https://phys.org/news/2018-07-city-lost.html

SAP is a Bluetooth Low Energy (BLE) proximity sensing device that stores a unique geo-coded Smart Address ID of a building, shop or office associated with it. When a user is within the confidence range of the , the user will know its exact location, and can reach its final destination guided by the app.

Professor Yeh believes it is important for every building in Hong Kong to have a unique Smart Address ID. One easy way is for buildings to be assigned with a unique geo-coded address ID that can be positioned on a digital map. Professor Yeh's team has developed a new postal-building Smart Address Coding System for all buildings in Hong Kong by combining a new postal code with the global georeferenced coordinates of a building. Shops, offices, and car parks in a building can be tagged to this postal-building Smart Address for use in navigation, positioning, delivery, management and big data.