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Rein in 3D Point Clouds with the LAS Format

Wednesday, November 2nd 2011
by ERDAS
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The advent of LiDAR sensors has been valuable for the geospatial industry, but there have been some challenges as the community attempts to fully leverage the technology. As you may already know, LiDAR is similar to radar in that both direct an active signal towards the surface of interest and receive a return signal reflected from the surface and objects on it. The time delay of this reflection is used to calculate range from the sensor to the surface. With radar, this results in formation of an “image” with intensities proportional to the reflectivity of the surface at radar wavelengths, which are in the microwave or radio range. In contrast, LiDAR processing is used along with sensor position information to determine the elevation of the surface at each reflection point, or the distance from an established reference plane in the case of terrestrial LIDAR.

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