| 网络地图缓存技术研究与应用进展 |
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| 引用本文： | 张晋文,周艳兵,刘小生.网络地图缓存技术研究与应用进展[J].测绘与空间地理信息,2015(8). |
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| 作者姓名： | 张晋文 周艳兵 刘小生 |
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| 作者单位： | 1. 江西理工大学建筑与测绘工程学院，江西赣州341000; 北京农业信息技术研究中心，北京100097;2. 北京农业信息技术研究中心，北京100097; 中国矿业大学 北京 地球科学测绘工程学院，北京100083;3. 江西理工大学建筑与测绘工程学院,江西赣州,341000 |
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| 基金项目： | 国家科技支撑计划课题(2013BAJ05B01)；江西省科技计划项目(20142BBE50024) |
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| 摘 要： | 随着网络地图服务应用的延伸及并发访问数不断增加，网络地图服务平台的性能需求越来越高。地图缓存技术有效地减轻了服务器计算负载和网络传输负担，极大地改进了客户端和服务器端的交互效率，提升了网络地图服务应用水平，改善了客户端用户体验，是网络地图服务领域的研究热点之一。但其仍存在地图缓存制作时间长、占用空间大以及瓦片数据更新困难等技术难点。本文通过对目前主流的研究成果进行整理与归纳，重点分析了地图缓存技术各个环节的研究内容和现状以及分布式环境下的地图缓存技术研究进展，挖掘出了地图缓存技术在静态缓存瓦片数据更新、静动相结合的缓存策略切换、按需切图响应效率优化、文件系统与数据库组织模型同步、混合模式存储设计、大范围瓦片数据更新以及分布式环境下的地图瓦片数据弹性存储等方面可进一步提升的研究内容和技术环节，期望为后续的研究提供参考。
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| 关 键 词： | 网络地图服务 地图缓存技术 地图瓦片 分布式缓存 |
A Research Review of Map CacheT echnology Based on Web |
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| Abstract: | Absrt act:The performance demands of web map service platform are higher and higher, with the number of concurrent access for web map service increasing.Map cache technology cuts map into certain specification pictures according to the mathematical rules in ad-vance and saves the map tiles to the map servers, map servers quickly return titles corresponding to the current area according to the request parameters, so that it can achieve dynamic display effect using static images.Map cache technology is one of the hot spots in web map service areas, effectively reducing the server computing load and network transmission burden, greatly improving the interac-tive efficiency of client and server, enhancing the application level of web map service and improving the experience of client users. But there are still some technical difficulties to be solved, such as it takes a long time to make map tiles, a large number of map tiles data occupy a lot of space, it is very difficult to update the map cache data and so on.In this paper, we dig out the researches and technical aspects can be enhanced for map cache technology in updating the static cache tiles data, switching the cache strategy com-bined with static cache strategy and dynamic cache strategy, optimizing the cutting response efficiency of map cache on demand, de-signing the mixed storage mode, updating a wide range of tiles data, syncing the file system organization model and database organiza-tion model, storing the map tiles data elasticity under distributed environment, and hope to provide a reference for the future studies, with collating and summarizing the current mainstream researches, emphatically analyzing the researches and research status of map cache technology in all aspects and distributed environment. |
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| Keywords: | web map service map cache technology map tiles distributed map cache |
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