超声波传感器和摄像机组合可获得修剪平面几何中心线的绝对坐标。
World coordinates of geometric center line of pruned plane was acquired by combination of Ultrasonic sensor and CCD camera.
结合初始活动标架方位、传感器结构，运用递推算法计算管道中心线局部几何性质参数。
Combined with the initial position of the frenet frame and sensor structure, the local geometric parameters of the pipe Central Line can be calculated by using recurrence algorithm.
由于弹性杆的中心线或弹性细丝可以抽象成空间曲线，然后根据空间曲线论和微分几何的知识进行处理。
The centerline of elastic rod or elastic filament can be abstracted as space curves to deal with them by the knowledge of the theory of space curve and differential geometry.
摘要：道路几何线形是由直线与曲线连接而成的空间立体线形形状，也就是道路中心线的空间描绘。
Abstract: : the road geometry is are connected by a straight line and curve of a three-dimensional linear shape, also is the center line of the road space.
目前，基于路段中心线的二维道路网络模型已经普遍存在，但其在几何特征及拓扑关系表达等方面都难以满足复杂交通系统的需求。
The information of centerlines can not cover the changes of lanes, and the two-dimensional model is also inadequate in the expression of three-dimensional transportation networks.
目前，基于路段中心线的二维道路网络模型已经普遍存在，但其在几何特征及拓扑关系表达等方面都难以满足复杂交通系统的需求。
The information of centerlines can not cover the changes of lanes, and the two-dimensional model is also inadequate in the expression of three-dimensional transportation networks.
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