Simple external drift kriging question
Hi Chris, Am 07.03.2011 17:44, schrieb CC Greene:
Hello, I am new to geostatistics. I was hoping someone could answer the following question: When trying to do external drift kriging, I understand that you create the variogram from the residuals. Then, my question is when you actually do the kriging, do you interpolate the residuals and add them to an ordinary kriged field?
The residuals, that are interpolated by kriging, are added to the values obtained from interpolation via regression. The gstat package does this for you if you specify an independent variable e.g. in gstat() or krige().
Or, can one just take the variogram derived from the residuals and apply it to the raw data when kriging.
No, as the variogram derived from the residuals does only represent the spatial dependence in the residuals, not the raw data. regards, Tom
Thank you for your time and a simple response. Chris [[alternative HTML version deleted]]
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