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《Science of Surveying and Mapping》 2011-03
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A quick display technique of navigation digital map

GAO Yang①②,YANG Zhi-qiang①,WU Meng②(①College of Geology Engineering and Geomatics,Chang'an University,Xi'an 710054,China;②Xi'an Surveying and Mapping Institute,Xi'an 710054,China)  
To improve display performance of digital map in vehicle navigation system,this paper discussed organization and extraction techniques of map data.Firstly,a novel data organization method based on"LOD level + hierarchical quad-tree + R-tree"index of three ranks was proposed,and it effectively solved the storage problem of map elements occupying multi-grid.Secondly,a data buffer structure with multi-level and multi-block and the corresponding strategy of data prefetching and update in background thread were introduced,which could greatly improve extraction efficiency.Finally,tests on the practical platform proved that the approach was valid and advanced.
【CateGory Index】: P208
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【Citations】
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