According to the design principle of the map symbol, design the travel map symbol and visual function, the scheme of the symbol data store reference and network performance.

根据地图符号的设计原则，设计旅游地图符号及可视化功能，旅游符号数据存储和索引方案及网络性能优化方案。

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Network technology provides effective reference data for the measuring problem. Based on the statistical analysis of the measured data we can make whole operation for the network.

网络测量技术为这些问题的解答提供了有效的参考数据，并能够提供网络总体运行的相关数据。

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There is great obstacle for users to look up reference under network environment, therefore, professional library should develop characteristic data base vigorously.

网络环境下用户检索存在着巨大障碍，专业图书馆应大力发展特色数据库。

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