Since no historical data is available, the next best bet it to use Patty as a walking ruler to approximate a cross-field measurement. We know the exact frames representing 2 sides of the triangle (to the camera). Let Patty's trackway represent the 3rd "irregular" side. If Patty's step length was 41" in 17 steps she would have traveled 58'. Because she didn't travel in a straight line, the length of the 3rd side of the triangle is probably closer to 56'. Keep in mind we only need to establish a maximum distance for 17 steps of the trackway. For example, if a 60" step length is required to support a 15mm lens, then you have to reject the 41" estimate and accept that Patty was a giant.