Digital cartographer Levi Pearson has taken sightings information from the National UFO Reporting Center and placed it all together into the map you see below.
The map does, however, represent a great use of location-based data – and CartoDB. And it provides a nice snapshot of where and when sightings have surged and dipped over nearly 100 years, as Pearson noted in his blog post:
The first thing that jumped out was the increase in sightings during the 1950s and 1960s. It turns out that the CIA’s U2 program may be responsible for several of these report. In late 2014 the CIA took to Twitter to take credit for nearly HALF of the UFO reporting in the 1950s. – Source