By George Vosselman, Hans-Gerd Maas
Written by way of a workforce of foreign specialists, this publication offers a accomplished assessment of the key purposes of airborne and terrestrial laser scanning. It specializes in ideas and techniques and provides an built-in therapy of airborne and terrestrial laser scanning know-how. After attention of the expertise and processing equipment, the booklet turns to purposes, comparable to engineering, forestry, cultural history, extraction of 3D construction versions, and cellular mapping. This ebook brings jointly a number of the features of the topic in a coherent textual content that would be suitable for complex scholars, lecturers and practitioners.
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However, there are some restrictions which have to be taken into account. • • Accommodation: Operating a large format digital camera and a laser scanning system simultaneously needs an aircraft with two holes in the fuselage. High weight and power consumption might need use of a large (and thus more expensive) aircraft. Survey height: It has to be taken into account that large format digital cameras have a fixed field of view (FOV), which means that a certain survey height stands for a certain ground sampling distance and swath width.
5) combined with a horizontal 360° rotation of the whole instrument. 21) allows generation of a field of view which is basically only limited by self-occlusions of the instrument itself and its tripod. 1 discussed the advantages and disadvantages of different range measurement principles: direct time-of-flight measurement delivers a larger range capacity, while phase-measurement based CW systems provide better accuracy and a higher data rate. Time-of-flight measurement is clearly dominant in airborne laser scanner systems, which are usually employed at flying altitudes between 200 m and 4000 m.
G. snow in the visible wavelength range). A return echo coming from a low reflecting target will have a lower amplitude compared to that from a high reflecting target. Due to this fact, simple pulse detectors in time-of-flight systems tend to put out longer ranges for low reflecting targets. As a consequence, for instance, white markings on a dark asphalt runway will hover above the runway in a range image if this effect is not corrected. Correction may be done with help of tables providing time (= range) corrections for low reflecting targets or by the use of constant-fraction detection techniques.
Airborne and terrestrial laser scanning by George Vosselman, Hans-Gerd Maas