ANITA-2 flew around the Antarctic continent for 31 days in the Austral Summer of 2008/09. During that time is was recording data with a trigger rate of around 10Hz - that gives us over 20M events from the flight. From each event we can produce an interferometric image, using this we can tell if the event is caused by something on the ground or just some thermal fluctuation on board the instrument. The animation below shows the continent as ANITA-2 saw it, red areas are likely to be human bases, blue regions are quiet areas from which we saw only thermal noise. You can also view the series of coherence images made from each data run.