基于面片集合的三维地籍产权体的拓扑自动构建

在三维地籍应用需求下,分析当前三维表达和自动构造三维几何体的难点和不足;发展基于面片结构的三维拓扑数据模型,指出三维构体时对面片的基本空间约束;提出基于共享边的离散面片集合来自动构建最小三维封闭体及其拓扑关系的方法,并将该方法用于三维地籍的产权体构建和拓扑建立上,在群集产权体构建上体现较强适宜性,为实现三维产权体的管理提供技术方法。     

利用拓扑和度量相结合的方法描述面目标间的空间关系

首先分析了9元组模型描述目标间空间关系的不足，提出了基于点集拓扑和度量特性相结合的方法来分析和描述GIS中面目标间的拓扑空间关系，并给出了合理的几何度量参数及计算方法，增强了空间关系的可区分性，进而提高了空间分析的准确性。该方法将空间关系描述过程概括为3步：①目标发现与定位；②空间拓扑关系的分类（粗略分类）；③在空间拓扑关系粗略分类的基础上，引进几何度量参数，实现空间关系的精化。     

Thirty years on: Planetary climate planning and the Intergovernmental Negotiating Committee

On the occasion of the thirtieth anniversary of the United Nations Framework Convention on Climate Change, this principal supra-national institution remains paramount to the project of planetary climate planning and governance. Reflections on this anniversary should serve to recall the contestations through which this foundational institution was formed, and the delegate dynamics that continue to be reproduced in its wake. The contentious debates and political dynamics that afflicted the Intergovernmental Negotiating Committee tasked with crafting the Framework Convention on Climate Change, as well as dissension in the periphery, remain as relevant today as they were three decades ago. Reprising these dynamics through detailed historical and archival analysis, this article excavates the negotiations of the 1992 Framework Convention on Climate Change by the Intergovernmental Negotiating Committee, which met in 5 sessions during 1991–1992. The aim is to identify key fault-lines and conflicts in the lead-up to the finalization of the 1992 Convention, in order to demonstrate whose epistemic and normative commitments came to be reflected in the final outcome and to show how the legacy of this process endures to date. I seek to render visible actors and proposals peripheralized in the formation of planetary climate governance to extrapolate normative boundaries and proffer heterodox lessons from the margins.