FY27 DCA - Instructions for Creating 3DEP Defined Project Area and Tile Delivery Scheme 1

U.S. Geological Survey
3D National Topography Model Data Collaboration Announcement (DCA) for 3D Elevation Program (3DEP)
3DEP-B: Instructions for Creating 3DEP Defined Project Area and Tile Delivery Scheme For background information on the Defined Project Area (DPA) see the “Collection” and “Tiles” sections of the 3D Elevation Program (3DEP) Lidar Base Specification available at: https://www.usgs.gov/3dep/lidarspec
3DEP lidar data must follow a set of collection requirements to achieve a consistent national dataset. These requirements include:
1. The DPA must be the Area of Interest (AOI) plus a 100-meter buffer. 2. Data collection is required for the full extent of the DPA. 3. All products must be produced to 3DEP and Task Order requirements up to the edge of the DPA and no further.
4. Project deliverables will be delivered in the coordinate reference system(s) (CRS) and tiling scheme of the applicant’s choosing.
5. The CRS used must be registered with the European Petroleum Survey Group (EPSG). 6. Where a project area covers multiple CRS zones, USGS requires that projects be split into subareas appropriate for each zone.
7. All tile indices must be clipped to the DPA.

I.

Select Tiling Scheme and Coordinate Reference System
3DEP Data Collaboration Announcement (DCA) project deliverables will be delivered in the coordinate reference system(s) (CRS) and tiling scheme of the applicant’s choosing. The CRS must be registered with the European Petroleum Survey Group (EPSG). Where a project area covers multiple CRS zones, USGS requires that projects be split into subareas appropriate for each zone.

II.

Geoprocessing Steps
Step 1. Create the AOI using a CRS recognized and published by the EPSG. The boundary must be created in the same CRS it will be delivered in.
Each project must be processed and delivered in a single CRS, except in cases where a project area covers multiple CRSs such that processing in a single CRS would introduce unacceptable distortions in part of the project area. In such cases, the project area is to be split into subareas appropriate for each CRS.

FY27 3DEP-B: Instructions for Creating 3DEP Defined Project Area and Tile Delivery Scheme

U.S. Geological Survey
3D National Topography Model Data Collaboration Announcement (DCA) for 3D Elevation Program (3DEP)

Step 2. Buffer the AOI by 100-meters to create the DPA. The 3DEP data processing workflow requires that all project boundaries include this buffer.

Step 3. Choose or create a single non-overlapping project tiling scheme. The tiling index must be created