l585nc.m77t - MGD77 data file for Geophysical data from field activity L-5-85-NC in Northern California from 08/10/1985 to 08/31/1985

Single-beam bathymetry and magnetics data along with DGPS navigation data was collected as part of field activity L-5-85-NC in Northern California from 08/10/1985 to 08/31/1985, http://walrus.wr.usgs.gov/infobank/l/l585nc/html/l-5-85-nc.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/l585nc/html/l-5-85-nc.bath.html and http://walrus.wr.usgs.gov/infobank/l/l585nc/html/l-5-85-nc.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.

1985年8月10日至1985年8月31日，科研团队在加利福尼亚北部开展野外作业L-5-85-NC期间，采集了单波束测深数据、磁力数据及差分全球定位系统(Differential Global Positioning System, DGPS)导航数据，相关元数据可通过以下链接查阅：http://walrus.wr.usgs.gov/infobank/l/l585nc/html/l-5-85-nc.meta.html

本次数据集的原始数据为存储于海岸与海洋地质计划(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，原始数据文件地址分别为：http://walrus.wr.usgs.gov/infobank/l/l585nc/html/l-5-85-nc.bath.html 与 http://walrus.wr.usgs.gov/infobank/l/l585nc/html/l-5-85-nc.mag.html；现数据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)国家地球物理数据中心(National Geophysical Data Center, NGDC)提供的MGD77T格式。

MGD77T格式包含头文档文件（后缀为.h77t）与数据文件（后缀为.m77t）。有关该格式的详细信息，可查阅本元数据文件交叉参考章节所列的相关出版物。