Hybrid Tracking for Augmented Reality GIS Registration

This paper describes the work to resolve registration problem of Augmented Reality Geographic Information System (ARGIS). ARGIS is composed of AR system and 3DGIS, 3DGIS can provide detailed models and 3D map of the real world for AR system, so ARGIS is actually an outdoor augmented reality system. In this paper, we present a hybrid tracking method for registration in ARGIS, by using data from GPS receiver and inertial sensors, observer position and orientation can be approximately determined in 3DGIS; therefore a 2D screen image can be generated from 3DGIS. This screen image should be similar to real world image taken by a camera at the same position and direction in the real world. Therefore, the main work of the registration in ARGIS is to match real image with screen image. We introduce virtual marks to make the match result to be stable and fast, and accordingly to realize precise registration. Experiment shows that the method is efficient and promising.