Abstract
Routing system has been implemented in the outdoor routing and the indoor routing. There are significant differences that make indoor routing is more complex than outdoor routing, which is the outdoor routing implements two dimensional spaces, while at the indoor routing allows the routing of the three dimensional spaces that represent multi-level building. This research concern about the prototype development of the inter-building routing system. The construction of this prototype needs to consider both outdoor and indoor routing. Shortest path algorithms could be implemented after the construction of three dimensional spaces spatial data structure in order to inform the users about the shortest route between two points in indoor spaces.