Universal Kriging Interpolation

Feature Description

  • The Universal Kriging method requires data to conform to the assumption of normal distribution.
  • Universal Kriging is one of the commonly used Kriging interpolation methods, assuming the expectation (mean value) of the interpolated field variable is unknown.
  • Universal Kriging assumes the presence of dominant trends in sample data that can be fitted using deterministic functions or polynomials. When applying this method, the data trend must be identified before performing interpolation analysis.

Feature Entry

  • Spatial Analysis Tab->Raster Analysis Group->Interpolation Analysis->Universal Kriging.
  • Toolbox->Raster Analysis->Interpolation Analysis->Universal Kriging.

Parameter Description

Fixed Count: Uses a fixed number of sample points within maximum radius for interpolation.

Fixed Radius: All points within search radius participate in interpolation.

Semivariogram: Supports Spherical, Exponential and Gaussian models. Default is Exponential.

Rotate: Counterclockwise rotation angle of search neighborhood relative to horizontal. Default 0°.

Order: Polynomial order of trend surface equation (1st or 2nd order).

Sill: Semivariogram's plateau value where it stabilizes. Default 0.

Range: Distance where semivariogram reaches the sill. Default 0.

Nugget Effect: Semivariogram value at h=0. Default 0.

For parameter relationships see: Kriging Interpolation.

  • Set common parameters for interpolation analysis including datasource, bounds, result data and environment settings. For parameter details see: Common Parameter Description.
  • Set sample point search method. Supports both Fixed Count and Fixed Radius. Detailed explanations see: Kriging Interpolation.
    • Maximum Radius: Input radius value for fixed count. Default is 0 (uses maximum radius search).
    • Number of Points: Input point count for fixed count. Default is 12 points.
    • Search Radius: Input search radius. Default is 1/5 of the longer side length of dataset extent.
    • Minimum Points: Input minimum required points. Default is 5. The radius expands until containing specified minimum points (max 12).
  • Other Parameters: Include semivariogram, rotation angle, order, sill, range, nugget effect, etc.