Semivariograms
Originally posted by Dan on 16:12 Mon 7 May 2007, last modified 02:26 Thu 17 May 2007.
File under: curve fitting geostatistics math maximum liklihood phd programming python spatial analysis
Many spatially distributed data exhibit anisotropic spatial variation, especially when the data are distributed over a large area. The Semivariogram, or commonly (and inaccurately) just variogram is a measure of spatial correlation. It simply plots the semivariance (which is half the variance) of two points separated by a vector h against the magnitude of h. Easy right? Well there is a little bit more to it...