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定向下偏心楔,可用赤平极射投影作图求解.(见中南矿冶学院1978年印《岩心钻探专辑》第1辑)赤平极射投影具有可贵的特点:1.把球面三角形变换为平面上的投影三角形,三个角和边均用度表示(即角距),仍能利用球面三角公式计算;2.可保角变换,球面上二大圆交角投影后,仍保持不变;3.除过球心的直立圆的投影是直线外(实际仍是半径为无穷大的圆),任何大圆或小圆的投影均为圆,因此可用圆规和直尺
Directional lower eccentric wedge, can be used to solve the stereographic projection projection (see South Central Mining and Metallurgy Institute 1978 “Core Drilling Album” first series) red flat projection has valuable features: 1. The spherical triangle is transformed into a plane Of the projection triangle, the three angles and the edge of the degree that (that is, the angular distance), can still be calculated using the spherical trigonometric formula; 2 can conformal transformation, the two round corners on the spherical projection projection, remains unchanged; The center of the ball through the vertical projection of the circle is a straight line (the actual radius is still infinite), any large circle or small circle projection is round, so the compasses and ruler