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THE HARMONISATION CHALLENGE OF CORE NATIONAL TOPOGRAPHIC DATABASES IN THE EU-PROJECT GIMODIG

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The project GiMoDig (Geospatial Info-Mobility Service by Real-Time Data Integration and Generalisation) started in November 2001 and is funded by the European Union. With a duration of 3 years this EU-project has the goal to develop methods for harmonisation, generalisation and visualisation of national topographic data sets for mobile users in real time. The project partners are the Finnish Geodetic Institute as a project coordinator, the National Mapping Agencies (NMAs) of Denmark, Finland, Sweden and Germany and the University of Hanover, the Institute of Cartography and Geoinformatics. One of the tasks in the GiMoDig project is to define a Global Schema for the core national topographic data sets. For this purpose an inventory on the national databases is prepared to list the differences in data availability and data modelling. Based on that inventory, a selection of feature types suitable for Location Based Services (LBS) is made. The idea is to use the least common denominator as selection criteria but this subset already lacks some important feature types. Finally all features that are supported by a majority of national data sets are integrated in the Global Schema. The Global Schema is defined with a detailed description about feature type, attributes, collection criteria and geometry type. All necessary information about harmonisation operations are given to be able to transform the topographic data from the national schema into the Global Schema. Further scrutinizations of test data lead to an improvement and adaptation of the Global Schema.
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... Analysis of the questionnaire and results from the GiMoDig (Afflerbach, Illert and Sarjakoski, 2004) project support the possibility that a common data model for topographic data is feasible at some level. The results of the questionnaire indicated that many countries have similar feature types, but we could not actually compare the semantics or how the feature types actually represent the real world. ...
... Technically, traditional data warehouse concepts, distributed databases, mediator services and ontology might be applied. These concepts have been studied by Bishr (1997Bishr ( ,1998, Devogele et al. (1998), Sarjakoski et al. (2002), Afflerbach et al. (2004) and Jakobsson (2003b). ...
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Topographic information management is essential for the future of National Mapping Agencies (NMAs). Information economy, globalisation, government reorganization and users expectations will change many mapping agencies during the coming years. The implementation of Spatial Data Infrastructures (SDIs) and the meeting of business objectives are major challenges and could have contradictory goals. This research investigated how topographic base information management at the national and European levels might be based on multiple data sources and how information and quality management principles could be utilized for this. Four topics are covered: management of topographic information in Finland, user requirements and the data quality of basic topographic data, Geographic Information Quality Management (GIQM) of topographic base data and European cooperation between NMAs. The first part of the dissertation introduces the history of topographic mapping in Europe and especially in Finland. The development of SDIs is explored and information
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Thesis
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Modelling and integration of geospatial data play an important role in the geospatial domain. By using UML for defining the models, a model-driven transformation approach for data integration can be applied. However, the transformation is hindered, when the models adhere to different and deficient UML profiles. The thesis presents solutions for coping with these UML profiles. This includes a generic concept for developing UML profiles in a structured and reusable way, a Core UML profile as a universally applicable building block and a multi-level information integration framework which transforms between UML models based on these UML profiles.
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... Two of the main principles of INSPIRE are: "It should be possible to combine seamless spatial information from different sources across Europe and share it with many users and applications; […it should be] easy to find what geographic information is available, how it can be used to meet a particular need, and under which conditions it can be acquired and used." (INSPIRE, 2007) As in some other works related to cartography harmonisation (Tóth 2007, Afflerbach 2004) and also in the ALIRHYS project, our purpose was to respect these two principles by producing some cartographic data and sharing them on a WebGIS together with every useful metadata file. The European project ALCOTRA -ALIRHYS (2013-2015) has been developed by the partnership among the Politecnico di Torino, Politech Nice Sophia, Université Nice Sophia -Antipolis, Regione Piemonte and the Nice -Côte d'Azur Metropole, with the aim of studying and monitoring the subterranean hydric resources in the crossborder mountainous territory between the provinces of Cuneo and Nice (Fig.1). ...
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... In the GiMoDig project there are four different national data models involved. Each of the participating countries has organized the topographic map data in an individual way. For the purposes of the data integration a common data model, named GiMoDig Global Schema has been developed (GiMoDig, 2003b), (Afflerbach et. Al, 2004). This data model consists of 17 different Feature types. These types are selected based on the data availability in the national databases on one hand, and on the requirements of the selected mobile use cases on the other. The list of the Global Schema Feature types is shown in Table 1. The GiMoDig prototype service is built according t ...
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... XSLT extension functions are found to be a valuable tool for introducing geodata-specific operations, such as coordinate system transformation, into the process. On the Data Integration service layer of the GiMoDig prototype, schema transformations are carried out to integrate the topographic map datasets of four countries (Germany, Denmark , Sweden and Finland) into a seamless service providing datasets in a jointly agreed common schema (GiMoDig Global Schema) (Afflerbach et al. 2004). The integration service carries out two-way transformations, handling both query and data transformations using the same base technology, XSLT. ...
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The aim of this paper is to describe the background and the objectives of an European Commission funded project GiMoDig (Geospatial info-mobility service by real-time data-integration and generalisation), which was recently started. The background of the project lies in the goal to improve the accessibility of the national primary topographic databases, especially for mobile users. A prototype system providing geo-spatial service will be implemented and used as a test-bed in the frame of the project. The common access interface is based on the emerging standards like XML and Open GIS Consortium's specifications. Besides methods for transferring vector-formatted data based on standards like GML and SVG, the work comprises several important issues like development of methods for real-time generalisation and data integration, definition of global schema, thematic harmonisation of geodata, development of methods for data transformation to a EUREF co-ordinate system, a study on small-display cartography and identification of the most important use cases for topographic data in mobile environment.
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