United States Interagency Elevation Inventory

This catalog of publicly available, high-accuracy elevation data for the United States and its territories is collaboratively maintained by five federal agencies. It provides an important central location for information about elevation data sets and decreases duplication of effort from unnecessary data collections.


  • Catalogs topographic data, including lidar and IfSAR, and bathymetric data, including NOAA hydrographic surveys, multibeam data, and lidar
  • Provides details about data sets including vertical accuracy, point spacing, and data access information
  • Allows users to query available data for an area of interest and share a link

Stories from the Field

Exploring Water Level Scenarios to Inform Shoreline Management on Lake Ontario
Lake-level drop scenarios and digital elevation models help regulators make informed shoreline management decisions.


Frequently Asked Questions

Topographic and Bathymetric Data Considerations
Describes processes to generate high-resolution digital elevation models that minimize error

Coastal Applications of High Resolution Elevation Data
Provides examples of coastal applications of high-accuracy elevation data

Coastal Digital Elevation Model (DEM) Resources

Seamless Topographic/Bathymetric Elevation Model for Tampa Bay, Florida
The U.S. Geological Survey and NOAA joined efforts to produce a 1-arc second topobathy elevation product for Tampa Bay. For more information, see the article by Gesch and Wilson, "Development of a Seamless Multisource Topographic/Bathymetric Elevation Model for Tampa Bay, Marine Technology Society Journal, Volume 35, Number 4 (2001). Follow this link for additional information on this project.

NOAA NGDC Tsunami Inundation Gridding Project
NOAA's National Geophysical Data Center (NGDC) is building high-resolution DEMs for select U.S. coastal regions. These combined bathymetric/topographic DEMs are used to support tsunami forecasting and modeling efforts at the NOAA Center for Tsunami Research, Pacific Marine Environmental Laboratory. Visit www.ngdc.noaa.gov/mgg/inundation/.

NOAA NGDC Digital Elevation Model (DEM) Discovery Portal
NGDC has created a geospatial on-line catalog that links to Web-published DEMs. This portal uses an ArcIMS map interface to locate, preview, and link to DEM webpages for download. Find the portal at www.ngdc.noaa.gov/mgg/dem/demportal.html

USGS Topobathy Viewer
The topobathy viewer provides a dynamic on-line map interface that can be used to view U.S. Geological Survey (USGS) topobathy DEMs: http://edna.usgs.gov/TopoBathy_Viewer/

USGS Alaska Topobathy DEM
A seamless topographic/bathymetric surface has been created for the area around the coastal town of Seward, Alaska. This DEM was created by combining high-resolution lidar topography and multibeam bathymetry. It was developed to study submarine landslides and tsunamis produced by the 1964 earthquake and for generating computer models of tsunami wave propagation and inundation. Access to the article is through the following Web address: http://pubs.usgs.gov/ds/374/.

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The last comprehensive update to the topographic portion of the inventory was completed in March 2015. However, many corrections and additions are made between comprehensive updates. Bathymetric data are provided via map service, so this information is continuously updated by the authoritative source.