Intelligent urban positioning (IUP) combines multi-constellation GNSS with 3D mapping and potentially other sensors to achieve more accurate and reliable positioning in places where large buildings block and reflect a lot of the GNSS signals. There are many different ways of realising the IUP concept. Under the Intelligent Positioning for Cities (IPC) project, we are investigating a combination of GNSS shadow matching and conventional GNSS ranging with terrain height aiding. In addition, we will explore the use of 3D mapping to make the conventional ranging-based GNSS solution more resilient against NLOS reception and possibly multipath interference. Testing will be conducted with geodetic, consumer and smartphone receivers under a range of different user scenarios and environments. Preliminary activity started: 2012. Project duration: 2014-2017; Sponsor EPSRC, Researcher: Dr Mounir Adjrad