To Smooth a Surface Using the Natural Neighbor Interpolation (NNI) Method

1. In Toolspace, on the Prospector tab, expand the surface Definition collection, right-click , and click Smooth Surface.
2. In the Smooth Surface dialog box, for the Select Method property, select Natural Neighbor Interpolation.
3. In Point Interpolation/Extrapolation Output, select the one of the Output locations: Grid Based, Centroids, Random Points, or Edge Midpoints. For more information, see
4. Depending on the location you selected, specify values:
   • Grid Based: Specify values for the output regions, grid spacing, and grid orientation properties.
   • Centroids: Specify the value for the output region.
   • Random Points: Specify the value for the output region.
   • Edge Midpoints: Select the triangle edges. Requires that surface triangles be displayed.
   Note: For more about these options, see About Point Interpolation/Extrapolation Output for Surface Smoothing.
5. Click OK to smooth the surface.

   The operation is added as a Smooth Surface item to the Edits list view in Prospector.

   Note: The Description column in the list view displays the type of surface smoothing that was used (Kriging Smoothing or Natural Neighbor Smoothing).