Define Isopach Maps Auto-Run

The Define Strata Isopach Auto-Run is for building the macro auto-run file containing the isopachs to create. There is still the option to run the auto-run from here if desired. If there are not any drillholes, for example, you are coming from grids, just hit Enter when prompted to select drillholes.

The first dialog shows the defined isopachs that will be created. There are buttons to Edit, Add and Remove the row. The Sort will sort them in order. Up and Down will move them up or down the list. The On or Off buttons turn them on or off for processing. The Make Isopachs button starts the process and creates the isopach maps. Load and Save/SaveAs will load or create the CTR file. The two entry dialog boxes are slightly different, depending on drillholes or grids.

Processing on: This needs to be selected to build the isopach. It controls the Process column on the first screen.

Strata Name: This will display the strata name if isopaching from drillholes. If isopaching a grid, then this will be blank.

Value to Process: This is the attribute or item to isopach. It can be an elevation, thickness or any quality attribute. It will be grayed out if isopaching a grid file.

Contour Layer: Enter the layer for the contours.

Color: Choose a color for the contour layer.

Contour Interval: Enter a contour interval . This is for the intermediate contours. Index contours are set below.

Smooth Contours: This toggle will determine if the contours are smoothed. The slide bar controls the smoothing from Low to High.

Smoothing Sub-Division Levels: The smoothing subdivision option will internally subdivide the grid cells with a quadratic smoothing algorithm to help create smoother contours.

Reduce Vertices: This option removes vertices from the contour lines, as long as the contour line does not move more than the Offset Distance from the original location.

Drawing File: There is the option to output each isopach map to its own drawing file. To do this, just select the Choose Drawing File button and enter a drawing name. This name is displayed above the button. If this is not selected, then the isopachs are drawn in the current drawing.

Grid File: The Choose Grid file button is active only if the Modeling Method is set to Grid File. The grid to isopach is displayed above the button.

Hatch Zones: This option fills in the contour zones with the specified hatch pattern and colors.

Modeling Method: There is the option to model the drillholes by Triangulation, Inverse Distance to any power, Kriging, Polynomial and Least Squares. Using a premade grid file is also set here if the drillholes are not used.

Draw Index Contours: Turn this option on to generate the index contours.

Set Index Options: This brings up the Index contour options screen to set the interval, width, layer and color shown below.

Label Contours: This option will label the contours.

Set Label Options: This button will bring up the Contour Label Options screen shown below.

Ignore Zero Values: This option will ignore any zero values for contouring.

Range: Min Z and Max Z: This defines the low and high values that will be contoured. Any values outside of this range will not be contoured.

Use Triangulation Subdivision: When modeling with Triangulation or Polynomial, this will subdivide the triangles into at least 3 smaller triangles for smoother contours.

Extrapolate Grid To Full Grid Size: When modeling with grid files, this option will extrapolate to assign values to any null cells in the grid file.

Use Global Trend Extrapolation: When modeling with Triangulation or Polynomial, this will extrapolate to the edge of the grid limits based on the overall global trend.

Set Kriging Parameters: When modeling the drillholes with Kriging, This button brings up the Kriging Spatial Continuity Model settings screen shown below.

Inverse Distance Power: When modeling the drillholes with Inverse Distance, this is the power that the distance is raised to. It can be any power, including decimals.

Elliptical Inverse Distance: If the ore body is long and narrow, sometimes an elliptical inverse distance modeling method is preferred. This option will allow for two different powers to create an ellipse.

Anisotropic Azimuth/Factor: When using the Elliptical method, this is the azimuth for the second factor, and the second factor power.

Prompts

Select drillholes, channel samples and strata polylines or ENTER for None. Select Enter if isopaching only grid files.
Select objects: all
61 found
Select objects:
Reading drillhole 194
Finding splits ...
Finding pinch out ...
Calculating seam stacking ...
Select the Inclusion perimeter polylines or ENTER for none.
Select the Exclusion perimeter polylines or ENTER for none.

Pulldown Menu Location: StrataCalc
Keyboard command: chiso2
Prerequisite: Drillholes or grid files