That's a point that far too few people in the remote sensing industry understand!! Put another way, try measuring the width of small objects in the scene. You'

That's a point that far too few people in the remote sensing industry understand!! Put another way, try measuring the width of small objects in the scene. You'll find there's a minimum width things will appear regardless of how small they actually are. Small, high-contrast objects will be visible, but will be wider than they actually are. Measuring the width of small bright objects is one way of estimating the spatial resolution (i.e. FWHM of the PSF) of optical imagery. And with that said, those fenceposts are not that thin. They're likely on the order of 10cm. It's widely assumed from regulations/etc that "spy" sats can get below 10cm spatial resolution. In the US, commercial sats are not allowed to collect imagery better than 10cm spatial resolution. At the 10cm resolution point, things like atmospheric lensing due to temperature variations become major issues and need to be corrected for (e.g. that "shimmer" you see above the pavement on a hot day). That type of tech gets tightly regulated very quickly even in the US's current "let private industry image how they want" regulatory environment (used to be more restrictive not long ago). So that imagery is likely somewhere on the order of 5cm to 10cm resolution in its native form. Which is pretty nuts. It's crazy what the NGA can do!