Abstract Spatial system dynamics (SSD) models are typically implemented by linking stock variables to raster grids while the use of object representations of human artefacts such as buildings or ownership has been limited. This limitation is addressed by this article, which demonstrates the use of object representations in SSD. The objects are parcels of land that are attributed to grassland farms. The model simulates structural change in agriculture, i.e., change in the size of farms. The aim of the model is to reveal relations between structural change, farmland fragmentation and variable farmland quality. Results show that fragmented farms tend to become consolidated by structural change, whereas consolidated initial conditions result in a significant increase of fragmentation. Consolidation is reinforced by a dynamic land market and high transportation costs. The example demonstrates the capabilities of the object-based approach for integrating object geometries (parcel shapes) and relations between objects (distances between parcels) dynamically in SSD.

中文翻译：

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空间系统动力学中的对象视图：草地农业实例

摘要 空间系统动力学 (SSD) 模型通常通过将存量变量链接到栅格网格来实现，而对建筑物或所有权等人类人工制品的对象表示的使用受到限制。这篇文章解决了这个限制，它演示了 SSD 中对象表示的使用。这些对象是属于草原农场的地块。该模型模拟农业的结构变化，即农场规模的变化。该模型的目的是揭示结构变化、耕地破碎化和可变耕地质量之间的关系。结果表明，分散的农场往往会因结构变化而变得合并，而合并的初始条件会导致分散程度显着增加。动态的土地市场和高昂的运输成本加强了整合。该示例演示了基于对象的方法在 SSD 中动态集成对象几何形状（地块形状）和对象之间的关系（地块之间的距离）的功能。