Lidar Base Specification: Table of Contents

Download a copy of the Lidar Base Specification 2023 rev. A online content

Revision History

• 2023 rev. A

• 2022 rev. A

• 2021 rev. A

• 2020 rev. A

• Version 2.1

• Version 2.0

• Version 1.3

• Version 1.2

• Version 1.1

Collection

• Collection Area

• Quality Level

• Multiple Discrete Returns

• Intensity Values

• Nominal Pulse Spacing

• Data Voids

• Spatial Distribution and Regularity

• Collection Conditions

Data Processing and Handling

• American Society for Photogrammetry and Remote Sensing LAS File Format

• Time of Global Positioning System Data

• Datums

• Coordinate Reference System

  • Well-Known Text

• Units of Reference

• File and Point Source Identification

• Positional Accuracy Validation

  • Absolute Horizontal Accuracy

  • Relative Vertical Accuracy

    • Intraswath Precision

    • Interswath (Overlap) Consistency

  • Check Points

  • Absolute Vertical Accuracy

• Use of the LAS Withheld Bit Flag

• Use of the LAS Overlap Bit Flag

• Point Classification

• Classification Consistency

• Tiles

• Point Duplication

Deliverables

• Metadata

• Survey Point Delivery

• Swath Separation Images

• Classified Point Data

• Bare-Earth Surface (Raster Digital Elevation Model)

• Breaklines

Digital Elevation Model Surface Treatments

• Bridges

• Hydro-Flattening

References

Tables

• Table 1: Aggregate nominal pulse spacing and density.

• Table 2: Relative vertical accuracy for light detection and ranging swath data.

• Table 3: Land cover classes.

• Table 4: Absolute vertical accuracy for light detection and ranging data and digital elevation models.

• Table 5: Minimum light detection and ranging data classification scheme.

• Table 6: Minimum digital elevation model cell size.

Figures

1. Image showing single coverage collection, no overlap.

2. Image showing designed double coverage collection, 50-percent overlap.

3. Image showing designed double coverage collection, cross-flights with 20-percent overlap.

4. Example of survey point delivery in a GeoPackage.

5. Example of a swath separation image.

Glossary

Appendix 1: Maximum Surface Height Raster 

Appendix 2: Hydro-Flattening Reference 

Appendix 3: Light Detection and Ranging Metadata Example 

Appendix 4: Light Detection and Ranging Metadata Template 

Appendix 5: Well-Known Text Coordinate Reference System Examples

Appendix 6: Supplemental Information

Appendix 7: Common Data Upgrades