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Because moving objects usually move on spatial networks, efficient trajectory index structures are required to achieve good retrieval performance on their trajectories. However, there has been little research on trajectory index structures for spatial networks, like FNR-tree and MON-tree. But, because both FNR-tree and MON-tree store the moving object's segment, they can not support a spatio-temporal...
GML (Geographic Markup Language) is a markup language presented as exchange standard for geographic information by the OGC (Open GIS Consortium). In spatial network databases, studies on GML can be divided into parsing, storing and retrieval of GML documents. Among them, the storage of GML documents is essential for their efficient retrieval. However, there is little research on storing GML documents,...
In this paper, we propose new query processing algorithms for typical spatial queries in SNDB, such as range search and k nearest neighbors (k-NN) search. Our two query processing algorithms can reduce the computation time of network distance between a pair of nodes and the number of disk I/Os required for accessing nodes by using a materialization-based technique with the shortest network distances...
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