NGP Standards and Specifications

Lidar Base Specification Revision Status

The 3DEP Lidar Base Specification undergoes a continuous revision and update process. Revision requests are submitted through the 3DEP Working Group (WG) and the National Geospatial Technical Operations Center. Requests are reviewed by the Elevation Specifications Review Board (ESRB). If the ESRB approves a request, it is reviewed for final approval by the 3DEP WG. 

Revisions under consideration for Lidar Base Specification 2020 rev. B:

Short name of revision Status Last updated
Restrict use of the LAS withheld bit flag Approved by ESRB Oct. 7, 2020
Maximum Surface Height Raster (MSHR) Under review by ESRB Nov. 9, 2020


Revisions included in Lidar Base Specification 2020 rev. A:

Short name of revision Status Last updated
Update LAS reference to R15 Published Aug. 28, 2020
Clarify unrestricted rights clause Published Aug. 28, 2020
Require photographs of checkpoints Published Aug. 28, 2020
Clarify class 0 and withheld flagging Published Aug. 28, 2020
Revise swath polygon requirements Published Aug. 28, 2020
Revise use of withheld flag Published Aug. 28, 2020
Vertical accuracy assessment using ground points Published Aug. 28, 2020
Swath Separation Images Published Aug. 28, 2020

Explanation about the status:

  • Under review by ESRB:
    • The revision has been through a preliminary review by the ESRB’s Technical Committee and is being reviewed by the board. Significant changes to the text of the revision should be expected throughout this stage.
  • Approved by ESRB:
    • The revision has been reviewed and approved by the ESRB and is awaiting approval by the 3DEP Working Group. Changes to the text are still likely.
  • Provisional:
    • Revision has been through the entire approval process and is approved for use.
    • Revision will be incorporated in the next release of the Lidar Base Specification.
    • The specification should be followed for current and future work, if at all possible.
  • Published: 
    • Revision has been published in the Lidar Base Specification. 
  • Tabled:
    • Revision is still under consideration but has been postponed to a later, undetermined date. This can be due to a variety of circumstances--see revision detail page for more information.


Elevation Specifications Review Board