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Development of a LiDAR derived digital elevation model (DEM) as Input to a METRANS geographic information system (GIS).
  • Published Date:
    2011-05-01
  • Language:
    English
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Development of a LiDAR derived digital elevation model (DEM) as Input to a METRANS geographic information system (GIS).
Details:
  • Publication/ Report Number:
  • Resource Type:
  • Geographical Coverage:
  • OCLC Number:
    754647735
  • NTL Classification:
    NTL-GEOGRAPHIC INFORMATION SYSTEMS-GEOGRAPHIC INFORMATION SYSTEMS ; NTL-MARINE/WATERWAYS TRANSPORTATION-Ports ; NTL-MARINE/WATERWAYS TRANSPORTATION-Marine Planning and Policy ; NTL-HIGHWAY/ROAD TRANSPORTATION-Soils and Geology ;
  • Abstract:
    This report describes an assessment of digital elevation models (DEMs) derived from

    LiDAR data for a subset of the Ports of Los Angeles and Long Beach. A methodology

    based on Monte Carlo simulation was applied to investigate the accuracy of DEMs

    derived from the LiDAR data using different interpolation methods (inverse distance

    weighted, spline and Kriging) at different grid cell resolutions (0.25m2, and 0.50m2, 1m2

    and 2m2). Results indicate that elevation accuracy and the accuracy of a building

    feature derived from the interpolated elevations are not correlated. Inverse Distance

    Weighed at 0.25m2 resolution produced the most accurate surfaces and ranked second

    in its ability to capture the shape of the building. However, this interpolation method and

    grid cell resolution pair took the longest time to compute (over three weeks for the

    accuracy simulation). The methodology provides Port personnel and LiDAR users with

    an approach to determine an appropriate grid cell resolution and interpolation method

    for generating DEMs and extracting building features from LiDAR data. Results indicate

    that compromises between surface accuracy, shape representation and the time

    required to process the data are required.

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