Bathymetry, Topography, and Relief Data
http://www.ngdc.noaa.gov/mgg/bathymetry/relief.html

National Geophysical Data Center, NOAA


This extensive site from NOAA's National Geophysical Data Center provides a collection of bathymetry, topography, and relief data from a variety of sources and environments including coastlines, the Great Lakes, and the seafloor. The site also features the National Ocean Service (NOS) hydrographic database. Some images and data can be downloaded at no charge, while others may be purchased on CD-ROM or DVD. The site can be searched for downloadable data using the GEODAS Data Search and Retrieval System. Data products from NOS surveys, including Descriptive Reports (DRs), smooth sheet images, survey data images, textual gridded data, and sidescan sonar mosaics, are available for download using the National Ocean Service Hydrographic Survey Data Map Service, an ArcIMS interactive map and data discovery tool.

This resource is referenced here:
Subject: Geoscience:Oceanography, Geology:Geophysics
Resource Type: Datasets and Tools:Datasets with Tools, Audio/Visual:Maps, Scientific Resources:Collection, Datasets and Tools:Tools, Scientific Resources:Overview/Reference Work, Audio/Visual:Images/Illustrations, Datasets and Tools:Datasets
Data Derived: Data Derived
Data Source: Observational Data, Real-Time Data
Ocean Environments: Shallow Sea Floor/Continental Shelf, Deep Sea Floor/Abyssal, Coastal and Estuarine
Science Background Required: Basic scientific background required
Theme: Teach the Earth:Course Topics:Geophysics, Oceanography