@MISC\{IMM2009-05177,
    author       = "A. A. Nielsen",
    title        = "Geostatistics and Analysis of Spatial Data",
    year         = "2009",
    month        = "oct",
    pages        = "7",
    publisher    = "Informatics and Mathematical Modelling, Technical University of Denmark, {DTU}",
    address      = "Richard Petersens Plads, Building 321, {DK-}2800 Kgs. Lyngby",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/5177-full.html",
    abstract     = "This note deals with geostatistical measures for spatial correlation, namely the auto-covariance function and the semi-variogram, as well as deterministic and geostatistical methods for spatial interpolation, namely inverse distance weighting, radial basis functions (RBF) and kriging. Some semi-variogram models are mentioned, specifically the spherical, the exponential and the Gaussian models. Equations for simple and ordinary kriging (OK) as well as {RBF} interpolation are deduced. Other types of kriging are mentioned, and references to international literature, Internet addresses and state-of-the-art software in the field are given. A very simple example to illustrate the computations for {OK} and a more realistic example with height data from an area near Slagelse, Denmark, are given. A series of attractive characteristics of kriging are mentioned, and a simple sampling strategic consideration is given based on the dependence of the kriging variance of distance and direction to the nearest observations."
}