NGP Standards and Specifications

Elevation Specification Resources

A variety of resources supporting the acquisition, processing, validation, and publication of 3DEP elevation data are available through these Elevation Specification Resources pages. This includes Lidar Base Specification suporting and background information, the Lidar Error Dictionary, the Spatial Metadata Data Dictionary, and other explanatory information. 

Lidar Error Dictionary

Lidar Error Dictionary

The purpose of this dictionary is to provide standardized language to describe commonly encountered errors associated with lidar datasets submitted to the USGS data validation unit for ingestion into the National Map. 

Error Dictionary

3DEP Spatial Metadata

3DEP Spatial Metadata

Spatial metadata for the 3D Elevation Program (3DEP) is now published and available by work unit in the Work unit Extent Spatial Metadata (WESM) geopackage. 

Spatial Metadata