Editing an Indicator Interpolant

To edit an indicator interpolant, you can either double-click on the interpolant in the Interpolants folder or right-click and select Open. The window that appears is divided into tabs that let you change the different objects that make up the interpolant. Many of the options are the same for numeric and indicator interpolants.

When creating an indicator interpolant, only a basic set of parameters is used. The Edit Indicator Interpolant windows provide finer controls over these basic parameters so you can refine the interpolant to factor in real-world observations and account for limitations in the data.

Adjusting the Values Used

The Values tab in the Edit Indicator Interpolant window shows the values used in creating the interpolant and provides options for filtering the data. You cannot change the values used, but you can filter the values using the Query filter and Surface filter options. You can also adjust the values using a contour polyline, which is described in Adding a Contour Polyline below.

To apply a query filter, tick the Query filter box in the Values tab and select the available queries from the list.

To change the object used as the Surface filter, select the required object from the list. Note that the list contains an object that defines the interpolant’s own boundary, which can be adjusted in the Boundary tab.

Adding a Contour Polyline

You can adjust the values using contour polylines set to inside (1), outside (0) or to the iso-value. This is a useful way of controlling blowouts, and adding a contour polyline does not affect the indicator’s statistics.

Here, the inside volume occurs in the corner of the model because of the high-value points at the bottom of the drillholes:

This can be adjusting by drawing a contour polyline set to the outside value at the bottom of the drillholes. For example, adding a polyline (in yellow) at the bottom of three drillholes removes the blowout:

To add a contour polyline, expand the interpolant in the project tree. Right-click on the values object and select New Contour Polyline:

Next, choose whether you will draw a new polyline or use one already in the project, then select the contour value:

Only GIS lines, polylines imported into Leapfrog Geo or polylines created using the straight line drawing tool can be used to create contour lines.

Click OK. If you have chosen the New Drawing option, the new object will be created in the project tree and drawing tools will appear in the scene. Start drawing in the scene as described in Drawing in 3D. When you have finished drawing, click the Save button (). The new contour will automatically be added to the model and will appear in the project tree as part of the interpolant’s values object.

To edit the polyline, right-click on it and select Edit Polyline or add it to the scene and click the Edit button () in the shape list. If you wish to remove a contour polyline from the interpolant, right-click on it in the project tree and select Delete or Remove.

You cannot change the value on the contour once it has been created. You can, however, share the polyline and use it to create a new contour polyline. To do this, right-click on it in the project tree and select Share. The polyline will then be added to the Polylines folder and can be used elsewhere in the project.

Compositing Parameters for an Indicator Interpolant

When an indicator interpolant has been created from uncomposited values, compositing parameters can be changed by double-clicking on the interpolant in the project tree, then clicking on the Compositing tab.

The Compositing tab will only appear for interpolants created from uncomposited drillhole data.

You can composite in the entire drillhole or only where the data falls inside the interpolant boundary. See Numeric Composites for more information on the effects of the Compositing Length and Minimum Coverage settings.

Adjusting the Interpolant Boundary

To change an indicator interpolant’s boundary, double-click on the interpolant in the project tree, then click on the Boundary tab:

Controls to adjust the boundary will also appear in the scene.

Tick the Use Topography box to use the topography as a boundary. The topography is normally not used as a boundary for interpolants and so this option is disabled when an interpolant is first created.

The Boundaries list shows objects that have been used to modify the boundary. You can disable any of these lateral extents by unticking the box.

Techniques for creating lateral extents for interpolants are similar to those for creating lateral extents for geological models. See Modifying the Model’s Boundary for more information.

The Cut-off Value

To change the Cut-off value for an indicator interpolant, double-click on the interpolant in the project tree, then click on the Cut-off tab. The tab also shows the distribution of the data used to create an indicator interpolate:

Bin count defines the number of bins, where a larger bin count results in a finer histogram.

Adjust the Cut-off value, if required, and click OK to process the changes.

Changing the Trend for an Indicator Interpolant

You can apply a global trend or a structural trend to an indicator interpolant. To do this, add the interpolant to the scene, then double-click on the interpolant in the project tree. Click on the Trend tab in the Edit Indicator Interpolant window.

Techniques for setting a trend for an indicator interpolant are the same as those for a numeric interpolant. See Using a Global Trend and Using a Structural Trend in Changing the Trend for a Numeric Interpolant.

Adjusting Interpolation Parameters

To adjust interpolation parameters for an indicator interpolant, double-click on the interpolant in the project tree, then click on the Interpolant tab:

Two models are available, the spheroidal interpolant and the linear interpolant. See The Spheroidal Interpolant Function and The Linear Interpolant Function for more information on the settings in this tab.

Indicator Interpolant Surfacing and Volume Options

To change the properties of the isosurface for an indicator interpolant, double-click on the interpolant in the project tree, then click on the Volumes tab:

An alternative to double-clicking on the interpolant is to double-click on one of the output volumes, which opens the Edit Indicator Interpolant window with the Volumes tab displayed.

The Iso value can be set to values from 0.1 to 0.9. Clicking the arrows changes the Iso value in steps of 0.1. To use a different value, enter it from the keyboard.

Setting a lower value for Resolution will produce more detail, but calculations can take longer. You can also set the resolution to be adaptive. See Surface Resolution in Leapfrog Geo for more information.

When Exact clipping is enabled, the interpolant isosurface will be generated without “tags” that overhang the interpolant boundary. This setting is enabled by default when you create an interpolant.

Use Volume filtering to discard smaller parts of the volumes in which you do not wish to carry out further processing. For example, this interpolant has numerous small volumes:

Enabling Volume filtering removes the smaller parts: