How hard would it be to make a "power map"?

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Hi all

I'm currently spending a few minutes here and there every day for the
last few months on this huge map-of-europe game, playing solo,
interrupted only by barbarians.  Unfortunately I don't bother properly
defending *all* my cities, so the barbs by now have stolen Amphibious
Warfare from my cities. (*)

I'd like to avoid losing yet another city to them before they start
nuking me.  :)

So my question is, how hard would it be to build a "power map" so I can
quickly see where my weak spots are?  I'm imagining some sort of map
that maintains the total damage that can be inflicted on any given
square *immediately* (same turn).  Basically, the result I want is a
"mode" for the minimap that shows me (in red) all the squares that are
*not* immediately reachable by any of my bombers, nukes and armors.

The naive approach I imagine is to loop over all tiles, and over all
units, and add up all the attack values each can inflict.  But that's
just, erm, naive.

Maybe rather do a global reachability map that divides the map up into
"military continents", taking into consideration such things as
railroads, which give free movement, just to avoid looking at *all*
squares individually.

Would this be better done in the server, or could it just as
easily/hardly be done in the client?

Hmm, just wondering.

bernd

P.S. If you're wondering, the date is 2687AD, population 535 million on
the 200x100 europe map.
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