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NOAA National Bathymetric Source Data

bathymetry earth observation marine navigation model oceans oceans


The National Bathymetric Source (NBS) project creates and maintains high-resolution bathymetry composed of the best available data. This project enables the creation of next-generation nautical charts while also providing support for modeling, industry, science, regulation, and public curiosity. Primary sources of bathymetry include NOAA and U.S. Army Corps of Engineers hydrographic surveys and topographic bathymetric (topo-bathy) lidar (light detection and ranging) data. Data submitted through the NOAA Office of Coast Survey’s external source data process are also included, with gaps in deep water filled through Global Multi-Resolution Topography, a merged model of bathymetry. Different vertical datums and file formats are made available to meet various uses. The BlueTopo folder includes multilayer floating point GeoTIFFs with associated Raster Attribute Tables (RAT) containing elevation, vertical uncertainty, with other quality metrics and source information. These files are arranged in a spatial tiling and resolution scheme corresponding to the Electronic Navigational Chart (ENC) but are not for navigation due to the inclusion of additional non-navigation data and non-navigation vertical datums. For navigational datasets please see the S-102 distribution portal. "nowCOAST" provides public access to BlueTopo through the nowCOAST viewer, web map tile services (WMTS), and links to individual datasets.

Update Frequency

Monthly where new data is available.


Creative Commons licenses are attached to each file and, where available, are attached to the consituent sources within the file. The compilation is provided as a government work under CC0, but the individual sources may have copyright and limitations on use.


Managed By

See all datasets managed by NOAA.


For general questions or feedback about the data, please submit inquiries through the NOAA Office of Coast Survey (OCS) "ASSIST Tool". For any data delivery issues, please contact the NOAA Open Data Dissemination Team (NODD) at

How to Cite

NOAA National Bathymetric Source Data was accessed on DATE from

Resources on AWS

  • Description
    NOAA National Bathymetric Source Data
    Resource type
    S3 Bucket
    Amazon Resource Name (ARN)
    AWS Region
    AWS CLI Access (No AWS account required)
    aws s3 ls --no-sign-request s3://noaa-ocs-nationalbathymetry-pds/
    Browse Bucket
  • Description
    NOAA National Bathymetry New Object Notification
    Resource type
    SNS Topic
    Amazon Resource Name (ARN)
    AWS Region

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