1983年，西雅图市地理信息系统开始由市长办公室和市议会授权的工程、水利和城市照明部门合作。从整个城市的项目开始，西雅图水务局（SWD）一直是联合自动制图项目（JAMP）的政策监督、技术和资金组成部分的主要贡献者。由于社署本身的数据库将建立在中央地理数据库（CGDB）的空间框架之上，因此，该基础地图的妥善准确维护与社署关系重大。路权、路权控制线、法定地块线和地块边界底图要素用于参照水设施偏移标注。社会福利署地理信息系统的设计、开发和实施遵循结构化系统开发方法。 这种方法产生了一种内在稳定的数据模型，能够自然地演化以满足未来应用的需求。本文描述了每个阶段。

In 1983, the City of Seattle GIS began with a cooperative effort between the Engineering, Water, and City Light Departments that was mandated by the mayor's office and city council. From the beginning of the city-wide project, Seattle Water (SWD) has been a major contributor to the policy oversight, technical, and funding components of the Joint Automated Mapping Project (JAMP). The SWD has a significant stake in the satisfactory and accurate maintenance of the base map since its own database will build upon the spatial framework of the Central Geographic Data Base (CGDB). Rights-of-way, rights-of-way control lines, legal lot lines, and parcel boundary base map features are used to reference the water facilities offset dimension. The design, development, and implementation of the SWD GIS followed a structured systems development approach. This approach resulted in an inherently stable data model that will be able to evolve naturally to meet the needs of future applications. The paper describes each of these phases.