[jhayward]

It's not uncommon for older aerial photos to be single-pixel lines that the film is moved past. The motion of the film is correlated with the motion across the ground, so you can reconstruct a 2nd axis from the exposure.

There's no shutter speed, it's continuous.

[dylan604]

"We helped map the Kerrville floods"

"It's not uncommon for older aerial photos"

The Kerrville floods were last summer