What LiDAR is
LiDAR is a method of measuring distances by illuminating a target with laser light and measuring the reflection. The name comes from combining 'light' with 'radar,' reflecting that it works much like radar but uses light instead of radio waves. By sending out laser pulses and timing how long they take to bounce back, LiDAR can determine how far away objects are and build a detailed picture of its surroundings.
How LiDAR works
A LiDAR system sends out pulses of laser light and measures the time it takes for each pulse to reflect off a surface and return. Since light travels at a known speed, this timing reveals the distance to the point that reflected the pulse. By rapidly scanning many points in different directions, the system collects a large set of distance measurements that together describe the shapes and positions of objects around it.
Building a 3D picture
The many distance measurements a LiDAR system gathers can be combined into a detailed three-dimensional representation of an environment, often called a point cloud. Each measured point marks a spot on a surface, and together the points form a model of the scene. This ability to capture the precise shape and layout of surroundings is what makes LiDAR so valuable for mapping and sensing applications.
Where LiDAR is used
LiDAR is used in a wide range of fields. It helps create accurate maps and surveys of land and structures, and it is used in vehicles and robotics to sense obstacles and navigate. Some smartphones and tablets include small LiDAR sensors to improve depth sensing for photography and augmented reality. Its ability to measure the world in three dimensions makes it useful wherever precise spatial information is needed.
LiDAR and radar compared
LiDAR is conceptually similar to radar, but it uses light instead of radio waves. Because light has a much shorter wavelength than radio, LiDAR can capture finer detail and produce more precise measurements of shape and distance. Radar, in turn, has its own strengths in certain conditions. Understanding that LiDAR is the light-based cousin of radar helps clarify why it excels at building detailed spatial maps.
Why it matters
LiDAR gives machines a detailed sense of the three-dimensional world, supporting everything from mapping to self-navigating vehicles. Understanding what LiDAR is - measuring distance with reflected laser light to map surroundings - clarifies how many modern sensing and mapping technologies work. As it appears in more devices, LiDAR is an increasingly useful concept to understand.
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See also: What is GPS? Explained simply, What is a fingerprint sensor? Explained.
Sources
Published date reflects the original event date (2023-03-28). This article is original Skillo editorial written from the sources above; facts were verified in September 2026.
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