I don't think you understand what a "pixel" is.
If you want to see a 1 km x 1 km area at a resolution of 0.1m, then you will need 10 000 x 10 000 = 100 000 000 points on the image, AKA 100 megapixels. This is (ideally) independent of technology. You can walk around and take fifty 2 MP pictures and stitch them together, you can fly a drone a few hundred meters up and take a wide-angle shot, or you can fly a satellite overhead and take a picture from space. The distance doesn't matter.
From that, it's a simple extrapolation that it'll (again, ideally) take 100 MP/km^2 * 778 km^2 = 77800 megapixels = 77.8 gigapixels to surveil the land area of New York City to that level of detail. Again, that could be from an array of low-resoultion cameras, a wide-angle camera nearby, or a telephoto camera far away.
(Also, a brief search suggests facial recognition needs about 3mm (0.003m) resolution to identify individuals, not 100 mm (0.1m))
A 1 petapixel camera could cover an area of 3162 km x 3162 km to that resolution, or roughly the entire United States in a single snapshot (ignoring practicalities like the curve of the earth, of course). It could also be used to count someone's nosehairs if you set it up differently.
Lesswrong disclaimer
2026-03-01
Petapixel cameras won't exist soon
Disclaimer
Huge amount of background context on why I care about petapixel cameras
Petapixel cameras won't exist soon