NGP Standards and Specifications

Lidar Base Specification v. 2.1 Table of Contents

Table of Contents

The major headings link to pages which contain the specifications for that section. 

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Revision History

  • Version 2.1
  • Version 2.0
  • Version 1.3
  • Version 1.2
  • Version 1.0

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
  • Full Waveform
  • 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 Overage (Overlap) Bit Flag
  • Point Classification
  • Classification Consistency
  • Tiles
  • Point Duplication

Deliverables

  • Metadata
  • 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. Image showing graphic depiction of swath overlap.
  5. Image showing graphic depiction of swath overage.

Glossary

Appendix 1: Common Data Upgrades

Appendix 2: Hydro-Flattening Reference (links to LBS v. 1.3)

Appendix 3: Light Detection and Ranging Metadata Example (links to LBS v. 1.3)

Appendix 4: Light Detection and Ranging Metadata Template (links to LBS v. 1.3)