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Semivariance

In spatial statistics , semivariance can be described by

$\gamma(h)=\sum_{i=1}^{n(h)}\frac{(z(x+h)-z(x))^2}{n(h)}$

where z is a data value at a particular location, h is the distance between data values, and n(h) counts the number of pairs of data values we are given, spaced a distance of h apart.

A plot of the semivariance versus distance between data values is known as a semivariogram , or simply as a variogram .

See also: geostatistics, kriging

References

Shine, J.A., Wakefield, G.I.: A comparison of supervised imagery classification using analyst-chosen and geostatistically-chosen training sets, 1999, http://www.geovista.psu.edu/sites/geocomp99/Gc99/044/gc_044.htm

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01-04-2007 01:21:04

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