San Francisco's Market Street: As Seen by Lasers
The map will form a digital record of how the street looked before extensive upcoming renovations.
Check out this sleek animation of downtown San Francisco’s Market Street, created by mounting lasers on a truck as it crawled down the block in the middle of the night:
LiDAR, or light detection and ranging, is usually used to map the Earth by aircraft from above, to capture topographical features and changing landscapes.
However, as the Market Street video shows, it can also be used on a smaller scale to create detailed visual maps. LiDAR works in much the same way as sonar or radar, except it uses light from a laser (rather than sound or radio waves) to measure the distance between the source and a point.
Here’s a cool animation of a truck collecting LiDAR data as it rolls down a street:
The San Francisco project is part of the Better Market Street initiative. The idea is to preserve a digital copy of exactly how the street looked in 2015, just ahead of the planned renovations, according to Wired.