The 3DEP products and services available through The National Map consist of standard digital elevation models (DEMs) at various horizontal resolutions, elevation source (lidar) and associated datasets, and web applications and visualization services. Products of the 3D Elevation Program are built upon the most current applicable standards for geospatial data.
3DEP Standards and Specifications
Products of the 3D Elevation Program are built upon the most current applicable standards for geospatial data.
3DEP Spatial Metadata
The Work unit Extent Spatial Metadata is a good source of information for current lidar data availability and basic information about lidar projects.
Topographic Data Quality Levels
The concept of topographic quality levels (QLs) was originally defined in the National Enhanced Elevation Assessment report by Dewberry and further defined in the 3DEP Lidar Base Specification (LBS).