What is LiDAR? How does it work?

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Emre AKDENİZ
Founder & Managing Director / One of your colleague who loves research new technologies and mostly addicted to sharing 🙂

“LiDAR” is basically a remote sensing method that uses laser or light for measuring. In the mapping industry, although complex objects or areas cannot be measured, it is very much involved in classical construction stages. On the other hand, while using this method in autonomous driverless vehicles, which is one of the trends of today’s technology, they can act in a controlled manner with a kind of laser eye by performing instant data generation and analysis.

LIDAR system, which stands for “Light Detection and Ranging”, means that it sends out a light signal and waits for the signal to return. It locates by determining how long the emitted light returns to the sensor. It transforms their positioning into point clouds of millions of points.

 

There are 4 parts of LiDAR in the air.
-LiDAR sensors scan the ground from one side to another when the aircraft is flying.
-The sensor has a detector to detect rotations from objects.
-GPS receivers track the altitude and location of the aircraft during the flight.

-These variables are important to obtain accurate terrain elevation values.
Inertia measurement units (IMUs) monitor the aircraft flying in flight.
The computers record all altitude information when scanning the “LiDAR” surface.

These 4 parts of a LiDAR system work together to produce highly accurate, usable results. There are two kinds of LiDAR depending on the surface being measured.

  • Topographic LiDAR; Usually maps the terrain using infrared light.
  • Bathymetric LiDAR; It uses green light that penetrates water to measure seabed and river bed heights.

Airplanes and helicopters are the most widely used platforms for obtaining LiDAR data over large areas.

 

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