A NEW TEST METHOD BASED ON SPACE VECTOR IN 3D CIRCLE FITTING
Pan Guorong 1, 2) ;and Li Huaifeng 1)
1)Department of Surveying and Geo-informatics, Tongji University, Shanghai 2000922)Key Laboratory of Modern Engineering Surveying, SBSM, Shanghai 200092
Abstract：A more simple and clear method is put forward to fitting 3D circle. 3D circle could be viewed as great circle intersected by 3D ball and plane, and centre of the 3D circle must be on the vertical plane of two points on the surface of 3D ball; According to space vector, vertical plane could be derived to solute centre with plane, and then radius could be counted inversely.Meanwhile by taking a real tunnel shield section project as the example, this method is proved to be practical.
