Get Airborne and terrestrial laser scanning PDF

By George Vosselman, Hans-Gerd Maas

ISBN-10: 1628700920

ISBN-13: 9781628700923

ISBN-10: 184995013X

ISBN-13: 9781849950138

Written by means of a staff of overseas specialists, this ebook presents a complete evaluation of the foremost purposes of airborne and terrestrial laser scanning. It specializes in ideas and techniques and provides an built-in remedy of airborne and terrestrial laser scanning know-how. After attention of the expertise and processing equipment, the e-book turns to purposes, similar to engineering, forestry, cultural history, extraction of 3D construction types, and cellular mapping. This publication brings jointly many of the features of the topic in a coherent textual content that would be appropriate for complex scholars, teachers and practitioners.

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Under favourable conditions mapping can be conducted in depths up to 50 m. Compared to conventional bathymetry, the methodology offers significant savings both in operational cost and increase in productivity. For relief in low waters and complex areas the survey speed may be up to 20 times quicker than traditional soundings executed with hydrographic ships. 20 Principle of airborne lidar bathymetry. g. g. 532 nm) of the spectrum [Wozencraft and Millar, 2005]. The green laser light is refracted as it moves into the water and reflected by the seabed.

Until recently, this critical pulse frequency determined the maximum pulse rate, as airborne receivers could only handle one pulse in the air at a time. Now, new multipulse receivers are in operation which record echoes that arrive after a subsequent pulse has been emitted, which means that the laser may send pulses even while other pulses are still in the air. Compared to the past, higher pulse rates can now be used from the same survey altitude. A look at the performance parameters of current lidar systems shows that systems operating in multipulse mode send double the number of pulses as in single-pulse mode.

Using the beam propagation ratio M 2; see the definition in ISO-11146-1, 2005. 3 Photodetection Each implementation of a laser scanner requires a specific sensor to collect the laser light reflected from the scene. , 1992] and photo­ multipliers. The first two are photovoltaic detectors. Avalanche photodiodes and photo­ multipliers are characterised by an internal gain that generates excess noise that is not found with p-n photodiodes. They can also be used in the so-called photon counting mode when the collected light levels are expected to be very low.

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Airborne and terrestrial laser scanning by George Vosselman, Hans-Gerd Maas

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