6.First, the vertexes are sequenced according to their curvature to form a descending order vertex array.The rearer vertex has smaller local curvature.
首先对所有顶点按照大小进行排序,形成按照降序排列顶点集,顶点越靠后,其局部越小。
7.An L-band safety remote control system is introduced which is composed of three stations and one center in order to increase coverage and overcome the limit of earth curvature to intervisibility.