基于LRS与GDF的移动对象轨迹建模及索引*

针对当前基于受限网络的移动对象管理研究中道路网模型简单，以及以空间平面坐标表达移动对象位置的方法不适合于道路网应用的问题，采用交通应用中流行的GDF路网模型并结合线性参考系统设计了一种针对道路网络的移动对象索引模型。与FNRtree及相关改进的索引方法相比，该方法在移动对象位置更新及添加上有更高的效率，在相关查询上结果更加合理。

Modeling and indexing moving objects trajectories based on LRS and GDF

Many models have been proposed to index moving objects trajectories on fixed network currently. Most of these models use the euclidean x,y coordinate to describe the moving objects position and build the index on the simple center line based network. Because these methods neglect the spatial relation between the moving object and the road network, and the inherent complexity of the road network, they have many limitations in perform the queries efficiency. The paper proposed a new index model based on the linear reference method and geographic data file (GDF). It gets a better performance in the position renew and adding. It also contributes to get more reasonable query result.