Variogram : summarises the relationship between the variance of the difference between measurements and the distance of the corresponding points from each other.
Kriging : uses the information from a variogram to find an optimal set of weights that are used in estimating a surface at unsampled locations.
Note : Kriging is named after D.G. Krige, a South African mining engineer and a pioneer in the application of statistical techniques to mining investigations.
Sill : describes where the variogram develops a flat region, i.e. where the variance no longer increases.
Range : the distance between locations beyond which observations appear independent i.e. the variance no longer increases.
Nugget variance : when the variogram appears not to go through the origin.
Variogram analysis 12.11.97 Page : Glossary |
|