LECTURE 15 INTRODUCTION TO STEREOGRAPHIC PROJECTIONS
LECTURE 15 INTRODUCTION TO STEREOGRAPHIC PROJECTIONS
INTRODUCTION TO STEREOGRAPHIC PROJECTIONS Basic principles ° Basic procedures ● Exercise in class
INTRODUCTION TO STEREOGRAPHIC PROJECTIONS • Basic principles • Basic procedures • Exercise in class
STEREOGRAPHIC PROJECTION The stereographic projection is a graphical method to portray three dimensional geometrical data in two dimensions. In this projection, planes plots as lines (usually curves and lines as points
STEREOGRAPHIC PROJECTION The stereographic projection is a graphical method to portray threedimensional geometrical data in two dimensions. In this projection, planes plots as lines (usually curves ) and lines as points
PROBLEMS CAN BE SOLVED Angular relationship between lines or planes Statistical properties of data that has direction(trend and plunge)
PROBLEMS CAN BE SOLVED • Angular relationship between lines or planes • Statistical properties of data that has direction (trend and plunge)
SPHERICAL PROJECTION The center of the sphere Imagine the plane pass the center of a sphere of radius R the projection sphere
SPHERICAL PROJECTION Imagine the plane pass the center of a sphere of radius R, the projection sphere. The center of the sphere
SPHERICAL PROJECTION Did eu! jo uouoejold DoJoud Prolection sphere W ooo=99 Plane
SPHERICAL PROJECTION
STEREOGRAPHIC PROJECTION projection sphere Stereograph Projection plane projection o Dipping plane Primitive cicle Spher cal projection onc pla E
STEREOGRAPHIC PROJECTION
STEREOGRAPHIC NETS Wulff net---equal-angle net(Figure A) Schmidt net---equal-area net (Figure B) N 330 30° / B 300 N270 D E 240 120 150 B 180 S
STEREOGRAPHIC NETS • Wulff net---equal-angle net (Figure A) • Schmidt net---equal-area net (Figure B)
ELEMENTS OF THE WULFF NET 1. Primitive circle, 2. Central point, 3. Four special points, 4. Longitude great circle, 5. Latitude small circle. Orientation: from 0 to 360, dip: from 0 to 90 primitive circle A Latitude small circle 70 90°E 30°160 240 Longitude great circle 210 A
ELEMENTS OF THE WULFF NET primitive circle Latitude small circle Longitude great circle w 1. Primitive circle, 2. Central point, 3. Four special points, 4. Longitude great circle, 5. Latitude small circle. Orientation: from 0 to 360, dip: from 0 to 90