With properly designed LIDAR control, assessment of 3D as-builts is attainable with an average over-all horizontal (planimetric) error of 0.324 ft (9.9 cm). Specifically, with an RMS error of 0.284 ft (8.7 cm) in Northing, and 0.255 ft (7.8 cm) in Easting. The average over-all vertical (height) error is 0.003 ft (0.1 cm) with a 0.108 ft (3.3 cm) RMS error. Lidar recognizable control (2m x 2m chevrons) was spaced at approximately 200m parallel to the direction of the axis of the project corridor, and at 60m sideway intervals. The project corridor was about 6 km long. Least Squares Image matching software was developed. The internal accuracy proved to be 0.027 ft (8mm). The strip width was approximately 111m and overlap between the Lidar strips changes from 55 to 90m sideways. Each flight line was flown twice in opposite directions showing 55 % overlap in two strips and 75 % in other two. The overall conclusion about the usage of Lidar aerial surveys for corridor mapping projects is that this technique is an efficient, cost cutting alternative to classical terrestrial and aerial survey techniques. However, at this point of the research it is felt that that the design of the LiDAR control plays a critical role to the success of the deployment of aerial LiDAR surveys. Augmentation of ground-based LiDAR and classical surveys proves necessary because of shielding of the airborne laser signals (e.g. underpasses). Comparison of the Lidar based model against the photogrammetric model obtained from low flying aerial photography (helicopter) should be made once the latter model becomes available

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airborne LIDAR, accuracy assessment, edge of pavement feature extraction, evaluation, SPR-2851

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Performing Organization

Joint Transportation Research Program

Publisher Place

West Lafayette, IN

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