Lab2StereographicProjection.pptVIP

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2016-09-12 发布于重庆
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Lab2StereographicProjection.ppt

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Lab2StereographicProjection

Lab 2 Stereographic Projection实习2 极射赤平投影 Basic principles基本原理 Basic procedures基本步骤 Exercise in class课堂练习 STEREOGRAPHIC PROJECTION The stereographic projection is a graphical method to portray three-dimensional geometrical data in two dimensions将三维空间数据在二维空间中进行描述的方法. In this projection, planes plots as lines（面投影成线）(usually curves ) and lines as points（线投影成点）. PROBLEMS CAN BE SOLVED可以求解的问题 Angular relationship between lines or planes线或面之间的角度关系 Statistical properties of data that has direction (trend and plunge)方位数据的统计特征 PROJECTION SPHERE AND PROJECTION PLANE SPHERICAL PROJECTION STEREOGRAPHIC PROJECTION STEREOGRAPHIC NETS Wulff net---equal-angle net (A) Schmidt net---equal-area net (B) ELEMENTS OF THE WULFF NET吴尔夫网要素 PROCEDURE Put the Wulff net on the table Put the tracing paper over the Wulff net Draw the primitive circle 4. Mark a cross “+” at the center 5. Mark points “N, E, S, W” Tack the pin through the “+”to fix the position Plotting Techniques of plotting---plotting a plane with attitude 120 ? 30 Plotting the plane: 30 ? 45 1. Count 30°from point N clockwise, get point “A” 2. Rotate the tracing paper and make point “A” superposition with “E”. 3. Count 45°from “A”alone A—O, and get point B. 4. Draw the longitude great circle passing point B. 5. Revert the tracing paper, the great circle represents the plane 30 ? 45 Plotting a line: 40 - 50 1. Count 40°from point N clockwise, mark point “A” 2. Rotate the tracing paper and let point “A” superpose “E” or “N” 3. Count 50°from “A”alone A—O, mark the point B 4. Revert the tracing paper, and the point B represents the line 40 - 50 Plotting normal to a plane 90 ? 40 Solution for apparent dip from true dip Solution for the intersection line of two planes Solution for the plane determined by two intersection lines (120-36 and 180-20) Solution for angle between two planes(245 ? 30;145 ? 48) and their angular bisector（角平分线） Contouring Please solve the following problems 1. Plot the following planes o