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The USGS provides the mapping and digital geospatial foundation for the Nation.

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 A 3DEP Image of Alaska's Denali Mountain
Updated digital elevation model (DEM) datasets are now renamed with a different naming convention to include resolution and format in the file name to prevent users from accidentally overwriting existing data with same file names across multiple resolutions and formats. For example, the file name of USGS_NED_13_n44w071_GridFloat.zip replaces an...
3DEP example
Cubic convolution and bilinear interpolation are the preferred methods of resampling digital elevation data, and will result in a smoother appearance. Nearest neighbor has a tendency to leave artifacts such as stair-stepping and periodic striping in the data which may not be apparent when viewing the elevation data but might affect derivative...
3DEP Map
Digital elevation model (DEM) data are available using The National Map Download Client, or through bulk data delivery. To download elevation data with The National Map Download Client: 1.  Zoom to your area of interest. 2.  Under the Data category, check the box next to ‘Elevation Products (3DEP)’ for available DEM products and coverage, or check...
Tampa Bay DEM
The 3DEP Data Dictionary, which provides textual definitions of the fields within the spatially referenced metadata for 3DEP products, may be downloaded from the Metadata download page.
Satellite image of Cape Hope, Northern Canada
Orthorectified radar (intensity) images (ORIs) are presently distributed only over areas of Alaska where ifsar data have been collected. ORIs are produced from the intensity of the radar signal reflected back to the ifsar sensor.  ORI availability can be found in The National Map Download Client under Elevation Source Data.
Lidar image
Lidar data from airborne sensors are available through The National Map Download Client. These data are discrete-return, classified point-cloud data provided in LAS format.
National Elevation Dataset
Digital surface models (DSMs) are presently distributed only over areas of Alaska where ifsar data have been collected. These DSMs represent the radar returns before any bare earth processing is applied. Ifsar DSM availability can be found in The National Map Download Client under Elevation Source Data (3DEP).
Rush Springs Model Viewer
We add breaklines to the metadata folder archive (.zip) for each lidar point cloud project on our public distribution FTP site, ftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/.
3D Lidar Point Cloud Image of San Francisco Bay and Golden Gate Bridge
Status maps showing 3DEP product availability and recent updates can be found on the 3DEP Product Availability web page. Shapefiles delineating update areas can be found at the 3DEP Product Metadata web page.
WI LaCrosse Shaded Relief US Topo (Browse Image for Story Map)
3DEP standard DEMs are produced from the highest quality elevation sources within the data holdings of the USGS National Geospatial Program. As of 2015, about 25% of the conterminous U.S. coverage is from high resolution lidar and photogrammetric source, while the remainder of CONUS and Hawaii coverage is from USGS topographic map contours. About...
The National Map Viewer Interface
To be compatible with other popular viewers, tiled base maps were cached using tiles that are 256x256 pixels in tile size and 96 DPI resolution, at global scale through 1:9,000. The cache is composed of over 1 billion tiles, and takes over 30 days to regenerate.
Mercator the Man
The projection used for all tiled base map services is the WGS84 Web Mercator (Auxiliary Sphere) so base map services can be used in combination with other common viewers, such as Google Maps and Microsoft Bing Maps.  For more info: see Spatial Reference SR-ORG:6928 and Spatial Reference SR-ORG:7483/. Dynamic overlay services are in WGS84 (see ...