United States Interagency Elevation Inventory

The U.S. Interagency Elevation Inventory displays high-accuracy topographic and bathymetric data for the United States and its territories. The project is a collaborative effort of NOAA and the U.S. Geological Survey, with contributions from the Federal Emergency Management Agency, U.S. Department of Agriculture, and U.S. Army Corps of Engineers. This resource is a comprehensive, nationwide listing of known high-accuracy topographic data, including lidar and IfSAR, and bathymetric data, including NOAA hydrographic surveys, multibeam data, and bathymetric lidar.

The information provided for each elevation dataset includes many attributes such as vertical accuracy, point spacing, and date of collection. 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 current as of November 2012. These data are static snapshots of availability that will soon be replaced with a dynamic map service.


  • Provides an index of elevation data
  • Includes both topographic and bathymetric data and covers the entire nation
  • Allows users to query by county or zoom to an area of interest and print a report

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/.