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A number of geographic sampling procedures have been developed to optimise the precision of the estimates in the presence of spatial autocorrelations. Most variables observed in a geographic area have a spatial autocorrelation which is high at short distances and decreases when the distance becomes larger. The efficiency of sampling areas is improved when the distance between two elements of the sample is not less than a certain threshold. Applying this restriction can induce a significant perturbation of the sampling probability, especially near the borders of the region. In the case of aligned sampling by repetition of a pattern in a square block, a distance threshold does not modify the marginal probability of each element of the population, although crossed probabilities are slightly changed.

Additional information

Authors: GALLEGO F J, JRC Ispra (IT);FUENTES M, University of Chicago, Department of Statistics (US)
Bibliographic Reference: Article: Quaderni di Statistica e Matematica Applicata (1995)
Record Number: 199511317 / Last updated on: 1995-10-31
Original language: en
Available languages: en