Two methods, the stereo-analytical method and the time-vector method used for calcu1ation are ones through parallel moving discontinuous surfaces. 所採取的赤平投影方法和矢量分析法均是平移結構面進行計算。
The results show that the design method which unifies the stereographic projection and the spherical triangle analytic geometry is one kind of both simple and the quick methods. 研究表明，採用極射赤平投影和球面三角形解析幾何相結合的設計計算方法，是一種既簡便又快捷的定向鑽進軌跡設計方法。
