A video to show how Lidar works...
This video shows how Lidar systems work in general, to measure trees, building, etc. and how they are used with other vehicles including aeroplanes and ships.
Other Lidar related articles:
Lidar Lite - Laser based Sensor
Quanergy\'s $250 Solid-State LiDAR - Self-Driving to the Masses?
Magna teams with Innoviz LiDAR for Autonomous driving system
LIDAR - in Glossary