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Delete Bottom Elevation

The Delete Bottom Elevation tool is used to clear the bottom elevation of the nodes within a defined area or in the gridline.

To view the bottom elevation of grid nodes, select the grid layer in the Layer Control, then RMC to display options, and select Show Labels / Bottom Elevation as shown in Generate Grid's Elevation from Cross-section#Figure 1. The bottom elevation values of nodes is then displayed. The following steps describe how to remove the bottom elevation of selected grid nodes.

  1. Select the grid layer in the Layer Control by LMC on that grid layer
  2. Set the mouse in the selection mode, hold the Shift key and LMC on two grid nodes either on the same grid line segment or different gridline segments. The grid block will be highlighted.  Next, release Shift, then RMC to show options, and select the Delete Bottom Elevation, as shown in Generate Grid's Elevation from Cross-section#Figure 2. As a result, the bottom elevation of nodes will be removed.
  3. To update the view of the bottom elevation of grid nodes after using the Delete Bottom Elevation, select show labels for bottom elevation as mentioned in Generate Grid's Elevation from Cross-section#Figure 1, the grid nodes whose bottom elevation has been removed will display as NaN labels as shown in Generate Grid's Elevation from Cross-section#Figure 3.


Figure 1  Show bottom elevation labels of grid nodes.


Figure 2  Delete Bottom Elevation option.




Figure 3  Bottom Elevation labels of grid nodes after using the Delete Bottom Elevation option.


Modify Bottom Elevation

The Modify Bottom Elevation option is used to change the bottom elevation values of nodes in the defined area. The steps to define the selected gridline or grid bock are similar to the Delete Bottom Elevation option described above. After defining the impacted area, RMC to display options, and select the Modify Bottom Elevation as shown in Generate Grid's Elevation from Cross-section#Figure 4. The Modify Selection form will display as shown in Generate Grid's Elevation from Cross-section#Figure 5. The radial options of this form are described below.

Assign a Constant Value: Select this option, enter a constant value in the Value field then click the Apply button will assign that value to all nodes within the grid bock. The value displayed in the Average field is the initial averaged value calculated from the nodes within the grid bock.

Add a Value To: Select this option, enter a constant value in the Value field then click the Apply button will add a value to each existing value of nodes within the grid bock.

Subtract a Value From: This option is the opposite to the Add a Value To option.

Multiply with a Value: Select this option, enter a constant value in the Value field then clicking the Apply button will multiply the bottom elevation value of each node within the grid bock with a value.

Divide by a Value: This option is the opposite to the Multiply with a Value option.

Delete Selected Values: This option will remove the bottom elevation values from the selected nodes. It works like the Delete Bottom Elevation option that is described above.

Apply: Click this button to proceed with the radial option.

Close: Click this button to close the form.

Cancel: Click this button to cancel option selection, even clicking the Apply button previously.




Figure 4 A Modify Bottom Elevation option.


Figure 5  Modify Selection form.

Interpolate Bottom Elevation in I- or J-Direction

Sometimes a grid will have nodes that have different values for bottom elevation, and are some nodes are without bottom elevation values (NaN represents missing values) as shown in Generate Grid's Elevation from Cross-section#Figure 6. This option is used to interpolate and fill the bottom elevation in the I direction of the selected nodes. Displaying the I,J indices in advance helps to define which one is I or J direction. 



Figure 6  Show bottom elevation labels of a grid.

Figure 7  Bottom elevation labels of a grid after using Interpolate Elevation in I-Direction option.

Extent Bottom Elevation in I- or J-Direction

This option extents the first or last data points to fill the missing data. For filling missing data between grid points, please use the Interpolation Elevation in I-Direction or in J-Direction.

Create XYZ Data from Block

After defining a grid block, then RMC display options as shown in Generate Grid's Elevation from Cross-section#Figure 8, select Create XYZ Data from block option to create an XYZ layer in the Layer Control. This contains the coordinates and elevation of nodes and displays as points, as shown in Generate Grid's Elevation from Cross-section#Figure 9. To export this layer to an external file, RMC on the layer then select Export Data Points option.

Figure 8  Create XYZ Data from Block option.


Figure 9  Generated XYZ layer.






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