Drillhole Structure
The Structure visualisation draws an oriented disc at each structural measurement down the hole. Unlike the ordinary disc visualisation, whose discs sit square to the hole, a structure disc is tilted into the plane of the measured feature, so a bedding, fracture or vein plane is shown at its true orientation in space.
Note
Requires the Professional edition. In the Community edition, structure visualisations in a project can be viewed read-only: shown, hidden and faded, but not created or changed.
Structure is drawn from a point table that contains a dip and a dip direction for each measurement. If your data holds alpha and beta angles relative to the core axis instead, convert them first with the Alpha/Beta to Dip/Dir button in the Drill Manager.
Adding the Visualisation
Structure is not one of the default visualisations, so you need to add it yourself. Right-click the drill layer, choose Add Visualisation, then DrillStructure.
Choosing the Orientation Fields
Hover over the drill layer and click the Structure button to open the editor. At the top, select the Table holding your structural measurements, then set the Dip and Dip Direction dropdowns to the columns that hold those angles.
Spatial Integration guesses the dip and dip direction columns from their names when you choose the table; always check the guesses and correct them if needed.
Colour and Radius
Like the disc visualisation, a structure disc has independent Colour and Radius symbology classes, each of which can be Single, Categorised, Graduated or Continuous. A common approach is to colour the discs by structure type, using a Categorised class on a Type field, so bedding, fractures, veins and unconformities are each drawn in their own colour, as shown above.
The two classes are locked to the same attribute by default. Click the lock icon next to the Attribute dropdown to unlock them when you want Colour and Radius to be driven by different fields, for example colouring by structure type while sizing by a confidence or intensity value.
Labels
Turn labels on by clicking the label button next to the Structure visualisation button. Every label shows the measured orientation as dip » dip direction in degrees, for example 45° » 234°.
When the colour is driven by an attribute (such as structure type), its value is shown on the line above the orientation.
