Split samples suggested that model 4 predicted well, and residual semivariogram
plots did not exhibit spatial autocorrelation.
The ordinary Kriging method using the exponential semivariogram
function was applied to create continuous HSI maps.
a] and TSR (at field scale) was analysed by means of geostatistic techniques (Webster and Oliver 1990) and the form of semivariogram
(Eqn 2) was determined using the following model (Burrough and McDonnell 1998):
05) to meet the normality requirement for semivariogram
modeling and to account for zero values.
Wind speed was converted to m/s and interpolated using an ordinary kriging with a Gaussian semivariogram
model to develop a wind speed map for the entire area of interest.
In this case, the kriging estimator with the Gaussian semivariogram
model yielded the smallest error when estimating groundwater depth.
Initially, a semivariogram
of the soil attributes was generated to check for the existence of spatial continuity.
No anisotropy was evident in the directional semivariograms
of soil K properties; thus, isotropic semivariogram
models were applied to the K data (Table 2).
Too large a search radius will also include data that have no influence on the topography, as shown in the semivariogram
Consequently, the radius of the neighborhood is set equal to the range of the estimated semivariogram
Point kriging with no search radius was used as an unbiased, weighted, linear interpolation method that minimises total parameter variance by incorporating semivariogram
functions to create contour maps (Isaaks and Srivastava 1989).
Starting from the spatial distribution of the market basket value it has been possible to observe the relationship between the price per unit of observations and their location through a linear semivariogram