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Calibration of full-waveform airborne laser scanning data for object classification

Proc. SPIE, Vol. 6950, 69500H (2008); DOI:10.1117/12.781086

Online Publication Date: 16 April 2008

Conference Date: Wednesday 19 March 2008
Conference Location: Orlando, FL, USA
Conference Title: Laser Radar Technology and Applications XIII
Conference Chairs: Monte D. Turner, Gary W. Kamerman
Christian Briese, Bernhard Höfle, Hubert Lehner, and Wolfgang Wagner
Vienna Univ. of Technology (Austria)

Martin Pfennigbauer and Andreas Ullrich
RIEGL Laser Measurement Systems GmbH (Austria)
Small-footprint airborne laser scanners with waveform-digitizing capabilities are becoming increasingly available. Waveform-digitizing laser scanners seize the physical measurement process in its entire complexity. This leads the way to the possibility of deriving the backscatter cross section which is a measure of the electromagnetic energy intercepted and reradiated by objects. The cross section can be obtained by firstly decomposing the echo waveform in several distinct echoes, whereas for each echo its range, amplitude and width are known. Then the radar equation can be used for calibrating the waveform measurements using external reference targets with known backscatter cross sections. The final outcome is a 3D point cloud where each point represents one scatterer with a given cross section and echo width. Using these physical attributes and various geometric criteria the point cloud can be segmented or classified. In this paper this procedure is demonstrated based on waveform measurements acquired by the RIEGL LMS-Q560 sensor. The cross section of the homogenous reference targets is estimated with a RIEGL reflectometer and Spectralon® targets.

©2008 COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
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