AI-GEOSTATS: Re: co-kriging on data with spatial trends
Calculating of cross semi-variograms has to be done on
residuals if there is a trend, just like any single
variable semi-variogram. You might find our MUCK
papers useful, as we were co-kriging two variables
both with trend back when we first started in the
1980s. You can find our papers at
(note the capital P).
Your other question about search radii. When trend is
present, you need to enlarge your search radius past
the range of influence to get enough samples to
condition the equations properly - that is, to solve
for the trend as well as the weights. You can see how
this works with uor kriging game, free to all at
Hope this helps
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