Point out the two phases when public participate in the urban planning decision - making , one is " the phase of decision - making scheme collecting which mainly work is collecting the feedback of discussion and advice from public " , the other one is " the phase of decision - making scheme creating which mainly work is selecting the expert evaluation scheme optimizing " 。 （ 3 ） in this paper , the author presents the architecture of ppgis suiting for urban planning and divides it into four tiers : data tier , middle tier , presentation tier and user tier 指出公众参与到城市规划决策中分为两个阶段， "以公众讨论和发表意见反馈为主的决策方案征集阶段"和"以专家评估方案选优为主的决策方案生成阶段" 。 （ 3 ）提出了适合于城市规划的ppgis体系结构，并且确定为四层体系结构，即数据层、中间层、展示层和用户层。数据层为规划过程需要用到的各种数据；中间层为用于规划和协同决策的各种组件和平台；展示层为人机交互界面；用户层为系统的用户和参与者。
