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 being considered for the Lidar Base Specification
| Short name of revision | Status | Last updated |
|---|---|---|
| Consistent units of reference | Under Review by ESRB | August 5, 2021 |
| No classification codes to identify overlap points | Under Review by ESRB | August 5, 2021 |
Revisions included in Lidar Base Specification 2021 rev. A:
| Short name of revision | Status | Last updated |
|---|---|---|
| Restrict use of the LAS withheld bit flag | Published | June 17, 2021 |
| Require LAS withheld bit flag proof of performance | Published | June 17, 2021 |
| Maximum Surface Height Raster (MSHR) (now included with proof of performance revision) | Published | June 17, 2021 |
| Lidar Mapping Report | Published | June 17, 2021 |
| Checkpoints within DPA | Published | June 17, 2021 |
| Checkpoint Photography Delivery Update | Published | June 17, 2021 |
| Swath Separation Imagery Update | Published | June 17, 2021 |
| Revise use of the Overlap Bit Flag | Published | June 17, 2021 |
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.