By default, Surfer uses the first Z value when there are multiple Z values at an XY location. This is called a duplicate. However, you have the opportunity to change how Surfer handles duplicates in the Grid Data dialog.
- In the Grid Data dialog, click the Filter Data button.
- In the Duplicate Data section of the Filter dialog, choose the desired setting in the To Keep field.
- Click OK.
Updated October 16, 2018