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Abstract:The objective of this project was to evaluate the accuracy of light detection and ranging (LiDAR) for topographic information in
support of a transportation project for the Alaska Department of Transportation & Public Facilities (Department). In particular,
accuracy in steep terrain and varied vegetative cover was evaluated. LiDAR acquisitions in Southeast Alaska were compared to RTK
GPS survey acquisition. Comparison of the LiDAR to ground survey showed significant differences for the Ketchikan to Shelter Cove
project evaluated, this may be due to vertical datum issues, improper geoid model selection, post‐processing methods that were not
sensitive enough, inaccurate GPS readings, improperly located GPS base stations, calibration report inaccuracy, and extremely thick
vegetation canopy. By comparison, areas with less steep terrain, less dense vegetation, and better controlled LiDAR compared more
favorably to the ground survey points.
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