More Information

Stereographic, Rose, and Lineament Diagrams

For structural charts, Aabel worksheets support variable types trend, dip/plunge, and azimuth, and you can defineif a variable of type azimuth is the azimuth of dip.


Stereographic Scatter and Contour Diagrams

Aabel supports trend, dip/plunge, and azimuth variables, and includes the following stereographic scatter chart types:

  • Stereographic scatter graphs with equal angle projection using an equatorial or polar grid. The top image below is an example of an equal angle projection using an equatorial grid).
  • Stereographic scatter graphs with equal area projection using an equatorial or polar grid.
  • Stereographic contour graphs with equal angle projection using an equatorial or polar grid.
  • Stereographic contour graphs with equal area projection using an equatorial or polar grid. The bottom image below is an example of an equal area projection using an equatorial grid

With a few clicks of the mouse, you can:

  • Modify the projection, density contour intervals, or the plot variables
  • Generate tables for representing information regarding the projection type, number of measurements, spherical variance, and normalized eigenvalues and eigenvectors

The data used to plot the stereographic diagrams below are from the USGS Open File Report 01-428, regarding outcrop structural data from southeastern Alaska.

A Stereographic scatter Chart With Equal Angle Projection

A Stereographic Contour Chart With Equal Area Projection

Rose Diagrams (Circular Histogram)

Aabel supports trend and azimuth variables, and includes:

Selecting rose histogram bins will highlight the corresponding data on other diagrams and in the source worksheet. Free-hand selection of bins/petals will allow you to generate new worksheets from the selected bin data.

With a few clicks of the mouse, you can:

Full Circle and Half Circle Rose Diagrams

Lineament Diagrams

Aabel supports trend and azimuth variables, and includes:

The data used to plot the lineament diagrams below are from glacial striations measured in an area of southern Finland (source of data: Davis, J.C., 2002).

Exploratory Analysis of Orientational and Directional Data

Aabel exploratory tools such as data brushing (to view data interrelationships) and step-wise X-zooming (to zoom into a region of data), are available to stereographic scatter and Rose diagrams.

Exploring Orientational and Directional Data