Lechang a long history, beginning of year 508 county-based system has been 1500 years ago.

乐昌历史悠久，公元508年始设县制，距今已一千五百周年。

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Based on these characteristics, this paper puts forward a comprehensive evaluation criteria system which mainly evaluate the connection and covering level of county road network planning.

针对这一特点，提出一套对县道公路网规划方案进行综合评价的评价指标体系，重点评价县道公路网的连通性和覆盖性。

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In this paper, based on the Sanmen County Geographic Information system, design principles, design objectives, system framework, system functions are described.

本文主要对三门县基础地理信息系统的建设背景、设计原则、设计目标、系统框架、系统功能等进行了阐述。

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