Does anyone know where you can find proper maps - as close to street level as possible for the local calling areas within NZ?

A number of companies say they follow the Telecom NZ Standard Local Calling areas as their own, but they dont give any more detail other than that, and telecom's website isnt very detailed other than allowing you to check what calling areas are around you based on a telephone number you supply it. Not an auctual map of where you can call.

Vodafone has a simple map but its not very detailed when you try to zoom in.