Almost certainly calibrating space based weapons. Those are fractals and I've used them in my own shape detection code in C++ to see if my algorithm can recognize all the angles used. This is critical for an orbital platform that uses street maps to identify precision targets like the White House or an airstrip somewhere.
This means that the Chinese are advancing at leaps and bounds far faster than anybody predicted. The real question is how far have they gotten with true doomsday weapons like "rods from god" or red mercury cluster bomblets. Research in the 1960's studied the possibility of ravaging whole grids on the map with the equivalent of nuclear napalm from orbit, using dirty payloads of plutonium or cobalt to maximize the radioactive residue after the deed. I have PDFs of declassified documents from the Rand Corporation that studied these tactics the same way they talked about artillery fire or simple manpacked nukes.
It's important to point out that surviving inside a shelter underground with proper entrances and ventilation baffles is still very possible even if you were beneath a swath of nuclear napalm. It is survival aboveground in a small basement or concrete building with minimal protection that would be impossible in a target zone. Correctly constructed Vaults survive the worst science-fiction horror you could imagine aboveground and the research conducted with live nuclear weapons proves it.
P.S. I have a good friend in the Air Force who told me twenty years ago that the espionage that resulted in the loss of red mercury was worse than the leakage of the secret of the hydrogen bomb - he told me the U.S. government has been trying to recover gracefully ever since it got out and they planted a comprehensive cover story that it was all a "hoax" they used to trap terrorists with. He told me the stuff permits nuclear reactions in devices the size of golf balls and it was one of the deadliest weapons ever stolen from Los Alamos lab research.
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While the sheeple watch AMERICA'S GOT TALENT, above them in the skies orbit military weapons of enormous destructive power and unbelievable capacity for mass annihilation. The U.S. government claims to be worried about goatherders in bungistan with crap like this outside of international law above the population of the planet as they sleep each night. Imagine the gall.
First ten minutes of World War III, the entire planet is going to get a very rude shock when they discover the world they thought they were living in never existed.