3D Elevation Program (3DEP)
Overview
3D Elevation Program (3DEP) is an initiative led by the USGS to provide high-resolution, three-dimensional elevation data for the entire United States. 3DEP aims to complete nationwide coverage with quality level 2 (QL2) LiDAR or better.
Key Concepts
Quality Level (QL) defines data specifications (point density, accuracy). QL2 is 2+ points/m² with 10cm vertical accuracy (standard target). QL1 is 8+ points/m² for higher resolution needs. QL0 is special high-density collection (urban, corridors). Bare Earth DEM is the gridded surface derived from LiDAR points. Point cloud is the original LiDAR returns with classification.
Quality Levels
| Level | Point Density | Vertical Accuracy |
|---|---|---|
| QL0 | ≥8 pts/m² | ≤5 cm |
| QL1 | ≥8 pts/m² | ≤10 cm |
| QL2 | ≥2 pts/m² | ≤10 cm |
Data Access
- The National Map (USGS)
- USGS LiDAR Explorer
- AWS Open Data (via Entwine)
- Google Earth Engine
Appendix
Created: 2025-12-13 | Modified: 2025-12-13
See Also
- United States Geological Survey (USGS)
- Light Detection and Ranging (LIDAR)
- Digital Elevation Model (DEM)