"The resolution is so crisp that you can see inside individual rooms. A few months ago, a company called Capella Space launched a satellite capable of taking clear radar images of anywhere in the world, with incredible resolution — even through the walls of some buildings... Capella can peer right through cloud cover, and see just as well in the daylight as in total darkness. That’s because instead of optical imaging, it uses synthetic aperture radar, or SAR. SAR works similarly to how dolphins and bats navigate using echolocation. The satellite beams down a powerful 9.65 GHz radio signal toward its target, and then collects and interprets the signal as it bounces back up into orbit..." https://futurism.com/new-satellite-buildings-day-night
