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Type of variogram to be used. Enumeration of available options is;
- exponential Gaussian ;
- Gaussian Exponential ;
- Linear ;
- Spherical ;
- Power ;_power
_
is the correlation coefficient, and 
the distance between parameter pairs.
variogram:nugget
Nugget of the variogram (parameter b in linear type)
variogram:slope
Slope of the variogram. Used for linear variogram types (parameter a).
variogram:sill
Sill of the variogram (for all types except the linear type).
variogram:range
Range of the variogram (for spherical, Gaussian and exponential types only).
numberOfStations
Number of stations to consider in spatial interpolation. Used in Inverse distance when taking a limited number of stations into account. The nearest stations will be used in preference.
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