It is possible in many cities to identify zones with a particular type of land use - eg a residential zone. Often these zones have developed due to a combination of economic and social factors. In some cases planners may have tried to separate out some land uses, eg an airport is separated from a large housing estate.
A good overview of some urban planning models. Interesting that this appeared in a news article in Britain. If we put this in the paper in Australia, would people who don't study Geography understand it?
Via Seth Dixon