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	Ordinary Kriging	Universell kriging (Kriging med en trend)
Ämnesområde	Rumslig analys	Rumslig analys
Familj	Regression model	Regression model
Ursprungsår	1963	1969
Upphovsperson	Georges Matheron (formalising D.G. Krige's empirical work)	Georges Matheron
Typ	Geostatistical interpolation	Geostatistical interpolation with spatial trend
Ursprungskälla	Matheron, G. (1963). Principles of geostatistics. Economic Geology, 58(8), 1246-1266.	Matheron, G. (1963). Principles of geostatistics. Economic Geology, 58(8), 1246–1266.
Alias	OK, kriging interpolation, geostatistical interpolation, BLUE spatial predictor	kriging with a trend, kriging with drift, trend kriging, evrensel kriging
Närliggande	4	3
Sammanfattning	Ordinary Kriging (OK) is the standard geostatistical method for interpolating a continuous spatial variable at unsampled locations. It derives optimal, unbiased weights from the spatial covariance structure of the data, making it the Best Linear Unbiased Predictor (BLUP) under stationarity assumptions. Unlike simpler distance-based methods, it also provides a prediction uncertainty (kriging variance) at every interpolated point.	Universal kriging generalizes ordinary kriging to data whose mean varies systematically across space — a spatial trend or 'drift'. It models the mean as a function of the coordinates (or covariates) and krigs the residuals, so it can interpolate variables that drift in a preferred direction, such as temperature falling with latitude or a pollutant gradient, while still returning prediction variances.