By George Vosselman, Hans-Gerd Maas
Written by means of a crew of overseas specialists, this publication presents a complete assessment of the foremost purposes of airborne and terrestrial laser scanning. It specializes in rules and strategies and offers an built-in therapy of airborne and terrestrial laser scanning know-how. After attention of the know-how and processing equipment, the e-book turns to functions, corresponding to engineering, forestry, cultural history, extraction of 3D development types, and cellular mapping. This ebook brings jointly a number of the elements of the topic in a coherent textual content that might be correct for complex scholars, lecturers and practitioners.
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Extra info for Airborne and terrestrial laser scanning
Projection of multiple lines or strip patterns enables full-field techniques without the necessity of scanning. , 2006]. Such systems are based on a floodlight device projecting light on the area of interest and a bi-dimensional device capturing time-of-flight data. They are often reported as flash LADAR (light detecting and ranging) or focal plane time-of-flight systems. 10 shows a number of different scan mechanisms which are in use in airborne and/or terrestrial laser scanners. Oscillating mirror: Many commercial airborne systems utilise the oscillating mirror technique, in which a swivelling mirror directs the laser pulse across the swath.
2006]. Such systems are based on a floodlight device projecting light on the area of interest and a bi-dimensional device capturing time-of-flight data. They are often reported as flash LADAR (light detecting and ranging) or focal plane time-of-flight systems. 10 shows a number of different scan mechanisms which are in use in airborne and/or terrestrial laser scanners. Oscillating mirror: Many commercial airborne systems utilise the oscillating mirror technique, in which a swivelling mirror directs the laser pulse across the swath.
14). Airborne scanners allow scan angles between about 5° and 75°. For example, the swath width will be 574 m at a height of 1000 m and a scan angle of 32°. The laser beam widens with the distance from the laser scanner. 14). 1 mrad and 1 mrad. 2 mrad. The laser beam profile does not have sharp edges, but the irradiance falls off gradually away from the centre of the beam. 2). 5 Pulse repetition frequency and point density In the 1990s most airborne lidar systems were characterised by pulse repetition frequencies (PRF) in the low kilohertz range.
Airborne and terrestrial laser scanning by George Vosselman, Hans-Gerd Maas