HR: 0800h
AN: G51C-0615    [Abstracts]
TI: Accuracy and Precision of Terrestrial LiDAR for Ground Deformation Monitoring
AU: * Aryal, A
EM: aryal@hawaii.edu
AF: School of Ocean & Earth Science & Technology, University of Hawaii, 1680 East-West Rd. POST#602, Honolulu, HI 96822, United States
AU: Brooks, B A
EM: bbrooks@soest.hawaii.edu
AF: School of Ocean & Earth Science & Technology, University of Hawaii, 1680 East-West Rd. POST#602, Honolulu, HI 96822, United States
AU: Foster, J H
EM: jfoster@soest.hawaii.edu
AF: School of Ocean & Earth Science & Technology, University of Hawaii, 1680 East-West Rd. POST#602, Honolulu, HI 96822, United States
AB: With controlled experiments and multiple occupations of a field site at Waimea Bay, Oahu, we are assessing the accuracy and precision for geodetic applications of the Optech ILRIS 3-D, a near-infrared (1.2 micron wavelength) Terrestrial-LiDAR (T-LiDAR) system. For the controlled experiments, we have built a stable table with a grid of peg holes and estimated static offsets and translations of a geodetic target (a Leica GPS antenna and radome). We scan the radome from variable distances (50 -1000 m) and with variable spot spacing. We use the 3D point cloud data to model the phase center of the radome by fitting all data points to a spherical model in a local co-ordinate frame. Preliminary results show that from over 1400 individual scans with spot-spacing ranging from 2 mm to 20 mm and over distances of 100-180 meters, the phase center of the radome derived from T-LiDAR measurements and solid modeling is achieved with better than 2-4 mm standard deviation. At the field site we have conducted more than 30 scans over a period of 3 months of an area with dimensions ranging from ~300 – 1000 m. While the beach face changes significantly during this time period, the area behind the beach does not allowing us to analyze the multiple natural and human-made targets there for their stability at a variety of distances and weather conditions.
DE: 1294 Instruments and techniques
SC: Geodesy [G]
MN: 2007 Fall Meeting