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

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Image of North Shore of Lake Tahoe from point could LiDAR data showing elevation intensity
NED data are still available and being updated continually, but the ‘NED’ terminology has been retired. The national DEM layers previously referred to as the ‘NED’ are now branded as 3DEP seamless DEMs. These seamless national DEM layers are just a few of the datasets offered in the broader suite of 3DEP elevation products. For a description of...
Lidar image of Pittsburgh
Seamless DEMs (2-, 1-, and 1/3-arc-second) are available in ArcGrid, GridFloat and IMG formats. Both of the 1/9 arc-second and 1 meter data are available in IMG format. Original product resolution DEMs are available in ArcGrid format. Accompanying metadata are available in TXT, XML and HTML with each download.
Alaska IfSAR Elevation Image
All 3DEP seamless DEMs are provided in geographic coordinates (longitude and latitude) in units of decimal degrees, horizontally referenced on the North American Datum of 1983 (NAD83). All elevation values are in units of meters, typically referenced to the North American Vertical Datum of 1988 (NAVD88), although the National Geodetic Vertical...
Digital elevation model created by an Unmanned Aerial System
National Elevation Dataset (NED) Release Notes were produced through February 2014 to provide details about bimonthly releases of the National Elevation Dataset (now referred to as 3DEP seamless DEMs).  These notes describe source data and noteworthy characteristics of the dataset including accuracy, data distribution statistics, and tile...
National Elevation Dataset
Yes, the file naming convention in the ned19readme.pdf should be as follows where corrections are noted in bold type: Example:  ned19_n40x50_w074x50_nj_mercerco_2008      ned19 = Elevation Product      n40x50_w074x50 = North Latitude of 40.50 degrees                                    West Longitude of 74.50 degrees...
northwest US and southwest Canada elevation
Specific data for current mountain peak elevations do not exist at USGS other than what was previously published in an Elevations and Distances in the United States booklet. A way to determine an approximate elevation at a specific point is to use the spot elevation tool query in The National Map viewer or through the point query service....
Tampa Bay DEM
Specific data for average (or mean) county elevations for the United States are not presently available from the USGS. You can extract an elevation for the centroid of each county polygon using Esri ArcGIS software (see procedures below). You can also use the Geographic Names Information System (GNIS) query form to find an elevation on the...
Lidar image
Yes, lidar data are represented as a cloud of variably spaced point locations (x,y,z) of any terrestrial target reflecting the laser pulse. In addition to bare-earth, the point cloud will typically include buildings, trees, towers, and powerlines. 3DEP DEMs are raster surfaces of bare-earth elevation values sampled at uniform horizontal increments...
3DEP example
U.S. Geological Survey, The National Map, 2017, 3DEP products and services: The National Map, 3D Elevation Program Web page, accessed [date] at https://nationalmap.gov/3DEP/3dep_prodserv.html. Archuleta, C.M., Constance, E.W., Arundel, S.T., Lowe, A.J., Mantey, K.S., and Phillips, L.A., 2017, The National Map seamless digital elevation model...
National Elevation Dataset
The 3DEP DEMs are updated continually as new data become available.
Image of Denali using IfSAR
The standard 3DEP DEMs serve as the elevation layer of The National Map, and provide elevation information for earth science studies and mapping applications in the United States.
Example visualization of model output
Send an e-mail message to tnm_help@usgs.gov and we will add the reported information to our "Digital Elevation Model Issues" data log for further analysis and possible correction. Spikes, pits, seam-line anomalies, and other data errors or blunders are of concern to us, and we are working to correct or minimize known issues, but this will take...