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Multiple layers in graphs or vector maps are a general case but complicated network in various applications. The classical shortest path algorithm, such as the Dijkstra's algorithm, can not be applied to the multiple layers directly. A new shortest path approach for multiple layers of graphs or vector maps was proposed in this paper. Firstly, the multiple layers should be overlaid with an improved...
It is one of important algorithms to calculate intersection, union and difference between two polygons in computer graphics and also the kernel approach of spatial overlay analysis in geographic information system (GIS). The operating efficiency and ubiquity are directly influenced by the optimizing algorithm. Firstly, an efficient algorithm for intersection, union and difference between two convex...
Routing protocols are designed under the assumption that each node in a network should be able to reach (i. e. send or forward packets to) every other node in the network. Unfortunately, adopting this assumption in a routing protocol does allow adversary nodes to launch spam or DoS attacks against the other nodes in the network. In this paper, we introduce the "blocking option" in routing...
Georeferencing is a key component in GIS systems. However, its performance has been dragged by the manual georeferencing process. In this paper, we develop a scalable and error tolerant automated georeferencing scheme for general affine transformations called localized matching and global optimization (LM-GO). Under LM-GO, the complexity of control point pair (CPP) matching is not directly tied to...
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