Path updating method and device
A path update, shortest path technology, applied in special data processing applications, instruments, electrical digital data processing, etc., to reduce the update cost, reduce redundant computing, and improve the efficiency of dynamic update.
Active Publication Date: 2018-01-30
CAPITAL NORMAL UNIVERSITY
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Problems solved by technology
There are some shortcomings in the existing technology such as the triangle heuristic algorithm (A*Landmarks Triangle, ALT). When the updated weight value of a side in the TDN network is smaller than the initial weight value, it is necessary to recalculate the preprocessed data, which will generate a lot of unnecessary update operation
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[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without cre...
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Embodiments of the invention provide a path updating method and device, relating to the technical field of path processing. The method comprises the steps of acquiring multiple landmarks in a time-dependent road network, and constructing a forward shortest path tree and a backward shortest path tree of each of the multiple landmarks according to the time-dependent road network; when it is detectedthat a weight of a side of the time-dependent road network changes, acquiring a forward shortest path tree or a backward shortest path tree of a landmark associated with the side, and updating nodesimpacted by change of the weight in the forward shortest path tree or backward shortest path tree of the landmark associated with the side. Due to use of the structure characteristic of the constructed forward shortest path tree or backward shortest path tree of each landmark in the time-dependent road network, redundant calculation is reduced, the shortest path tree is dynamically updated more efficiently, therefore, update cost of pre-processed data is lowered.
Description
technical field [0001] The present invention relates to the technical field of path processing, in particular to a path updating method and device. Background technique [0002] The shortest path algorithm was born in operations research and computer science, and is a classic algorithm of graph theory. Many practical problems in other fields can be abstracted into the shortest path problem (ShortestPath, SP) in operations research through computer technology such as data structure, such as traffic path planning. The traditional shortest path model is based on the static network structure, that is, the structure of the formalized network graph is known, and the weight of the arc (or edge) is unchanged. However, in the actual traffic road network, the weight of each arc edge will change with time, for example, the traffic capacity and speed of the road will be affected by dynamic factors such as traffic conditions. For time-dependent networks (Time-Dependent Networks, TDN), ...
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IPC IPC(8): G06F17/30G06Q10/04
Inventor 王旭仁许祎娜苏红莉冯安然马慧珍
Owner CAPITAL NORMAL UNIVERSITY