By George Vosselman, Hans-Gerd Maas
Written by way of a crew of foreign specialists, this booklet presents a complete evaluation of the most important purposes of airborne and terrestrial laser scanning. It makes a speciality of ideas and techniques and provides an built-in therapy of airborne and terrestrial laser scanning expertise. After attention of the know-how and processing equipment, the ebook turns to functions, corresponding to engineering, forestry, cultural history, extraction of 3D construction versions, and cellular mapping. This booklet brings jointly some of the aspects of the topic in a coherent textual content that might be appropriate for complicated scholars, teachers and practitioners.
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Additional info for Airborne and terrestrial laser scanning
With increasing PRF, the laser spot density on the ground also increased. The pulse repetition frequencies of current airborne laser scanners reach up to 300 kHz. The mean point density PM on the ground can be calculated as follows. 20) The number of laser pulses P generated during a certain time interval t is P = PRF × t. 21) 1/8/2010 8:27:51 PM Laser Scanning Technology 27 So, the highest point density is reached with high pulse repetition frequencies, low cruising speed v, low survey height h and small scan angle θ.
Operator laptop: this serves as a means of communications with the control and data recording unit, to set up mission parameters, and to monitor the system’s performance during the survey. Flight management system: this is a means for the pilot to display the preplanned flight lines, which provides support for him in completing the mission. An airborne laser scanner is completed by a GPS ground station. The ground station serves as a reference station for off-line differential GPS (DGPS) calculation.
In general, the light produced by lasers (light amplification by stimulated emission of radiation) is far more monochromatic, directional, bright and spatially coherent than that from any other light sources. Spatial coherence allows the laser beam to stay in focus when projected on a surface. The coherence length is given by the speed of light c divided by the spectral width of the laser source (a function of its spectral purity). Unfortunately, the high spatial coherence means that speckle is produced when a rough surface is illuminated with a coherent laser source.