AIRBORNE LIDAR TOPOGRAPHICAL SURVEYING.

In generally are many methods and tools that can be used to collect some terrestrial measurement elements like ELEVATION. Are 2 basics types of LIDAR systems, those used for topography and those used for bathymetry. A LIDAR device mounted in an airborne platform emits fast pulses from a focused infrared laser which are beamed toward the ground across the flight path by a scanning mirror. While in flight, the system gathers information on a massive base of scattering ground points and stores them in digital format. LIDAR mapping systems are capable of rapid and accurate collection of topographic and elevation data without having a set out panel points or large control networks. LIDAR sensors can only collect during cloud coverage if the clouds are above the height of the airborne platform. LIDAR sensors can only collect data in reasonably good weather and cannot collect data in rain, fog, smoke, or snowstorms. [ABSTRACT FROM AUTHOR]