Laser remote sensing or LIDAR, an acronym for "light detection and ranging", is a remote sensing technology or optical measurement based on the analysis of the properties of laser light reflected back to the transmitter.

Principles of the method of laser scanning

Sending a laser beam to measure the distance to perform the surface of the Earth. At the same time, it saves the position of the beam using the differential GPS and inertial navigation. By evaluation of all parameters, information is obtained on one of the defined points on the surface. In the case of aerial mapping, the support of the whole of the laser device is often an airplane or helicopter.

The primary output of the laser scanning is a file of 3D coordinate points called points cloud. With automated, semi-automatic and manual processes, classification of these points is made in the following treatment. The final output of processed data of laser scanning can be for example a terrain model or surface highly detailed model of triangular form, possibly a 3D vector model extrapolated.

Their application are found in urban information systems and GIS, and in the operating system for industrial services (online networks: gas, water, communications, electricity, telecommunications).

Advantages of laser scanning  :

  • high density of measurement data in a short time
  • possibility to use even during low visibility
  • accuracy of data obtained


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