With the ascendance of Google Earth as a mechanism for delivering three dimensional models of cities, it is only a matter of time before web-delivered three dimensional models become an important mirror infrastructure for exploring, using and discussing places. How will these models be built? Who will maintain them? How will the availability of broad-scale urban models change the way we understand the city? This course will involve the exploration of the technical aspects and application of multi-purpose, collaborative urban modeling systems. Please see courseware site for more details.