3D Trend
You can use the 3D Trend transformation to remove a 3D trend from your data, in other words to 'de-trend' your data in all directions.
Parameters
Upon selecting 3D Trend, the parameters sections is populated with the following options:
Trend property Select the property that you want to use to de-trend your data.
Trend line polynom degree You can apply a polynomial degree if your data displays a non-linear relationship.
Trend line This field shows the function of the trend line (polynom). To edit the function, click on the blue pencil icon 
. This will open the Edit Trend Line form. To undo any changes you make with the Edit Trend Line form, click the Undo icon 
.
The cross plot at the right-hand side of the form displays the values of all data points versus their projected position on the trend line.
Click Apply or OK to de-trend the data before you execute a modeling run for the selected VOI.