Here we discuss the method used in crystallography, but it is similar to the method used in structural geology. 1. Unlike structure contouring and other map-based techniques, it preserves only the orientation of lines and planes with no ability to preserve position relationships. Stereographic projection is a powerful method for solving geometric problems in structural geology. Stereographic Projection. An online stereonet program that allows you to create and view all of your geologic stereonet information in 3D. • The stereographic projection is the projection of the sphere. Here we discuss the method used in crystallography, but it is similar to the method used in structural Planisphaerium by Ptolemy is the oldest surviving document that describes it. It was originally known as the planisphere projection. [1] The term planisphere is still used to refer to such charts. The stereographic projection was known to Hipparchus, Ptolemy and probably earlier to the Egyptians. The Stereographic Projection E. J. W. Whittaker 1. The projection is defined as shown in Fig. One of its most important uses was the representation of celestial charts. Stereographic projection is a method used in crystallography and structural geology to depict the angular relationships between crystal faces and geologic structures, respectively. The stereographic projection was known to Hipparchus, Ptolemy and probably earlier to the Egyptians.It was originally known as the planisphere projection. Stereographic projection is a method used in crystallography and structural geology to depict the angular relationships between crystal faces and geologic structures, respectively. Visible Geology runs in the browser so there is no need to download anything, just click to add lines and double click to add planes. D. Stereographic Projection Introduction. [1] Planisphaerium by Ptolemy is the oldest surviving document that describes it. One of its most important uses was the representation of celestial charts. In such a projection, great circles are mapped to circles, and loxodromes become logarithmic spirals. A stereographic projection, or more simply a stereonet, is a powerful method for displaying and manipulating the 3-dimensional geometry of lines and planes (Davis and Reynolds 1996).The orientations of lines and planes can be plotted relative to the center of a sphere, called the projection sphere, as shown at the top of Fig. A map projection obtained by projecting points on the surface of sphere from the sphere's north pole to point in a plane tangent to the south pole (Coxeter 1969, p. 93). The term planisphere is still used to refer to such charts. Stereographic Projection. The Purpose of the Stereographic Projection in Crystallography The stereographic projection is a projection of points from the surface of a sphere on to its equatorial plane. • The sphere is divided into two equal hemispheres by a horizontal (equatorial) plane and the upper and lower poles are fixed • The plane of projection is the equatorial plane itself • The circumference of the equatorial plane is …

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