Triangulation
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High Quality Content by WIKIPEDIA articles! In trigonometry and geometry, triangulation is the process of determining the location of a point by measuring angles to it from known points at either end of a fixed baseline, rather than measuring distances to the point directly. The point can then be fixed as the third point of a triangle with one known side and two known angles. Triangulation can also refer to the accurate surveying of systems of very large triangles, called triangulation networks. This followed from the work of Willebrord Snell in 1615-17, who showed how a point could be located…mehr

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High Quality Content by WIKIPEDIA articles! In trigonometry and geometry, triangulation is the process of determining the location of a point by measuring angles to it from known points at either end of a fixed baseline, rather than measuring distances to the point directly. The point can then be fixed as the third point of a triangle with one known side and two known angles. Triangulation can also refer to the accurate surveying of systems of very large triangles, called triangulation networks. This followed from the work of Willebrord Snell in 1615-17, who showed how a point could be located from the angles subtended from three known points, but measured at the new unknown point rather than the previously fixed points, a problem called resectioning. Surveying error is minimised if a mesh of triangles at the largest appropriate scale is established first, that points inside the triangles can all then be accurately located with reference to. Such triangulation methods dominated accurate large-scale land surveying until the rise of Global navigation satellite systems in the 1980s.