A Multi-scale Road Visualization Method in Navigable Database

In order to provide users with the function of navigating across different details of level, ranging from overview screen to detailed views, it is necessary to display these representations with different detail levels at a successive and smoothly transformation order, the existing methods for multi-scale visualization are integrated and extended in the paper, and a new method, named as ‘object interpolation’ is proposed, which describes the method and process that deriving the object at a middle scale from the representation objects at the larger and smaller scales. In the context, and the interpolation principle, overall framework and technical flow are put forward. Then, the object interpolation function is defined and described, which reflects the inheritable and transferable characterizes of quantitative, structural, geometrical, semantic, topological and attribute related information among multi-scale representation objects. At last, a case in point is given to indicate that the new method is a guarantee for multi-scale visualization to objective selection of the road objects at middle scale.