In order to solve the problem that traditional Geographic Information System(GIS) can not run well offline, this paper uses native storage and proposes a scheme called quad tree file system, which is based on quad tree index, and it prevents the storage from the shortcoming using windows file system. The main function includes inserting, reading, querying and deleting, it encrypts the data using simple method, which improves the data security. Experimental results show that the scheme is better than Windows file system for storing native data.%为解决传统地理信息系统在离线状态下无法正常运行的问题,设计本地缓存机制,提出一种基于四叉树索引的海量数据储存方案.采用四叉树文件系统管理本地缓存,包括数据的添加、读取、查询和删除,避免传统Windows文件系统储存大量小文件时存在的文件操作耗时长的弊端.实验结果证明,该方案能实现数据加密,提高地理信息数据的安全性,与Windows文件系统相比,更适用于本地缓存.
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