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3D Elevation Program (3DEP)

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3DEP National Indexing Scheme

3DEP acquires high-resolution elevation data for the Nation. This program has been operating under an opportunity-oriented approach, acquiring lidar projects of varying sizes scattered across the United States. As a result, the national 3DEP elevation layer is subject to data gaps or unnecessary overlap between adjacent collections. To mitigate this problem, 3DEP is adopting a strategic, systematic approach to national data acquisition that will create efficiencies in efforts to achieve nationwide elevation data coverage and help capture additional Federal and non-Federal investments resulting from advance awareness of proposed acquisitions and partnership opportunities. The 3DEP Working Group, an interagency group managed by the USGS, has agreed that all future 3DEP collections within the lower 48 States should be coordinated by using a 1-kilometer by 1-kilometer tiling scheme for the conterminous United States. Fiscal Year 2018 is being considered a transition year, and in Fiscal Year 2019 the national indexing scheme will be fully implemented, so that all 3DEP-supported projects will be acquired and delivered in the national indexing scheme and projected into the Albers Equal Area projection.

Data Access:

The 3DEP National Indexing Scheme is available as a map service.

The 3DEP National Indexing Scheme is also available for download as a File Geodatabase, a Shapefile, or a GeoPackage on an FTP site.

The 3D Elevation Program National Indexing Scheme fact sheet:


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Page Last Modified: Friday, 02-Feb-2018 11:45:47 EST