The two-tier Lowry model brings dynamic simulations of population and employment directly into the planning process. By linking regional modelling with neighbourhood design, the framework enables planners to explore how alternative planning scenarios may evolve over time. The upper tier captures regional flows of people, jobs, and services, while the lower tier allocates these to fine-grain zones such as neighbourhoods or parcels. Implemented in CityEngine, the approach allows interactive visualisation and evaluation of multi-scale scenarios. A case study in South Yorkshire (UK) illustrates how regional forecasts can be translated into local design responses, connecting quantitative modelling with 3D spatial planning.

翻译：双层Lowry模型将人口与就业的动态模拟直接引入规划流程。该框架通过将区域建模与社区设计相衔接，使规划者能够探索不同规划方案随时间演变的可能性。上层模型捕捉区域尺度的人口、就业与服务流动，下层模型则将这些要素分配至社区或地块等细粒度空间单元。基于CityEngine平台实现的方法支持多尺度方案的交互式可视化与评估。英国南约克郡的案例研究表明，区域预测结果如何转化为本地设计响应，从而将定量建模与三维空间规划有机结合。