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Lidar Base Specification Appendix 7: Common Data Upgrades

By NGP Standards and Specifications

This appendix contains a partial list of common upgrades, which is neither comprehensive nor exclusive.

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Common Data Upgrades

  • Independent third-party quality assurance/quality control by another contractor.
  • Full Waveform collection and delivery.
  • Additional Environmental Constraints.
    • Tidal coordination, flood stages, crop or plant growth cycles.
    • Shorelines corrected for tidal variations within a collection.
  • Top-of-Canopy (First Return) Raster Surface (tiled).
    • Raster representing the highest return within each cell is preferred.
  • Intensity Images (8-bit grayscale, tiled).
    • Interpolation based on First Returns.
    • Interpolation based on All-Returns, summed.
  • Detailed Classification (additional classes).
    • Class 3: Low vegetation.
    • Class 4: Medium Vegetation (use for single vegetation class).
    • Class 5: High Vegetation.
    • Class 6: Buildings, other man-made structures.
    • Class n: Additional classes or features as agreed upon in advance.
  • Hydro-enforced digital elevation models (DEMs) as an additional deliverable.
  • Hydro-conditioned DEMs as an additional deliverable.
  • Breaklines (PolylineZ and PolygonZ) for additional hydrographic and topographic features.
    • Narrower double-line streams and rivers.
    • Single-line streams and rivers.
    • Smaller ponds.
    • Culverts and other drainage structures.
    • Retaining walls.
    • Hydrologic areas (for example, swamp or marsh).
    • Appropriate integration of additional features into delivered DEMs.
  • Extracted Buildings (PolygonZ).
    • Footprints with maximum elevation or height above ground as an attribute.
  • Other products as defined by requirements and agreed upon before a funding commitment.