u471cb.m77t - MGD77 data file for Geophysical data from field activity UGEOLEG_4 (U-4-71-CB) in Venezuela, Caribbean Sea from 08/18/1971 to 10/01/1971

Single-beam bathymetry,gravity, and magnetic data along with transit satellite navigation data was collected as part of field activity UGEOLEG_4 (U-4-71-CB) in Venezuela, Caribbean Sea from 08/18/1971 to 10/01/1971, http://walrus.wr.usgs.gov/infobank/u/u471cb/html/u-4-71-cb.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/u471cb/html/u-4-71-cb.bath.html http://walrus.wr.usgs.gov/infobank/u/u471cb/html/u-4-71-cb.grav.html and http://walrus.wr.usgs.gov/infobank/u/u471cb/html/u-4-71-cb.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.

本数据集涵盖单波束测深（Single-beam bathymetry）、重力、磁法数据，以及过境卫星导航数据，采集于加勒比海委内瑞拉海域的UGEOLEG_4（U-4-71-CB）野外作业项目，采集时段为1971年8月18日至1971年10月1日，元数据来源链接：http://walrus.wr.usgs.gov/infobank/u/u471cb/html/u-4-71-cb.meta.html

本数据集的数据源自海岸与海洋地质计划（Coastal and Marine Geology Program, CMGP）信息库野外作业目录中的以空格分隔的ASCII文本文件，对应的数据页面链接分别为：http://walrus.wr.usgs.gov/infobank/u/u471cb/html/u-4-71-cb.bath.html、http://walrus.wr.usgs.gov/infobank/u/u471cb/html/u-4-71-cb.grav.html 及 http://walrus.wr.usgs.gov/infobank/u/u471cb/html/u-4-71-cb.mag.html。现已被重新格式化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）提供的MGD77T格式。MGD77T格式包含头文件（文档文件，后缀为.h77t）与数据文件（后缀为.m77t）。有关该格式的更多信息，可参见本元数据文件交叉参考部分列出的相关出版物。