UBC Grids

Leapfrog Geo imports UBC grids in *.msh format, together with numeric values in properties files in *.gra, *.sus, *.mag and *.den formats. UBC grids can be evaluated against geological models and interpolants, which can then be exported with the grid.

Importing a UBC Grid

To import a UBC grid, right-click on the Geophysical Data folder and select Import UBC Model. In the window that appears, click Browse to locate the file to be imported. Click Add to add any properties file, although these are not required.

For any properties file, click the Inactive Value field to mark cells as inactive. Doing so does not change the data but ensures that cells with the inactive value can be hidden when the grid is displayed in the scene. If you do not set this value when importing the grid, you can set it later by double-clicking on the grid in the project tree.

Click Import. The grid will appear in the Geophysical Data folder.

Evaluating UBC Grids

UBC grids can be evaluated against geological and numeric models as described in Evaluations. However, UBC grids cannot be evaluated against fault blocks and mutli-domained RBF interpolants, although they can be evaluated against the parent geological model and the parent numeric model.

Mapping Category Evaluations

When a UBC grid is exported with a category evaluation, category data is mapped to an editable numeric value. You can edit this by double-clicking on the grid in the project tree, then clicking on the Export Mappings tab:

Change the numeric value assigned to each lithology, if required. You can also change the value assigned to blocks that have no lithology.

Exporting a UBC Grid

To export a UBC grid, right-click on it in the project tree and select Export. Select the evaluations to export with the grid, then select a folder. Click OK to export the grid.

A UBC grid can also be exported as points to a CSV file. To do this, right-click on the grid and select Export as Points. You will then be prompted to select a file name and location. Once you have clicked Save, select the CSV export options for null values and numeric precision, then click OK.

The CSV file will contain:

• X, Y and Z columns, which represent the centre of each grid block
• I, J and K columns, which is the grid block index. I is in the range 1 to NI, J is in the range 1 to NJ and K is in the range 1 to NK, where NI, NJ and NK are the grid dimensions.
• One or more data columns

 

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