A comprehensive study by  already identified over one thousand 3D city models worldwide.
The discussion on 3D city models is further complicated by the amount of different platforms available for 3D city modeling.
• The ability to approximate 3D buildings using existing models • Accurate, up-to-date, textured 3D (Lo D2) building models — a building shell with roof form and building textures • To provide colleagues and the community with online access to city models • A Web GIS viewer that provided easy-to-use analysis tools, layer control, map sharing, publishing and printing.
AAM NZ agreed to ensure that PCC’s cost objectives were met when delivering their required GIS solution.
In addition to their use in entertainment, they are being applied to visualization in city planning and architecture.
Game engine applications are rarely tied to any geographic coordinate system [15,16,17].
PCC, in consultation with all its relevant stakeholders, determined a number of strategic priorities for Porirua from which several long-term goals were established.
This data enabled the extraction of building models and provided visualisation tools and training required by PCC.During preparation for city development works, PCC identified inaccuracies in their spatial data that restricted planning.PCC’s level of detail (Lo D) building models were outdated and district plans, based on 2D static map outputs, were not interactive and lacked 3D or height enablement of data.Porirua is located on New Zealand’s North Island and is one of the four cities that constitute the metropolitan area of Wellington, the nation’s capital.Porirua City Council (PCC) is the local government agency servicing Porirua and its 55,000 residents.
BIM data is typically exchanged using the Industry Foundation Classes (IFC) standard.