The U.S. Interagency Elevation Inventory shows availability of high-accuracy topographic and bathymetric data for the United States and its territories. The project is a collaborative effort between 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. OpenTopography federates access to the USIEI as a service to our users. Visit United States Interagency Elevation Inventory to learn more about the USIEI.
Lidar data are a densely spaced network of highly accurate georeferenced elevation points—often called a point cloud—collected using a laser, that provide a representation of the Earth's surface. For shoreline data, both topographic elevations and bathymetric depths are collected to provide a seamless representation of the Earth’s surface across the land–water interface.
Lidar data are a densely spaced network of highly accurate georeferenced elevation points—often called a point cloud—collected using a laser, that provide a representation of the Earth's surface. For this data type, lidar technology is used to collect topographic (land) elevations.
Lidar data are a densely spaced network of highly accurate georeferenced elevation points—often called a point cloud—collected using a laser, that provide a representation of the Earth's surface. For this data type, lidar technology is used to collect bathymetric (undersea) elevations.
IfSAR is an acronym for “Interferometric Synthetic Aperture Radar.” The data collected by this technology are used to produce topographic elevation information in the form of orthorectified radar imagery (ORRI) that can be analyzed to produce digital elevation models (DEMs). A DEM consists of terrain elevations at regularly spaced horizontal intervals.
Other bathymetric surveys are water depth data collected by academic and other nongovernmental sources.
Topobathy Shoreline Lidar 
Topographic Lidar 
Bathymetric Lidar 
IfSAR 
Other Bathymetric