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For instance: https://www.thespacereview.com/article/5003/1
We don't know that. The competition (USSR/Russia) also keeps secrets, and not being a free society, has much less reason to publish them later.
If you think the public DEM/DSM datasets like the ASTER GDER v3 or SRTM GL1 V3 are pretty good, I would bet that the DoD has things far more accurate than those as digital models of the surface and built environment of the earth's surface.
It was good enough then to track individuals movement and 'replay' where they had been over the last few days to figure out where they came from and associate them with other people/ vehicles/ rf signatures.
I think it's safe to assume that the quality kept quietly improving from orbit since then- it's just too good to publicly release / declassify.
I suppose even higher and you could start resolving things like license plate numbers from space, but it just seems like sharply diminishing returns in general.
[1] - https://xrtechgroup.com/who-has-the-highest-resolution-satel...
Pocket backdoors.
Although one could randomly stumble on some interesting anecdote here and there in the NRO archive, overall that collection was not made to be easy to navigate, and one would have to be very patient to sift through it thoroughly. Maybe the situation is better now.
[1] https://www.nro.gov/foia-home/foia-declassified-nro-programs...
clearancejobs.com
https://www.dailymail.com/sciencetech/article-16172545/us-sp...
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