I think the sheer size and complexity (infrastructures) of futuristic cities is the main reason why there aren't that many maps.

Think about it. A 10 000 people city is quite big for a classic medieval fantasy setting but that's about 1000 building (give or take).
For a modern of futuristic setting, 10 000 people just a common town/outpost.
Imagine you wanted to map a modern city like Paris or New York, we're talking about millions of people, thousand and thousand of buildings...
At this point most people would rather have an abstract representation of the city than individual buildings.

You could still map only portion of the city if that counts.