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Processes and events in the centre:a dynamic data model for representing spatial change

International Journal of Digital Earth 2022年第1期15卷 276-295页

作者： Yufeng He Yehua Sheng Barbara Hofer Yi Huang Jiarui Qin School of Geography Nanjing Normal UniversityNanjingPeople’s Republic of China Key Laboratory of Virtual geographic Environment (Nanjing Normal University) Ministry of EducationNanjingPeople’s Republic of China Jiangsu Center for Collaborative Innovation in geographical Information Resource Development and Application NanjingPeople’s Republic of China Department of Geoinformatics-Z_GIS University of SalzburgSalzburgAustria School of geographic and Biologic Information Nanjing University of Posts and TelecommunicationsNanjingPeople’s Republic of China

Traditional geographic information system models for map representation use superposition of layers to model physical reality,neglecting the integrity of the environment and limiting the ability to express interactions between features in complex phenomenon.This results in limitations regarding dynamic simulation and geographic causality reasoning.In this paper,we extend the framework of the geographic scene by formalizing the relationship between geographic processes and events to construct a dynamic data model:the process-event-centred dynamic data model.The key element of this data model is relationships between processes,events,and states of the natural or man-made phenomenon of interest.The identified relationships can be translated into a network of hierarchical,developmental,and causal graphs and realized in the Neo4j graph database.The implementation in the graph database supports spatio-temporal reasoning in geographic scenes and achieves an organizational framework for simulating spatio-temporal dynamics and complex calculations.The example of a 2019 mega-typhoon process is used to demonstrate the introduced process-event-centred model and its implementation in the graph database.A series of queries to the graph database show the capabilities of the data model for spatial reasoning and dynamic modeling.

关键词： Spatio-temporal dynamics geographic scene geographic processes geographic events spatio-temporal reasoning graph database

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geographic scenario:a possible foundation for further development of virtual geographic environments

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International Journal of Digital Earth 2018年第4期11卷 356-368页

作者： Guonian Lü Min Chen Linwang Yuan Liangchen Zhou Yongning Wen Mingguan Wu Bin Hu Zhaoyuan Yu Songshan Yue Yehua Sheng Key Laboratory of Virtual geographic Environment Ministry of Education of PRCNanjing Normal UniversityNanjingPeople’s Republic of China State Key Laboratory Cultivation Base of geographical Environment Evolution(Jiangsu Province) NanjingPeople’s Republic of China Jiangsu Center for Collaborative Innovation in geographical Information Resource Development and Application NanjingPeople’s Republic of China

It has been two decades since virtual geographic environments(VGEs)were initially proposed.While relevant theories and technologies are evolving,data organization models have always been the foundation of VGE development,and they require further exploration.Based on the comprehensive consideration of the characteristics of VGEs,geographic scene is proposed to organize geographic information and data.We empirically find that geographic scene provides a suitable organization schema to support geo-visualization,geo-simulation,and geo-collaboration.To systematically investigate the concept and method of geographic scene,geographic Scenario is proposed as the theory on developing geographic scene,and corresponding key issues of the geographic Scenario are illustrated in this article.Prospects of the proposed method are discussed with the hope of informing future studies of VGEs.

关键词： Virtual geographic environments(VGEs) data organization geographic scene geographic scenario

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