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Saturday, May 02, 2015

Explainer: What are lidar, radar and sonar?

3-D lidar scan of the Interstate 510 bridge in New Orleans, LaHELLLOOO! LOOH. Looh. looh.

If you have ever heard an echo, you’ll be familiar with the basic principle behind three similar technologies: radar, sonar and lidar.

An echo is the reflection of sound waves off of some distant object. If you shout in a canyon, the sound waves travel through the air, bounce off the rocky walls and then come back to you.

Sonar (SO-nahr) is the most similar to this scenario. This technology also relies on sound waves to detect objects. However, sonar is typically used underwater.

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