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http://dx.doi.org/10.7848/ksgpc.2013.31.5.365

Improvement of Partial Update for the Web Map Tile Service  

Cho, Sunghwan (Seoul National University Engineering Research Institute)
Ga, Chillo (Seoul National University Engineering Research Institute)
Yu, Kiyun (Department of Civil & Environmental Engineering, Seoul National University)
Publication Information
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography / v.31, no.5, 2013 , pp. 365-373 More about this Journal
Abstract
Tile caching technology is a commonly used method that optimizes the delivery of map imagery across the internet in modern WebGIS systems. However the poor performance of the map tile cache update is one of the major causes that hamper the wider use of this technique for datasets with frequent updates. In this paper, we introduce a new algorithm, namely, Partial Area Cache Update (PACU) that significantly minimizes redundant update of map tiles where the update frequency of source map data is very large. The performance of our algorithm is verified with the cadastral map data of Pyeongtaek of Gyeonggi Province, where approximately 3,100 changes occur in a day among the 331,594 parcels. The experiment results show that the performance of the PACU algorithm is 6.6 times faster than the ESRI ArcGIS SERVER$^{(r)}$. This algorithm significantly contributes in solving the frequent update problem and enable Web Map Tile Services for data that requires frequent update.
Keywords
Cache Update; Web Map Tile Service; Data Structure; MBR;
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