How Interpolation Settings Work

Some horizon operations and processes use a weighted method to interpolate and extrapolate results. When creating new points, the operations use values from many neighbours. These settings affect how the calculation is performed.

The options (when available) are:

  • Interpolate
    • Fill enclosed holes and missing values
    • Values closer than Max search distance are used in the calculation.
  • Extrapolate
    • Fill all points inside a specified region
    • The closest valid points are used in the calculation. Max search distance has no effect.

Insight determines values for the new points using the max search, spreading, smoothing, strike and dip settings.

Strike and Dip Weighting

Use the strike / dip setting to affect the “shape” of the operation.

  • Increase this value to increase the effect of points in the "strike" direction that you have defined
  • A value of 1 results in a circular weighting function
  • A value of 2 results in points in the chosen "strike" direction having twice as much influence as the perpendicular "dip" points

Specify the "strike" direction (azimuth) in degrees, as measured clockwise from compass north.

Interpolation methods

Insight has two main algorithms for calculating values from neighbours:

Both algorithms use weights when determining the value at a location. Values closest to the location have the most influence on the result.

The spreading and smoothing values control the influence of distant points:

  • Increasing the value reduces the influence of distant points.
  • Use lower values (0.5 to 1) for a smoother result.
  • Use higher values (greater than 1) for a less-smooth result.