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International Journal of Spatial, Temporal and Multimedia Information Systems
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International Journal of Spatial, Temporal and Multimedia Information Systems (3 papers in press)
The Stick operator : The management of several points of view in a Geographical Information System by Géraldine Del Mondo, Michel Mainguenaud Abstract: In this article, we propose the Stick operator which provides a unique point of view from two points of view in the context of a Geographical Information System. It is based on two alphanumeric data models we merge in order to obtain a single data model (i.e., the result of the Stick operator). This operator uses a set of rules defined on characteristics of data models associated with each point of view. These characteristics are based on the links between the spatial dimension and alphanumeric data. It can be used when two different levels of details/abstraction or two sources have to be merged.rnWe rely on a labeled graph to formalize data models and work till the attribute level. The Stick operator takes advantage of characteristics such as the intersection of graphs, the existence of quasi-strongly connected graphs or paths to provide an extended result data model. Keywords: semantic alphanumeric data; levels of abstraction; geographical information systems; data model merge; graph data model; database view; database snapshot;.
Representing Spatial Objects in Data Warehouses: A Logical Solution by Georgia Garani Abstract: Spatial data warehouse logical design involves mainly extending the techniques used in relational logical data warehouse design for the support of spatial objects, i.e. geometric objects in space. Spatial objects can have different geometric granularities and can be found at different hierarchical levels of a dimension in the logical model of a data warehouse. This paper addresses data warehouse logical design considerations for a consolidated representation of spatial and non-spatial data. The novelty of the model presented in this paper is the representation of spatial objects in a logical and semantically effective manner. With this approach, complex spatial objects can be modelled in a generic and user-friendly format. The model also includes ROLAP operations supporting the navigation across different dimensions levels and the execution of queries. The functionality of the model is also provided by a number of example queries. Keywords: Spatial Data Warehouse; Spatial Object; Starnest Schema; Logical Modelling; ROLAP; Spatial Data Management; Spatial Nested Dimension; Spatial Attribute; Dimension Level Path; Spatial Query Language.
An Approach to GIS-based Traffic Information System using Spatial Oracle by Subhas Barman, Atanu Sarkar, Rajat Kamal Roy, Sourav Saha, Kajal Rajak, Joydeep Sarkar Abstract: Traffic congestion is a threat to the economical, environmental, social and sustainable development of a city. The traffic management has always been an issue of concern for urban areas of a city. Geographic Information System (GIS) offers an effective solution to the traffic management of a city and helps urban planners to reduce traffic congestion in cities to a large extent. In addition, it helps the peoples to find out necessary information regarding traffic, road, location and direction of a destination. Generally, GIS is being used efficiently and effectively to implement a traffic management system. General traffic system is limited in data sharing and it is difficult to achieve integration in data processing. In this work, an urban traffic management system based on geographic information system (GIS) is implemented to handle the roads, landmarks, sensitive areas and traffic information for urban traffic police locus. The application of the system based on GIS has very important significance for improving the work efficiency and information sharing in basic traffic management. Our work solves various traffic related problems and retrieve the traffic centers that have to be alert in different situations. Our work also can find all the possible connected paths from a particular source to destination with respective distances. The detected shortest path is visualized with the connected paths in our approach. Keywords: Geographic information system; traffic management; connected paths; roads; shortest path; landmarks;.