Spatial arc cut

A spatial arc section ( trispheration ) is a geodetic location method in 3D space, in which the exact spatial position of a point is determined from three distance measurements. The solution to the problem boils down to the intersection of three spheres .

In contrast to the flat solution - the simple arc section - on the surface of the earth or a map , a third circle of distance is necessary because of the third coordinate to be determined (usually the height ) , which must be expanded to a sphere in 3D space.