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Dynamic and Mobile GIS: Investigating Changes in Space and Time - Chapter 4

GIS động và điện thoại di động 'các cuốn sách về phương pháp tiếp cận mô hình hóa, đặc biệt là thích hợp để miêu tả Những quá trình năng động trong GIS. Những đóng góp lò hiện một mức độ cao của tính mới và Gợi ý một sự tiến hóa khấu của mô hình dữ liệu, phân tích không gian và các truy vấn không gian. Khi Trái ngược với các phương pháp tiếp cận GIS ban đầu xem xét đặc điểm địa lý và mối quan hệ . | Part II Modelling Approaches and Data Models Part II of the book Dynamic and Mobile GIS focuses on modelling approaches especially those appropriate to depicting dynamic processes in GIS. The four contributions present a high level of novelty and suggest a dramatic evolution of data models spatial analyses and spatial queries. As opposed to initial GIS approaches considering geographic features and relations among them as independent of time Kate Beard in Chapter 4 proposes an event-based approach in which change itself is the central concept that is modelled. Events as explicit representations of change with associated attributes of change such as rate of change or rate consistency provide the key units for exploration and analysis of the mechanism of change. In this approach the time dimension dominates the spatial dimensions as the ordering of events in time is critical. An event-based view provides the foundation for the analysis of dynamic phenomena and is therefore naturally appropriate for dynamic GIS. Chapter 4 includes a very complete state-of-the-art presentation of dynamic process modelling and eventbased models. A formal categorization of changes is then proposed sources of events are described and a method for event visualisation and exploration is outlined. Femke Reitsma and Jochen Albrecht present in Chapter 5 a new process-based data model called nen after node-edge-node graph representation . While most of the existing theories and models for simulating processes focus on representing the state of the represented system at a moment of time this approach expresses and represents information about processes themselves. This data model provides advantages in querying analysis and exploration of process descriptions under computer simulation conditions - or in silico. Chapter 5 includes a description of the model and presents its application in a small watershed modelling test case. Part of the originality of nen is to provide a new epistemological .