By George Vosselman, Hans-Gerd Maas
Written via a staff of foreign specialists, this booklet presents a complete evaluation of the main purposes of airborne and terrestrial laser scanning. It specializes in ideas and strategies and provides an built-in therapy of airborne and terrestrial laser scanning know-how. After attention of the expertise and processing tools, the ebook turns to functions, reminiscent of engineering, forestry, cultural historical past, extraction of 3D development versions, and cellular mapping. This ebook brings jointly a few of the features of the topic in a coherent textual content that might be suitable for complex scholars, lecturers and practitioners.
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Additional resources for Airborne and terrestrial laser scanning
Seen from the economic point of view, the aim is to find the largest scan angle at which the project requirements are still met. In flat terrain, larger scan angles may be the best choice. In urban areas or in the presence of dense vegetation (forest), shadowing effects must be taken into account. Therefore, smaller scan angles should be chosen here. Bearing in mind the IMU drift characteristics, the maximum length of a flight line will typically be 30 to 40 km (depending on the chosen cruising speed).
The following might serve as a general outline of phases within an airborne laser scanning project. In principle, each project can be divided into three phases: • • • flight planning; a survey campaign which includes the survey flight, the operation of GPS ground station(s) and the collection of ground reference data; data processing and quality control. 1 Flight planning The project requirements in terms of point density and characteristics of the project area (extension, location and topography) form the basis for planning of the survey flight.
2005]. 5 Scanning/projection mechanisms The acquisition of a densely sampled 3D surface with a single laser beam requires a scanning mechanism to move the laser beam over the surface of the object. Some basic scanning modes can be distinguished: • • • • • Scanning is performed by two mirrors mounted orthogonally. This is typical for terrestrial scanners with a window-like field of view. The laser beam is scanned in one direction with a scanning mirror and the device assembly is rotated with a mechanical stage.
Airborne and terrestrial laser scanning by George Vosselman, Hans-Gerd Maas