World Data Service for Geophysics
Marine Geophysical Trackline Data
NGDC's Marine Trackline Geophysics database provides access to bathymetry (single-beam), magnetics, gravity and seismic reflection data collected during marine cruises from 1939 to the present. Data sources include US and non-US oceanographic institutions, universities, and government agencies with worldwide data coverage.
Locating and Downloading Data
Data are distributed online via the Geophysical Survey Data Viewer (an ArcGIS interactive map). Searches
by geographic area, year of survey, institution, platform, survey name, date added to the database, and data type are available. Downloads can be customized to area, data type, and format.
NGDC is pleased to accept contributions of underway geophysical data on almost any media, preferably in the MGD77T Format. Any data received are in the international public domain, readily available globally to any interested individual or group. If you are interested in contributing data, please contact