Source - http://www.lidarbasemaps.org/
Lidar also known as LIght Detection And Ranging, Its a system of light from a laser that detects or measures distance. The way to get a lidar is to have something airborne, like a helicopter, to scan the with a laser.
As you see in this picture above it shows an array of color mostly green, yellow and red, each color represents different levels of distances low, medium and high respectively. The lidar doesn't use any kind of radio waves so hence it's not a radar.
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