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Yeni Microsoft Word Belgesi - The latest in laser scanners...

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The latest in laser scanners: today's laser scanners offer even more benefits for surveyors. Article from: Point of Beginning Article date: November 1, 2006 Author: Wimbush, Mitchell More results for: 3d laser scanner METHODS Laser scanning, also known as 3D imaging, terrestrial LIDAR, high-definition scanning and 3D laser scanning, is becoming less of a specialized service and more a part of everyday surveying. Part of the reason behind the growing acceptance of this technology is that today's laser scanners, to borrow from some of the manufacturers' taglines, are "friendly" and "think like surveyors." [ILLUSTRATION OMITTED] Laser scanners are most often used for as-built or topographic surveys. Typically, laser scanners are not used for boundary surveys except in urban areas or for ALTA/ACSM land title surveys. The inclusion of laser scanners in the 2005 ALTA/ACSM minimum standard requirements for locating certain features on a parcel of land shows just how accepted laser scanners have become within the surveying community. In the past, laser scanner manufacturers tried to offer surveying-like features to make their scanners appear to be surveyor-friendly, but it is only in the last twelve months that the line between surveying and scanning has grown very thin. Benefits of Modern Scanners Each new generation of laser scanners comes with new features geared toward surveyors. For those surveyors trying to use a laser scanner on everyday surveying projects, the biggest improvement in scanning technology is the addition of survey-grade dual-axis compensators, which correct for errors in the vertical and horizontal angles due to deviation of the vertical axis. Both the Leica Geosystems HDS (San Ramon, Calif.) ScanStation and the Trimble (Sunnyvale, Calif.) GX 3D scanner offer hardware with survey-grade dual-axis compensators. Among the advantages that this new technology brings to the laser scanning workflow are the following four benefits: reduced target numbers, reduced labor, increased productivity and reduced scanner drift. [ILLUSTRATION OMITTED] [ILLUSTRATION OMITTED] Reduced Targets
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When performing laser scanning services at my firm, Midwestern Consulting of Ann Arbor, Mich., our typical procedure requires four targets spread apart in the scanner 's field of view to ensure an accurate post-processed alignment (or registration) of the point clouds. Sometimes it seems like more of an art than a science to place targets in the optimal positions to attain the most accurate data. Using four targets per scan can require significant pre-project planning, as well as a considerable amount of time in the field to set them up. Relocating
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