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• W2022007013 abstract "ABSTRACT Mobile laser scanning is an emerging technology for accurat e and fast surveying and surve illance applications. By using RIEGL ’s new V-line laser scanners with online waveform analysis capable of discriminating multiple targets per laser shot, true 3D information can be obtaine d. Thus the detection of objects concealed by vegetation or camouflage tarps is facilitated. We present experimental results disclosing a vehicle hidden behind bushes employing a terrestrial laser scanning system. The laser scanner offers measurement rates of up to 125 kHz and ranging capabilities up to 500 m at a scan range of 360° for the frame and 100° for the line axis. The obtained experimental results prove that multi-target capability is mandatory for the envisaged application. In dense vegetation, up to 10 targets per laser shot are identified. Keywords: Mobile laser scanning, echo digitization, on line waveform processing, multi-target detection 1. INTRODUCTION Mobile laser scanning is an important sector of terrestrial GIS-data acquisition. Being used increasingly for surveying urban environments, it has also high potential in rural areas for surveying, forest mapping, or surveillance applications. Scanning from moving platforms is exceptionally demanding with respect to scanning speed, measurement rate, and ranging capabilities. High performance of the laser scanner allows going faster while maintaining the spatial measurement density (i.e. points per square meter) required for the application. This reduces costs and increases safety when moving in road traffic. The advantages of employing 3D laser scanners alone or in combination with 2D laser scanners on mobile platforms with respect to system calibration and data acquisition capabilities have been recently reported [1]. The main focus of this paper is laid on the performance of the 3D laser scanner under adverse target situations, i.e., the capability of scanning objects obscured by dense vegetation. The possibility of vegetation penetration might, however, not only be of interest for object recognition or remote sensing but also for mobile street mapping in the presence of alley trees or other vegetation obscuring the objects of interest. This paper is organized as follows: In section 2 the measurement principle of the employed instrument is introduced. Examples for scan results are presented in order to interpret the data provided by the laser scanner. In section 3 on-line calibrated amplitudes and the new concept of reflectance-scaled visualization of 3D point clouds are presented. Results of a measurement campaign unveiling an obscured vehicle by pe rforming a mobile stop-and-go scan in a forest scenario are examined in section 4 and in section 5 we draw some conclusions of the presented work." @default.
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• W2022007013 date "2009-05-01" @default.
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• W2022007013 title "Detection of concealed objects with a mobile laser scanning system" @default.
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• W2022007013 doi "https://doi.org/10.1117/12.828293" @default.
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