Whenever a road is built or worked on, a worker is looking through one of those telescopes on a tripod. I assume they are surveying or measuring straightness. please?
In: Technology
I’ll give the old school answer. It’s a bit different now with gps and such.
Theyre making sure the road is exactly where they want and curves the way it’s supposed to.
They start at some place that is marked on a map as being some exact latitude, longitude, and elevation. (It’ll be a little metal circle plate on the ground. They’re all over the place.)
They set that device there, and someone with a post goes to another marker.
They look thru the telescope and point it til the cross hairs in the scope line up with the post. The map says what the compass angle between the markers is, so they set a dial on the telescope base to match.
Now, to find the exact position of another point, for instance some point on the road being built, they move the post there. Now they turn the telescope to line up with the new post. They can read the correct compass direction off the dial. They can tell if the new location is higher or lower by the height on the post at the cross hairs (that’s why the posts have a checker pattern). They get the distance using a rangefinder. They do math to figure out the location.
Newer systems are mostly automated and computerized and include GPS tom improve accuracy.
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