u171gm.m77t - MGD77 data file for Geophysical data from field activity UGEOLEG_1 (U-1-71-GM) in Bay of Campeche, Gulf of Mexico from 05/27/1971 to 06/21/1971

Single-beam bathymetry, gravity, and magnetic data along with transit satellite navigation data was collected as part of field activity UGEOLEG_1 (U-1-71-GM) in Bay of Campeche, Gulf of Mexico from 05/27/1971 to 06/21/1971, http://walrus.wr.usgs.gov/infobank/u/u171gm/html/u-1-71-gm.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/u/u171gm/html/u-1-71-gm.bath.html http://walrus.wr.usgs.gov/infobank/u/u171gm/html/u-1-71-gm.grav.html and http://walrus.wr.usgs.gov/infobank/u/u171gm/html/u-1-71-gm.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.

1971年5月27日至6月21日，科研团队于墨西哥湾坎佩切湾开展编号为UGEOLEG_1（U-1-71-GM）的野外作业，采集了单波束测深（Single-beam bathymetry）、重力、磁力及过境卫星导航数据，相关元数据可通过http://walrus.wr.usgs.gov/infobank/u/u171gm/html/u-1-71-gm.meta.html查询。本数据集的数据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，对应原始数据文件可通过以下链接获取：http://walrus.wr.usgs.gov/infobank/u/u171gm/html/u-1-71-gm.bath.html、http://walrus.wr.usgs.gov/infobank/u/u171gm/html/u-1-71-gm.grav.html 及 http://walrus.wr.usgs.gov/infobank/u/u171gm/html/u-1-71-gm.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（National Oceanic and Atmospheric Administration, NOAA）国家地球物理数据中心（National Geophysical Data Center, NGDC）提供的MGD77T格式，该格式包含头文件（.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。