In step 3 above, we mentioned spatial interpolation. To understand this issue,
it is important to note that sea surface temperature is a property that occurs
everywhere in the ocean, and not only at the buoys where measurements are
taken. The buoys only provide a set of sample observations of sea surface tem-
perature.We can use these sample measurements to estimate the value of SST in
places where we have not measured it, using a technique called spatial interpola-
tion. The theory of spatial interpolation is extensive, but this is not the place to
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