Options
The Options tab of the Fault Lithology Modelling form contains options for the Spine Modeller or RBF Modeller your model. Only one option can be configured for each form.
You can select the Global Defaults option to use the global lithology defaults for the Spline Modeller, or select Custom to define the settings for this model.
Spline Modeller
The Spline Modeller provides the smoothest output while closely honouring any Dip and Dip Direction data. It is ideal for producing surfaces that do not bend or change direction too quickly. If the input data defines a surface with abrupt changes or irregularities, the RBF modeller may be more suitable.
Structural Orientation Accuracy
Use the slider or enter a value directly in the field to set the required accuracy of structural orientation for the surface map. The higher the value, the more accurate the structural orientation, but the more time and resources the modelling will require.
RBF Modeller
The RBF Modeller uses an RBF (Radial Basis Function) to interpolate a surface. The RBF method is a numerical technique that uses radial basis functions, which are mathematical functions that are centered at a certain point and decrease in value as you move away from that point. RBFs are used to approximate a function or a surface by combining multiple radial basis functions with different centres and weights. The RBF method is less sensitive to any Dip and Dip Direction data than the Spline Modeller, but it can better handle surfaces with abrupt changes or irregularities.
Copy Points Downdip
Select this option to copy each point downdip by a specified Distance before creating the surface through those points. This may be necessary to make the fault dip correctly.
Use Linear Kernel
Two different RBF methods are available; Thin Plate Spline and Linear. The Thin Plate Spline method is the default and behaves in-between the Spline Modeller and the Linear RBF method. The Linear method can be used to model surfaces that change direction abruptly. It will produce surfaces that are less smooth than the Thin Plate Spline method, but it can deal with ‘rougher’ surfaces.
Click the Save and Close button when the lithology Modelling form is completed, to return to the Surface Map.