If the Soil Profile option has been enabled, and you are using boreholes to define the soil profile boundaries, then you may select various interpolation options to define how the borehole data will be interpolated to form the profile boundaries.
To access the Borehole Interpolation Settings:
select the Settings button on the Soil Profile page of the Project Settings dialog, OR
you can select the settings button in the Borehole Editor dialog.
You may choose one of the following interpolation methods:
Thin Plate Spline
Local Thin Plate Spline
See the Interpolation Methods topic for more information.
Number of Horizontal Divisions
This determines the number of horizontal divisions used for the interpolation.
Interpolate Top Surface
If this checkbox is selected, then a Soil Profile Boundary will be interpolated through the top point of each borehole. This determines a top surface boundary.
Excavate Above the Top Surface Boundary
If the Interpolate Top Surface checkbox is selected, then this option can be used to automatically excavate any regions above the top surface boundary determined by the interpolation. Any regions above the top surface boundary and within the profile extents, will be excavated.