FY27_DCA_3DEP-E_-3DEP_Data_Validation_Timeline_1.pdf
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This document is an estimated timeline guideline for the U.S. Geological Survey's 3D Elevation Program (3DEP) data validation process following data delivery by data providers.
The USGS processes 3DEP data in work units, which are smaller blocks of larger projects often delivered in staggered deliveries. Upon receipt, each work unit undergoes format verification followed by an initial review lasting up to 90 days. If corrections are needed, data providers have 60 days to submit corrected deliverables, and the USGS requires 30 days to review corrections. This correction cycle may repeat if additional revisions are necessary. Once a work unit is validated, the lidar point cloud (LPC) and source digital elevation model (sDEM) are published on The National Map within 60 days. Individual work units are not considered fully accepted until all project work units complete validation and final vertical accuracy verification, which takes up to 10 days following the last work unit publication. The USGS then generates and publishes 1-meter DEM and seamless products within 60 days of the final work unit publication. The document emphasizes that actual timelines may vary and includes a visual timeline example depicting a project with three staggered deliveries comprising five work units, illustrating how data flows from delivery through validation to final publication on The National Map.
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U.S. Geological Survey 3D National Topography Model (3DNTM) Data Collaboration Announcement (DCA) for 3D Elevation
Program (3DEP)
FY26 3DEP-E: Estimated Timeline for 3DEP Data Validation Page 1
3DEP-E: Estimated Timeline for 3DEP Data Validation
The following is an estimated timeline of the data validation process after data is delivered to the USGS. This document is a guideline only and actual dates may vary.
Larger projects may be broken into smaller blocks each known as a “work unit”. These work units are delivered to USGS by the data provider often in staggered deliveries with one or more work units in each delivery. Some projects may be small enough to be delivered as one work unit. The USGS reviews each work unit individually.
After a work unit is delivered to the USGS it is assessed to ensure the data were delivered in the proper format. Following confirmation of proper data formatting, the validation process will begin. The initial review process can take up to ninety (90) days after the work unit is delivered to USGS. Feedback is submitted to the USGS point of contact who communicates it back to the partner and/or data provider. Data providers have sixty (60) days to provide data corrections if requested. USGS has thirty (30) days to complete the review of the corrected deliverables. If the data still require corrections after evaluation, the correction cycle may be repeated.
As soon as a work unit has been validated, the lidar point cloud (LPC) and source digital elevation model (DEM) are ready for publication on The National Map. The goal is to publish the LPC and the source DEM (sDEM) for a work unit within sixty (60) days of validation. This process of validation and publication is repeated for each work unit that comprises the entire project. While the individual work unit level data will be available on The National Map, the individual work unit will not be considered fully accepted and validated until all work units for the entire project have been validated and the final vertical accuracy has been verified. The vertical accuracy assessment may take up to ten (10) days after the final work unit publication.
The USGS 1-meter DEM and seamless products will be generated and published on The
National Map within sixty (60) days of the last work unit publication.
https://www.usgs.gov/media/images/work-unit-and-project https://www.usgs.gov/media/images/work-unit-and-project
U.S. Geological Survey 3D National Topography Model (3DNTM) Data Collaboration Announcement (DCA) for 3D Elevation
Program (3DEP)
FY26 3DEP-E: Estimated Timeline for 3DEP Data Validation Page 2
Delivery
Work Unit
Initial
Review 90 days
Corrections
Requested 60 days
Review
Corrections 30 days
Corrections
Requested 60 days
Review
Corrections 30 days
LPC & sDEM
Publication 60 days (Goal)
Final Vertical
Accuracy
Check within 10 days of last work unit acceptance.1-meter DEM and seamless products generated within 60 days of last work unit publication
All Data
Published on The
National
Map
Work Unit
Initial
Review 90 days
Corrections
Requested 60 days
Review
Corrections 30 days
Corrections
Requested 60 days
Review
Corrections 30 days
LPC & sDEM
Publication 60 days (Goal)
Delivery 2 Work Unit
Initial
Review 90 days
Corrections
Requested 60 days
Review
Corrections 30 days
LPC & sDEM
Publication 60 days (Goal)
Delivery 3
Work Unit 4
Initial
Review 90 days
LPC & sDEM
Work Unit 5
Initial
Review 90 days
Corrections
Requested 60 days
Review
Corrections 30 days
LPC & sDEM
Color Key USGS - Data Validation Data Provider USGS - Data Publication Full Project Completion
Figure 1: Estimated timeline of a project from delivery to the USGS through publication on The
National Map. This example has 3 staggered deliveries broken up into 5 work units. Data may go through a series of correction cycles before validation is complete. The lidar point cloud and the source DEMs are published on The National Map as soon as the work unit is validated. The vertical accuracy check is done on the entire project after the final work unit has been validated. The 1-meter DEM and seamless products are generated after the vertical accuracy is checked. This is an example for illustration purposes only and actual time for a project to be validated and published on The National Map may vary.
Data PublicationTimeData Delivery
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