Case Study: Nitrates around Phoenix

Making the maps:

• Here is the Purpose of the Study.

• We started with ground water chemical data (for example, this nitrate data ), well samples provided us by a variety of governmental agencies.

• We compared methods of mapping, for example

  kriging, multiquadric interpolation, the "black-box" routine provided with GRASS, a software package just made for maps.

• The method which ultimately won was cokriging . It had the best cross-validation results .

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