Resolution and Accuracy of an Airborne Scanning Laser System for Beach Surveys
| Autor: | C. G. Cooke, Greg J. Nippard, Peter Mumford, Chris Rizos, Kristen D. Splinter, Jason H. Middleton, Edward T. Kearney, Ian L. Turner, M. A. Mole |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Journal of Atmospheric and Oceanic Technology. 30:2452-2464 |
| ISSN: | 1520-0426 0739-0572 |
| DOI: | 10.1175/jtech-d-12-00174.1 |
| Popis: | Airborne scanning laser technology provides an effective method to systematically survey surface topography and changes in that topography with time. In this paper, the authors describe the capability of a rapid-response lidar system in which airborne observations are utilized to describe results from a set of surveys of Narrabeen–Collaroy Beach, Sydney, New South Wales, Australia, over a short period of time during which significant erosion and deposition of the subaerial beach occurred. The airborne lidar data were obtained using a Riegl Q240i lidar coupled with a NovAtel SPAN-CPT integrated Global Navigation Satellite System (GNSS) and inertial unit and flown at various altitudes. A set of the airborne lidar data is compared with ground-truth data acquired from the beach using a GNSS/real-time kinematic (RTK) system mounted on an all-terrain vehicle. The comparison shows consistency between systems, with the airborne lidar data being less than 0.02 m different from the ground-truth data when four surveys are undertaken, provided a method of removing outliers—developed here and designated as “weaving”—is used. The combination of airborne lidar data with ground-truth data provides an excellent method of obtaining high-quality topographic data. Using the results from this analysis, it is shown that airborne lidar data alone produce results that can be used for ongoing large-scale surveys of beaches with reliable accuracy, and that the enhanced accuracy resulting from multiple airborne surveys can be assessed quantitatively. |
| Databáze: | OpenAIRE |
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