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# What is triangulation?

Answer #1: Shooting two azimuths from different locations to find out where atarget object is by where the lines cross on a map. Alternatively,shooting azimuths to two diffe…rent objects to find out where YOU are. ====== Answer #1.5 : You are standing on one riverbank. There is a tree on the otherriverbank. You want to know the width of the river. People have triedstretching a tape measure across it. None of them was ever seen again. You haveto come up with a better way to measure it. You will triangulate it. -- Stand somewhere roughly opposite the tree. It doesn't have to beperfect. Jam a bright red stick into the ground between your feet. -- From there, with your tape measure, walk along the riverbank,mark exactly 100-ft from where you started, and set up your tripod there. Lookthrough your spotting scope and find the red stick in the ground on yourside of the river. Then measure the angle you have to turn the scope in orderto spot the tree on the other riverbank. Write down the angle in your notebook. -- Go back to the red stick. Walk along the riverbank in the opposite direction , mark exactly 100-ft that way, and set up your tripod there. Lookthrough the scope again and find the red stick in the ground on your side ofthe river. Then measure the angle you have to turn the scope in order to spot thetree on the other riverbank. Write that one down in your notebook too. -- You have laid out a triangle. The three points that make thetriangle are the tree and the two points 100-ft in each direction from the redstick. -- On your side of the river, you know the length of the triangle's'base' ... it's 200 feet ... and you know the angle of the triangle at each end of the base. -- With that information and just a tiny bit of trigonometry, youcan calculate the width of the river at the place where the tree is ... it's theheight (altitude) of the triangle. You can do all the calculating indoors, with a pencil andpaper, and it's as accurate as your measurements of the 100-ft lengths and the twoangles were. (MORE)