What is equal area Stereonet?
Equal Angle vs Equal Area Since using Equal Area preserves areas (i.e., relative areas on reference sphere versus projection), this means that there is no distortion of area from the center of the stereonet to the perimeter, therefore allowing you to more accurately compare sets anywhere on the projection.
What feature does a Schmidt Net preserve?
In geology this is usually referred to a Schmidt Net, after Walter Schmidt. Small circles (all 10° radius) make it easier to see that area is preserved reasonably well across all orientations. Angles are slightly distorted and make the circles appear as ellipses.
How would you describe a Stereonet?
Stereonets are a graphical tool representing the hemisphere of a globe, used for presentation, analysis and interpretation of three-dimensional directional data such as planes and lines.
What does a Lambert map projection show?
Description. The Lambert azimuthal equal-area projection maintains land features at their true relative sizes while simultaneously maintaining a true sense of direction from the center. The world is projected onto a flat surface from any point on the globe.
What is beta diagram in geology?
In its application in structural geology, the dip and strike of a fold surface are recorded as a great circle, and two great circles representing both limbs of a fold intersect along a line called a β-axis (in this case the fold axis). From: beta diagram in A Dictionary of Earth Sciences »
How is a plane plotted on a stereonet?
A stereonet should be visualized as the bottom half of a sphere. Planes intersect the sphere as great circles and lines intersect the sphere as points. Its helpful when starting out with stereonets to visualize the plane or line as it cuts through a 3-dimensional bowl (props may be helpful). the north pole of the net.
What does a stereonet show?
Stereonets are a graphical tool representing the hemisphere of a globe, used for presentation, analysis and interpretation of three-dimensional directional data such as planes and lines. A plane will cut the sphere forming a line (great circle) on the sphere’s surface, whereas a line will generate a point.
What is a stereonet in 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).
Why are equal area stereonets used in structural geology?
Stereographic Projection Equal-area stereonets are used in structural geology because they present no statistical bias when large numbers of data are plotted. On the equal-area net area is preserved so, for example, each 2 degrees polygon on the net has the same area.
Which is the correct way to label A stereonet?
Always begin by labelling your stereonet!! -North, south, east, west – Lower/upper hemisphere – Equal area/equal angle Lower hemisphere Equal area Plotting is done on transparent paper laid over the stereonet that can be rotated around a thumb tack poking up at the center of the net.
Which is the best stereonet for plotting discontinuity?
The equatorial projection is the one generally favoured for plotting and analyzing discontinuity data . The most common Equatorial projection is the “equal area” stereonet (aka Schmidt or Lambert stereonet). 6 of 18 Erik Eberhardt – UBC Geological Engineering EOSC 433
What is the definition of a stereonet system?
stereonet A two-dimensional, circular representation of a sphere in which the lines of longitude and latitude form a system of coordinates (a ‘net’), on which projections of great and small circles occupy the equatorial plane of a reference sphere.