Featured Statistics in GS⁺

Spatial Autocorrelation Analysis

• Semivariance Analysis, including

  • Isotropic and anisotropic (direction-dependent) variograms
  • 4 types of isotropic and anisotropic variogram models
  • Automatic model fitting, and / or user-specified
  • Anisotropy maps, for quickly identifying anisotropy
  • h-Scattergrams and Cloud variograms, for finding variogram outliers fast
• Other autocorrelation measures
  • Correlograms
  • Drift
  • Covariograms
  • Rodograms
  • Madograms
  • Standardized Variograms
  • General Relative Variograms
  • Pairwise Relative Variograms
  • Moran's I
  • Fractal Analysis
• Cross-variogram analysis, for covariate analysis prior to co-kriging
• Full control over lag class (separation distance) intervals and extent

Interpolation

• Kriging, for optimal interpolation based on spatial dependence
  • Ordinary kriging, with External Drift and with Polynomial Trend
  • Block kriging, for interpolating a discrete area around interpolation points, and Punctual kriging, for interpolating discrete points
  • Simple kriging
  • Indicator kriging
• Cokriging (both block and punctual), for more precise interpolations when a covariate is present
• Conditional Simulation
• Inverse and Normal Distance Weighting for classic nearest neighbor analysis
• Cross-validation and Jackknife Analysis, for comparing interpolated to known sample values
• Polygon masks of unlimited number and complexity
• Interpolation grids of any size
• 1d interpolation for temporal (time) data and linear transects
• Output compatible with ArcView^® and other GIS and mapping programs (e.g. Surfer^®)

Parametric Statistics

• Sample means and variance
• Skewness and kurtosis, for determining departure from normality
• Frequency distributions
  • Normal probability plots
  • Cumulative frequency plots
  • Frequency histograms
• Transformations for returning the data to normality
• Quantile scattergrams, to display values for sampled locations
• Regression analysis (variate vs. covariate)

Mapping

• 2d and 3d projections of maps
• 1d graphs for transects and temporal data
• Maps of kriging estimation error
• Data postings
• Full control of size, axis labels, colors, contour intervals
• Rotation and zooming

Data Handling

• Integrated data worksheet
  • Huge data capacity – up to 2 billion records x 64 fields / columns
  • Assign x, y, z, z2 columns easily among 64 possible columns
• Flexible input formats
  • GeoEas, ArcView^®, Surfer^® formats
  • Excel^®, DBase^®, Access^® files
  • ASCII text files in user-defined format
• Flexible output formats
  • GS+, ArcView^®, Surfer^®, and GSLib interpolation output formats for mapping
  • Graphics printed to any Windows device in JPEG, GIF, PNG, or wmf graph output formats
• Missing values
  • Permanent missing values handled gracefully
  • Temporary missing values toggled on and off by user
• Data filter to exclude data ranges

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