Sample Database

This section of the Directional Variography interface to select the database and database fields that are to be used to generate the variograms.

Use Database

Select this option to use sample data from an Isis composites database.

Isis File

Select this option to nominate an Isis database. The drop-down list displays all Isis database files found in the current working directory. Click Browse to select a file from another location.

ODBC Link

Select this option to nominate an ODBC link database. Select the design name from the drop-down list.

Use Map file

Select this option to use sample data from an ASCII mapfile (.map). The drop-down list contains all.map files found in the current working directory. Click Browse to select a file from another location.

Sample Group

Enter the name of the groups (database keys) to be loaded. Wildcards (* multi-character wildcard and % single character wildcard) may be used to select multiple groups. Multiple groups only apply to Isis databases (ASCII mapfiles consist of one group).

Location X/Y/Z

Enter, or select from the drop-down list, the names of the fields containing the X, Y and Z coordinates.

Primary Grade Field

Specify the name of the grade field that will be used to generate the variograms.

Secondary Grade Field

Specify the name of the second grade variable. This should only be entered for cross-variography. Selecting a secondary field will cause all variograms types to be treated as cross variograms.

Use sample database down hole fields for variograms

Select this check box to create a down hole variogram. You will be required to specify a depth field and hole identifier from in the nominated database.

For down hole variography, only the depth of the sample matters and only samples in the same drillhole are compared. This prevents drillholes being collared at the same position. Also, only one direction of variography is calculated (a plunge of -90°). All samples in a given drillhole are assumed to be located in a vertical line.