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>Mapping by means of geostatistics and fuzzy geostatistics-a comparison using sulfate concentration distributions in a near-surface aquifer north of Bremen [Kartenerstellung mit Geostatistik und Fuzzy-Geostatistik: Ein Methodenvergleich am Beispiel der Verteilung der Sulfatkonzentrationen im oberfl?chennahen Grundwasserleiter in Bremen Nord]
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Mapping by means of geostatistics and fuzzy geostatistics-a comparison using sulfate concentration distributions in a near-surface aquifer north of Bremen [Kartenerstellung mit Geostatistik und Fuzzy-Geostatistik: Ein Methodenvergleich am Beispiel der Verteilung der Sulfatkonzentrationen im oberfl?chennahen Grundwasserleiter in Bremen Nord]
In order to visualize sulfate contents distributions in near surface groundwater north of Bremen, maps were regionalized by Ordinary Kriging, Fuzzy Kriging and the Natural Neighbor method and compared with a conventionally provided distribution map. The computations were made with uniform parameters and a uniform raster grid. The original data sets contained fuzzy data of sulfate concentrations like "<40 mg/l", which were used in different variants for the interpolation. The regionalization of the sulfate concentrations by Ordinary Kriging shows-depending on the conversion of these values-strongly smoothed results, particularly within the range of locally arising concentration maxima in the southern investigation area. In comparison, the maps by Fuzzy Kriging and the Natural Neighbor method identified high concentration gradients much better. The Fuzzy Kriging approach links the quality of a geostatistical method with the possibility of dealing with imprecise data, and is therefore preferred in comparison to the other methods.
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