Airborne and terrestrial laser scanning by George Vosselman, Hans-Gerd Maas PDF
By George Vosselman, Hans-Gerd Maas
Written by way of a workforce of overseas specialists, this e-book offers a accomplished evaluate of the main purposes of airborne and terrestrial laser scanning. It specializes in rules and techniques and provides an built-in remedy of airborne and terrestrial laser scanning expertise. After attention of the know-how and processing equipment, the e-book turns to functions, comparable to engineering, forestry, cultural background, extraction of 3D construction types, and cellular mapping. This e-book brings jointly a number of the aspects of the topic in a coherent textual content that might be proper for complicated scholars, lecturers and practitioners.
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Additional info for Airborne and terrestrial laser scanning
This is typical for terrestrial scanners with a panoramic or hemispheric field of view. g. , 2000]. The laser beam is scanned in one direction and mounted in an aircraft or on a vehicle. In this case the second scanning direction is provided by aircraft or vehicle motion, and a GPS (global positioning system)/IMU (inertial measurement unit) combined unit is used to measure the position and orientation of the platform. In the case of triangulation scanners, a line may be projected rather than a single spot.
GPS data are processed by differential GPS methods to get precise information on positions for the whole survey flight. So, for example, a cruising speed of 70 m/s and a 2 Hz GPS recording rate result in a spacing of 35 m at which positions are available. For complete restitution of the flight trajectory an IMU is needed which provides position data as well as roll, pitch and yaw angles of the survey platform, typically at a 200 Hz sampling rate. As IMU systems suffer from systematic drift effects, IMU data may not be used over a longer period of time without losing accuracy.
Of course, lasers scanners may also be operated simultaneously with a large format digital camera. 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.
Airborne and terrestrial laser scanning by George Vosselman, Hans-Gerd Maas