They are finding the specific spots on the ground at the construction site where specific things are supposed to be built.
They use measurements and geometry to locate and mark where the building is supposed to go and/or not go. Those things they’re looking through could be anything from old-school ‘transit’ telescopes/compasses to modern computerized models that measure distances to flags and other features with a combination of lasers, GPS, and other things. Either way, they measuring distances and angles.
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