aircraft flies along a line, its view is constantly changing. Below
are two pictures taken several seconds apart...that's a few hundred feet
apart. Those two pictures are the view of a giant whose eyes are
those few hundred feet apart. But that's equivalent of a view of
a normal sized person looking at a tiny model. This is the stereoscopic
model, a tool widely use in mapping, in aiming the big rifles in military
tanks, and by the savvy mountain climber looking for routes on difficult
faces (using a Polaroid camera).
You who have practiced viewing stereoscopically by crossing your eyes can see the view of the giant.
|The infamous Terwilliger Curve: site of numerous truck rollovers, spilled loads, auto accidents, interminable tieups--and, therefore, posted 50-mph speed limit with special patrol car turnouts to aid enforcement and several ODOT roadcams to monitor the troubles.|
There are many different
ways we can use optical tricks and technology to see better.
Stereoscopic vision in one. Infrared imaging is another. Radar is, too.
|Viewing stereoscopic pairs
of photos requires a bit of practice. Some people find it easier
to cross their eyes; others find it easier to spread--as though you were
looking at a distant object.
The above stereo photos can be viewed either way. The left pairs are for spreading; the right pairs are for crossing.
The tunnels to Canyon Rd
on Hwy 26 can be seen the the lower left of the upper photo.
One way to learn to view these pairs is to try it on very simple drawings. Here is a drawing that looks like someone looking at you cross-eyed. Look back at him cross-eyed and you will see three one-eyed "Cyclopses," and the one in the middle is stereoscopic. Stereoscopic vision has also been called "Cyclopean perception." The reason is that we "see" it, not on the retinas in our eyes, but rather in the visual cortex, which is at the back of the brain. That middle Cyclops has its one "retina" in the back of its brain.