ALPS

摘要

This month we present a Product Survey on Airborne Lidar Processing Software (ALPS), see page 14, so I shall here touch briefly on operations typically performed on Lidar data. Basically, all Lidar scanners measure range and intensity of terrain points hit by the laser pulse, and corresponding platform positional and orientation parameters. The first task is to convert the raw data into positions - three coordinates for each point - in a geodetic reference system. The resulting point-cloud is the basis for further processing, including filtering, visualisation, classification and analysis, or other manipulation.