Single-beam bathymetry）、磁法数据（magnetics）、重力数据（gravity data）以及过境卫星导航数据（transit satellite navigation data），相关元数据页面为：http://walrus.wr.usgs.gov/infobank/l/l881wg/html/l-8-81-wg.meta.html

本数据集源自海岸与海洋地质计划（Coastal and Marine Geology Program, CMGP）信息库（InfoBank）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）制定的MGD77T格式，对应原始数据的三个链接分别为：http://walrus.wr.usgs.gov/infobank/l/l881wg/html/l-8-81-wg.bath.html、http://walrus.wr.usgs.gov/infobank/l/l881wg/html/l-8-81-wg.grav.html、http://walrus.wr.usgs.gov/infobank/l/l881wg/html/l-8-81-wg.mag.html。MGD77T格式包含头文档文件（.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出版物。