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Short Citation:
Office for Coastal Management, 2023: Bathymetry Digital Elevation Model,

Item Identification

Title: Bathymetry Digital Elevation Model
Status: Completed

This Digital Elevation Model (DEM) created for the Ocean Reports application is a combination of the NCEI Coastal Relief Model (CRM) and the GEBCO (2014) 1 arc-minute 2-dimensional bathymetric datasets. All components of the two models were resampled to 3 arc-seconds (as needed) and then mosaicked together to form the final output grid. The CRM integrates offshore bathymetry with land topography into a seamless representation of the coast. The CRM has a 3 arc-second resolution, except Alaska (24 arc-seconds), and spans the U.S. East and West coasts, the northern coast of the Gulf of Mexico, Puerto Rico, Hawaii, and Alaska, reaching out to and beyond the continental slope. Land and water portions of the CRM were used to construct the final DEM. The GEBCO data has a 1 arc-minute resolution and was supplemented in deeper portions of the ocean where the CRM data are not available. Where overlap occurred, CRM data were given precedence over GEBCO data. It should be noted that these are the best available data at the spatial extent needed (the entire U.S. Exclusive Economic Zone), but higher-resolution digital elevation models may be available for local or regional areas.


To support ocean planning activities pursuant to the Executive Order Regarding the Ocean Policy to Advance the Economic, Security, and Environmental Interests of the United States, the Energy Policy Act, the National Environmental Policy Act, the Rivers and Harbors Act, and the Coastal Zone Management Act.

Supplemental Information:

Bureau Code: 006:48, Program Code: 006:055


Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords
ISO 19115 Topic Category
ISO 19115 Topic Category
ISO 19115 Topic Category
ISO 19115 Topic Category
None coastal
None planning
None renewable energy

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords
None Exclusive Economic Zone
None Outer Continental Shelf
None Territorial Sea
None United States of America

Physical Location

City: Charleston
State/Province: SC

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: As Needed
Data Presentation Form: Map (digital)
Distribution Liability:

Data Set Credit: NOAA National Centers for Coastal Ocean Science, NOAA Office for Coastal Management, NOAA Office of Coast Survey, International Hydrographic Organization, General Bathymetric Chart of the Oceans, Intergovernmental Oceanographic Commission, United Nations Educational, Scientific and Cultural Organization

Support Roles

Point of Contact

CC ID: 1114665
Date Effective From: 2018-06
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202


Currentness Reference: Publication Date

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 1114676
W° Bound: -179.999989
E° Bound: 179.999989
N° Bound: 74.70875
S° Bound: 13.999263

Access Information

Security Class: Unclassified
Data Use Constraints:

For coastal and ocean planning

Distribution Information

Distribution 1

CC ID: 1114668
Download URL:

Distribution 2

CC ID: 1121088
Download URL:

Ocean Reports

Technical Environment


Microsoft Windows, ArcGIS Pro

Data Quality



Horizontal Positional Accuracy:

Compiled to meet 10 meters horizontal accuracy at 95% confidence interval

Completeness Report:


Conceptual Consistency:

These data are logically consistent



NOAA's Coastal Relief Model (CRM) and GEBCO Gridded Bathymetric Data

CC ID: 1114673
Contact Name: NOAA NCEI and GEBCO
Extent Type: Discrete
Extent Start Date/Time: 2018-08-01
Citation URL:
Citation URL Name: Source Online Linkage
Citation URL Description:

URL where the source data were originally accessed.

Source Contribution:

Digital Elevation Model (DEM) for U.S. Exclusive Economic Zone (EEZ)

Process Steps

Process Step 1

CC ID: 1114674

(1) Bathymetry grids were downloaded from each of the data sources in NetCDF format. (2) The GEBCO and Alaska CRM grids were resample to 3 arc-seconds to match the remaining CRM regional grids. During resampling the GEBCO grid was broken up in to four equal parts (NE, NW, SE and SW) to reduce the memory load during processing. (3) CRM data that overlapped each of the four GEBCO parts were then blended on to the GEBCO data. CRM data was given priority over GEBCO data, where it was available. (4) The four sections (NE, NW, SE and SW) were then combined to create the final grid encompassing the region of interest. (5) File size: 12 GB (NetCDF received from Michael Coyne), converted to raster (40 gb), clipped to the EEZ and coastline file leaving a file size 16.4 gb in a file geodatabase for the US waters. However, these data must be converted to a GeoTiff for final delivery. (6) Projected data to WGS 1984 World Mercator (ID: 3395), and 7) Project to NAD83 GRS80 4269

Process Date/Time: 2018-08-01 00:00:00

Catalog Details

Catalog Item ID: 66106
GUID: gov.noaa.nmfs.inport:66106
Metadata Record Created By: Brianna Key
Metadata Record Created: 2021-12-21 21:39+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2023-05-30 18:10+0000
Metadata Record Published: 2021-12-22
Owner Org: OCM
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2021-12-22
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2022-12-22