Is someone scanning the Earth? The mystery of the barcodes painted on the ground across the world

The mysterious barcodes painted on the ground across the world (which are actually used to calibrate airborne cameras) | Mail Online: "These mysterious QR code-like patterns are painted across dozens of locations in the U.S. Although they look rather similar to something you might be shown by an optician, they are not God's equivalent to an eye test. They are meant for another kind of all-seeing eye."