World Data Service for Geophysics, Boulder

Marine Geophysical Trackline Data

NGDC's Marine Trackline Geophysics database provides access to bathymetry, magnetics, gravity and seismic reflection data collected during marine cruises from 1939 to the present. Coverage is worldwide. Data sources include both US and non-US oceanographic institutions, universities, and government agencies.

Locating and Downloading Data:

Data are distributed online via an interactive ArcGIS map viewer. Searches by geographic area, year of cruise, institution, platform, cruise, date or parameter are available. Downloads can be customized to area, parameter and format.

Digital data files can be exported in a variety of forms, including the MGD77 Exchange Format, and contain a documentation header record and a series of data records. Header records document the content and structure of the data records. Data records contain geophysical data (bathymetry, magnetics, gravity and seismic shot-point ids) with time and position.

NGDC also archives analog geophysical data including seismic reflection and refraction, side-scan sonar, and other data types. Analog underway geophysical data are also searchable and downloadable as scanned image files.

Frequently Asked Questions:

1. What happened to the Marine Trackline (GEODAS) DVD-ROM?
2. Where is GEODAS (GEOphysical DAta System)?
3. Where is the GEODAS Grid Translator (Design-a-Grid)?
   
   Answer: Read more about how Marine Geophysical data access is evolving at NGDC.

Contributing Data:
NGDC is pleased to accept contributions of underway geophysical data on almost any media, preferably in the MGD77 Format. Any data received are in the international public domain, readily available globally to any interested individual or group.