( The Planes / Stereonet Program )
This RockWorks Geological Utilities program reads planar, linear, or
rake data from the data sheet, and displays the orientation of these features on
a stereonet diagram using points and great circles. Optional gridding is
available to display point density with line or color-filled contours.
- Input Columns: Select the names of the columns in the data sheet
that contain the strike bearing and dip angle measurements.
- Strike: Select the datasheet column that contains the strike
bearing or dip direction. ! Be sure you correctly identify the
input data type under Data Type, below.
- Dip Angle: Select the column that lists the dip angle, in
degrees, where 0 = horizontal and 90 = vertical, downward.
- Rake Angle: If the
input data type is set to Rakes you must also specify the data column
that lists the rake angle.
- Data Type: In the middle pane of the window, choose what the data listed
in the data sheet represents.
- Planes: If you choose Planes, the program will represent the data on the stereonet as poles to planes
(if Symbols are activated) or as great circles (if Great Circles are activated).
- Lines: Samples will be represented using
- Rakes: Samples will be represented using symbols. Be sure that the Rake Angle data column is specified in the left-hand
- Data Convention: Choose how the planar data listed in the data
sheet is recorded.
- Right Hand Rule: Using this convention, planar data is entered as strike bearing followed by dip angle, with the
dip direction being clockwise from the strike azimuth bearing.
- Dip Direction: Using this convention, dip direction is followed by dip angle.
- Projection: Here you can establish how points are to be projected
on the stereonet plot, as an equal angle or Wulff projection, or as an equal
area or Schmidt projection. A lower hemisphere projection is used for both
- Symbols: Insert a check here to activate the plotting of symbols on
the stereonet. If your data are specified as Lineations, the symbols will
represent the point of intersection on the stereonet sphere of the lines. If
your data are specified as Planes, the symbols will represent the point of
intersection of the poles to the planes. Expand this item to access the symbol
- Labels: Insert a check here to turn on the plotting of labels for
each point in the stereonet. Expand this item to access the label
settings. Be warned that if there are many
samples to be plotted, including individual labels can make the diagram
difficult to read. If this is the case, the Diagram Legend (below) can be
another way to identify samples.
- Contours: Insert a check in this check-box to activate the plotting
of line contours on the diagram to represent point density. Expand this item
to access the contouring settings. If you request contours, they will be drawn
based on a program-computed grid model; be sure you establish the Gridding
Options (see below).
- Colored Intervals: Insert a check in this check-box to activate the
plotting of color-filled intervals to represent point density on the diagram.
Expand this item to access the colorfill
settings. As with the line contours,
above, the color intervals will be drawn based on a program-computed grid
- Choose the Cold-to-Hot coloring option to use cold colors
(e.g. purple/blue) to represent low values and hot colors (e.g. yellow/red) to
represent high values.
- Conversely, choose the hot-to-cold coloring option to use
hot colors (e.g. yellow/red) to represent low values and cold colors (e.g.
purple/blue) to represent high values.
- Great Circles: Use this check-box and it settings to activate the
plotting of planar data as great circles. (If the source data are Lineations,
this option will be ignored.) Expand this item to select the line styles.
- Fixed line styles display the planar great circles in a constant
line style, thickness, and color, which you can select.
- Variable styles are read from the datasheet. Expand this
heading to select the Column that lists the line styles.
- Mean Lineation Vector: To activate the plotting of the mean
lineation vector, insert a check in this box. Expand this to select a symbol
to represent it on the plot, and the label.
- Best Fit Circle: Insert a check in this box to activate the
plotting of the program-computed best-fit great circle on the stereonet.
Expand this item to select its line style and color.
- Title: Check this to activate the plotting of a diagram title, and
expand this to enter the text, color, size, and position.
- Statistics : Check this item to plot a statistical legend for the
data. Expand this item to select text size and color. (See the Statistical
- Expand the Background button to turn on and off a variety of
reference lines, ticks, and labels.
- Perimeter: This is the circle that encloses the stereonet plot;
choose its color and line style. Tick Marks: These are small lines plotted at
the north, east, south, and west directions on the perimeter circle. Choose
color and line style. North Indicator: This is the letter "N" plotted above
the north tick mark outside the perimeter circle.
- The Gridding Options and Density Units items in the Stereonet Options
window are used to establish how the point densities are to be computed if
either line or color-filled contours have been requested on the stereonet
plot. The program uses a process of "gridding" to compute point densities, in
a manner similar to the gridding process for creating maps. The methods used
to extrapolate the grid node values in a stereonet differ from the methods
used in mapping, however. To access these settings, expand the Gridding
Options item. For "basic" gridding, you might select the Step Function method, with density
units in Percent. See Stereonet Gridding Options for a lengthy explanation.
- Access the Geological Utilities datasheet.
- Enter/import your strike and dip data into the datasheet. The Stereonet
program can process a single point for diagrams, but requires at least three
points for statistical calculations.
- Select the Planes / Stereonet menu command.
- Enter the requested menu items, described above.
- When all of the stereonet settings are established to your satisfaction,
click the OK button at the bottom of the window.
- The program will read the measurements from the data sheet and create the
stereonet plot, including the requested items. The completed diagram will be
displayed in a RockPlot window.
- View / save / manipulate / print / export the map in the RockPlot2D
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