What is Wulff net?

The net is a projection of a collection of great and small circles, which represent lines of latitude (small circles) and lines of longitude (great circles) on the sphere, as seen here: 3 great and 2 small circles.

What is trace in stereographic projection?

For stereographic projection, a line or a plane is imagined to be surrounded by a projection sphere (Fig. 1a). A plane intersects the sphere in a trace that is a great circle that bisects the sphere precisely. A line intersects the sphere in a point.

What is a Stereonet geology?

A stereonet is a lower hemisphere graph on to which a variety of geological data can be plotted. Stereonets are used in many different branches of geology and can be used in a range of ways beyond those which are discussed here (see references for further uses).

Which is true about Wulff net construction?

Wulff net, or stereographic net, is a stereographic projection of the longitude and latitude curves on a sphere, which can be drawn as two series of circles with their centers and radii as shown in Fig.

How are stereographic projection used in the study of crystal?

The stereographic projection is used to represent the angles between the faces of a crystal and the symmetry relationships between them. Imagine that the crystal is centered within a sphere, the normal to the crystal faces will give a consistent set of points uninfluenced by the relative sizes of the faces.

What is stereographic projection of complex number?

In geometry, the stereographic projection is a particular mapping (function) that projects a sphere onto a plane. The projection is defined on the entire sphere, except at one point: the projection point.

Why do we need stereographic projection?

So the stereographic projection also lets us visualize planes as points in the disk. For plots involving many planes, plotting their poles produces a less-cluttered picture than plotting their traces. This construction is used to visualize directional data in crystallography and geology, as described below.

What is stereonet used for?

The use of stereographic projection or stereonets is the bread and butter of structural analysis. They are used to work out many tricky three dimensional relationships; they are used to plot and represent all kinds of geometric data that you collect in the field; they are used in the analysis of that data.

What is the Wulff net?

If we consider rather more of each, we can project them downwards as before using the principle of projection to construct a stereographic projection of planes which are two degrees apart. This creates the Wulff Net. This can be used to place planes and poles of planes on a stereogram with great accuracy.

How is the Wulff net used to construct a projection?

Having understood how the projection is constructed, we can now look at how it is examined using the Wulff Net. The net is a projection of a collection of great and small circles, which represent lines of latitude (small circles) and lines of longitude (great circles) on the sphere, as seen here:

What is PPTA and why is it important?

These therapies are used by small patient populations worldwide to treat a variety of rare diseases and serious medical conditions. PPTA also administers standards and programs that help ensure the quality and safety of plasma collection and manufacturing and protect both donors and patients.