NGDC Marine Trackline Geophysics DatabaseBack to Collection NOAA/NESDIS/NGDC/Collection
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NGDC Marine Trackline Geophysics Database
This data set contains bathymetry, magnetic, gravity and seismic shot point navigation data collected during marine cruises from 1939 to the present. Coverage is worldwide. These data are stored in the MGD77 exchange format and are available for download in a variety of user selectable formats. One Header record and multiple Data records are available for a particular cruise/leg (port to port operation). The Header record documents both the content and the structure of the subsequent Data records, containing that part of the data that remains invariant throughout the cruise. The Data records present geophysical data (bathymetry, magnetics and gravity) and seismic information (shot-point identification) with a corresponding time and position. Documentation that varies within the cruise is also included with the data records. Data are fully searchable on-line by geographic area, year of cruise, institution, platform, cruise, date or data type.

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Geophysical Survey Data
Search for Marine Geophysical Trackline Data
Marine Geophysical Trackline Data Homepage
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.
Format version: (version is unknown)
Format version: (version is unknown)
Depends on the Data Set

Ordering Instructions
Ordering Instructions: Trackline data can be obtained by visiting the Geophysical Survey Data Viewer at The user must then select the desired parameters (bathymetry, magnetics, gravity or seismic) and any other applicable filters. The user is then able to get all of the data that fit this criteria (within certain size limits) or may further refine their request by designating an area of interest. The user is then taken to a landing page where they can further refine the data that they would like to be delivered, format, and any other data that is available. The user then provides an email address where the user will be informed when their data package is available for download.