From Information Asthetics:
Station Maps [aeracode.org] by programmer Andrew Godwin contains a large collection of browser-based (HTML5) 3D maps depicting different London Underground/DLR stations.
Most of the stations are modelled from memory in combination with a few diagrams found online. This means that the models are not totally accurate, but they should represent the right layout, shape and layering of the stations.
Every map has some underlying structure/ontology onto which other information is added.
Real time merging of train, security camera, security forces, event, etc., information onto such maps is one aspect of merging based on location/interest. Not all information is equally useful to all parties.