Does the AI search for resources or does it instantly know where they all are?

What specifically goes into calculating a plot's fertility value?

When people say that the "AI knows where all resources are," what they're likely referring to is the city placement AI.

What explanation can you provide for some of the more dubious settling locations, sites which only seem to be worthwhile in hindsight, once industrial and modern era techs have revealed additional resources. In particular, some of the tundra junk the AI is prone to settling.

The other element (similar to confirmation bias) is remembering AI from previous Civ titles. It was/is well known that the Civ 3 AI could see all the strategic resources on the map, even those for which it did not have the tech. I've caught myself making the same assumptions about the Civ 4 and Civ 5 AI, when those who have read the code could tell me that I'm mistaken.
 
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