HOW LIDAR WORKS
LiDAR, which stands for Light Detection and Ranging, is a kind of combination of light and radar. LiDAR sends pulses of laser beams at objects far away. Tracking the distances these beams of light travel helps create accurate three-dimensional, or 3D, maps and configurations.
When scientists tried a primitive form of LiDAR in the 1930s, they just used big flashlights. Initially, they were looking for particles in the atmosphere called aerosols. In 1960, the first working laser was devised, which greatly expanded what was possible with LiDAR.
Laser light is different from the light of a flashlight. It has a narrow beam of light that can travel great distances without getting wider or weaker. Let’s say a LiDAR scanner is aimed at a bicycle a few blocks away. When the light reaches the bike, it bounces back the way it came and hits the receiver.
The amount of time it took for the light to travel roundtrip is recorded by a computer. By dividing that number by two, you know how far away the bike is—its range. But that’s not all. You can also tell how far away the handlebars, pedals, and wheels are and how they’re positioned.
Scientists from different disciplines take those many points of light and turn them into accurate 3D images.
Seismologists, or earthquake scientists, can see previously unknown fault lines. Volcanologists can watch how volcanoes breathe gas. Conservationists can find areas and trees that endangered animals call home.
