Definition
LiDAR, short for Light Detection and Ranging, is a technology that measures distance by sending out laser pulses and timing how long they take to bounce back. By doing this millions of times, it builds an accurate 3D picture of surfaces and environments.
Because it directly measures distance with light, LiDAR produces precise point clouds even over large or complex areas. It can be mounted on the ground, on vehicles, or on aircraft and drones.
In simple terms, LiDAR uses laser pulses to measure the world in 3D, quickly and accurately.
How It Works
A LiDAR sensor emits rapid laser pulses toward its surroundings and detects the light that returns. By measuring the time each pulse takes to come back, it calculates the exact distance to whatever it hit, and combined with the direction of the pulse, it fixes each point in 3D space.
Repeating this millions of times per second produces a dense point cloud. Airborne LiDAR can even capture ground beneath vegetation, as some pulses pass through gaps in foliage, making it valuable for terrain mapping.
Applications
LiDAR is used in surveying, mapping, autonomous vehicles, forestry, and construction. It creates terrain and city models, guides self-driving cars, measures forest structure, and captures as-built conditions, serving as a core technology across reality capture and geospatial work.
Benefits
- Accurate, direct distance measurement.
- Dense 3D point clouds at high speed.
- Works in low light and can penetrate vegetation.
- Flexible deployment on ground, vehicles, and aircraft.
- A foundation for mapping and autonomy.
Related Terms
- Terrestrial Laser Scanning (TLS)
- Point Cloud
- Laser Scanning
- Time-of-Flight
Frequently Asked Questions
What is LiDAR used for?
It is used for surveying, terrain and city mapping, autonomous vehicles, forestry, and construction, among many other applications.
How does LiDAR work?
It sends out laser pulses and measures how long they take to return, calculating distances to build a 3D point cloud.
What is the difference between LiDAR and photogrammetry?
LiDAR measures distance directly with lasers, while photogrammetry derives 3D data from photos. LiDAR often performs better in low light and through vegetation.
Can LiDAR see through trees?
Airborne LiDAR can capture the ground beneath vegetation because some pulses pass through gaps in the foliage.
About Track3D
Track3D helps teams turn LiDAR data into accurate digital twins and reality capture insights. Learn more at Track3D.
