SUMD Portal:

Surface Underway Marine Database Portal

The NCEI Surface Underway Marine Database (SUMD) provides a comprehensive set of uniformly, quality-controlled in situ sea surface measurements from thermosalinographs, meteorological sensors and others from 1980 to the present. Data are a collection from more than 450 ships and unmanned surface vehicles. Data are stored in the NCEI NetCDF format with the trajectory feature type. This data access portal allows you to search the SUMD by data parameter, data source, observation date and spatial range.

Data Parameters

Data Sources

Choose one:

Observation Dates (1980-01-03 to Present)

Due to technical issues, date search is not working now, but other search functions still work. We are working on fixing the date issue. More information about the Surface Underway Marine Database can be found here. Data can also be downloaded directly via HTTPS and FTP.
Start date:
End date: 

Additional Terms

Search for:

Geographic Coverage

Hold the "shift" key and drag to select an area.
West: East:

Searching for:
Variables / Parameters:
Observation Category:
Observation Dates:
Geographic Coverage:
Additional Terms:


Since we are downloading all the files in the search results, it takes time for the system to process the request. Please view the status of the download request below

Please click here if the download does not begin in about 15-20 minutes.

Note: The progress bar is just an approximation of the progress of the download. Actual download might begin few minutes before or after the progress bar is complete.