I do work for The Canadian Real Estate Association doing web and sometimes I get to do my illustrator thing.
Mostly Illustrator vectoring buildings the with some Photoshop to fade and blend, I work the pieces into shape and then into place. The maps were all redrawn in vector to allow for easy perspective adjustments as smart objects in Photoshop assembly. This one is no longer used, but was on the footer of the realtor.ca site for a couple of years. It repeated along the bottom edge to allow for larger screens. It was dropped with the new 6.0 version of REALTOR.ca, but had over 2 years of exposure.
It was re-purposed for a blog on the NEWS2Me newsletter, entitled “Let it Shine”, with glowing pushpins.