Site and building directories and navigation

Many of us have an intuition that we should be able to extend the technical and commercial success of road navigation in large geographic spaces to smaller spaces such as parks, shopping malls, business estates, airports, train stations, crime scenes, disaster sites, and individual buildings. Designing real applications leads to three key technical and business questions: • "What are the requirements?" There are clear differences in comparison with road navigation. Smaller spaces have a human-scale level structure embedded in 3-dimensional space. Visualisation and analysis can be as important as navigation itself. Does the turn-by-turn guidance model still make sense? • "Where do models come from?" Smaller spaces have complex structure that are complex and can change frequently. Multiple sources inevitably have semantic and quantitative inconsistencies. How do you find content? How do you integrate content? How do you update content? • "How do you locate a mobile device in smaller spaces?" Compared to road navigation, the precision requirements are tighter, the difficulties in radio propagation are extreme, and level information within structures is essential. Consideration of these questions in a practical application at the Italian fire training centre at Montelibretti provides some answers.