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MECOSIG Adapted to the Design of Distributed GIS

MECOSIG Adapted to the Design of Distributed GIS. F. Pasquasy, F. Laplanche, J-C. Sainte & J-P. Donnay Unit of Geomatics, University of Liège, Belgium http://www.geo.ulg.ac.be. MECOSIG. A method devoted to GIS design and implementation [ published in 1996 ] considering:

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MECOSIG Adapted to the Design of Distributed GIS

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  1. MECOSIG Adapted to the Design of Distributed GIS F. Pasquasy, F. Laplanche, J-C. Sainte & J-P. Donnay Unit of Geomatics, University of Liège, Belgium http://www.geo.ulg.ac.be SEBGIS 2005, Agia Napa, Cyprus, October 31 - November 4, 2005

  2. MECOSIG • A method devoted to GIS design and implementation [published in 1996] considering: • GIS as an Information System (IS) where IS  Organization (systemic approach) • Organization as the core of the method • The method has been progressively improved (last decade) • Emergence of distributed GIS involved : • reassessment of the methodology • new concerns and tools (fitting the requirements of distributed environments) identified SEBGIS 2005, Agia Napa, Cyprus, October 31 - November 4, 2005

  3. MECOSIG - Design protocol • Method covering the complete GIS’s lifecycle • using specific tools at different abstraction levels • Descriptive to Logical-Physical level... • Design protocol is summarized into a monitoring matrix • every cell relates to • specific tools (formalisms, models, prototyping …) • semantic concerns (metadata, documentation …) • Main concerns are • Organization, Data, Data flows, Processes • MECOSIG suggested to go twice through the monitoring matrix • analysis stage (not anymore taken into account because of redundancy with the descriptive level in conception step) • conception step SEBGIS 2005, Agia Napa, Cyprus, October 31 - November 4, 2005

  4. MECOSIG - Monitoring Matrix SEBGIS 2005, Agia Napa, Cyprus, October 31 - November 4, 2005

  5. Adaptations - Descriptive level • Group of actors of the organization(s) must be identified • Actors have their own: • set of privileges • specific use cases • More often a specialization relationship exists between them SEBGIS 2005, Agia Napa, Cyprus, October 31 - November 4, 2005

  6. Adaptations - Descriptive level • Concerning processes (in particular crossed processes in distributed GIS), interactions between groups of actors and the System are identified in terms of: • textual descriptions • UML use cases • Data are identified according to use cases • Data are described in a catalogue and quality must be analysed • Use of standards (ISO 19110 & 19115) is recommended • Further agreements must be achieved in order to incorporate semantic rules in spatial data domain (interoperability requirements …) SEBGIS 2005, Agia Napa, Cyprus, October 31 - November 4, 2005

  7. MECOSIG - Monitoring Matrix SEBGIS 2005, Agia Napa, Cyprus, October 31 - November 4, 2005

  8. Adaptations - Conceptual level • UML class diagram used to design Data (original formalism proposed in MECOSIG - CONGOO is substituted) • is internationally admitted as standard (System modelling) • offers more than only one diagram • design can combine serial of models to depict a context • Specificity of spatial data in UML • object’s geometry • a lot of studies [e.g. COMOSIG Workshops ER2004, Bédard & al., 2004] dealt with • stereotypes or tagged values allow to adapt UML • topological relationships • concept of topological matrix (originally from CONGOO) is added and adapted • two kinds of topological matrix are available • the traditional matrix and the strong one SEBGIS 2005, Agia Napa, Cyprus, October 31 - November 4, 2005

  9. Adaptations - Conceptual level SEBGIS 2005, Agia Napa, Cyprus, October 31 - November 4, 2005

  10. Adaptations - Conceptual level • Every use case is extracted from the descriptive level and detailed using UML activity diagrams • Sequence diagrams are used to conceptualize specific scenarios of activity diagrams SEBGIS 2005, Agia Napa, Cyprus, October 31 - November 4, 2005

  11. MECOSIG - Monitoring Matrix SEBGIS 2005, Agia Napa, Cyprus, October 31 - November 4, 2005

  12. Adaptations - Organizational level • Facing the implementation of a distributed infrastructure, important organisational constraints must be met • missions of all actors should be assessed and possibly redefined • new tasks are introduced in order to guarantee • maintenance, permanent working and growth of the distributed System • new data flows are generated and others have to be adapted • data exchange must be performed easily and in a transparent way for all users • access to metadata [ISO standards] - particularly metadata related to quality (data usability and appraisal of final results) • some data / services access can be restricted or subject to authorization(s) SEBGIS 2005, Agia Napa, Cyprus, October 31 - November 4, 2005

  13. Adaptations - Organizational level • From these purposes • coming up representative’s committees in charge of coordination tasks • formalization can also be introduced to depict their tasks (UML use cases, activity & sequence diagrams, …) SEBGIS 2005, Agia Napa, Cyprus, October 31 - November 4, 2005

  14. MECOSIG - Monitoring Matrix SEBGIS 2005, Agia Napa, Cyprus, October 31 - November 4, 2005

  15. Adaptations - Logical-Physical level • Roles and tasks of all actors should be clearly specified • key is to associate all actors in the new System which will be set up • e.g.: • sensitizing and training sessions to facilitate the understanding of the re-engineered system • possible reallocation of human resources • Constitution of the representative’s committees in charge of coordination tasks • competent and representative of the various departments or organizations • receiving the ability to act decisively • Managerial economies and economies of scale could be achieved • Acquisition of common reference data • Globalisation of software licenses SEBGIS 2005, Agia Napa, Cyprus, October 31 - November 4, 2005

  16. Adaptations - Logical-Physical level • A technical study must be completed • to guarantee the required degree of interoperability • to identify precisely • add-on hardware and software • distributed system components • systems for cross-relating items of information across multiple sources • Modelling process is to design objects which must be deployed in a distributed System • e.g. data storage structure (components and deployment UML diagrams) • previous activity and sequence diagrams (conceptual level) are improved • by adding objects dealing with data flows, procedures and processes according to GIS software, tools and DBMS specificities... SEBGIS 2005, Agia Napa, Cyprus, October 31 - November 4, 2005

  17. Adaptations - Logical-Physical level SEBGIS 2005, Agia Napa, Cyprus, October 31 - November 4, 2005

  18. Adaptations - Logical-Physical level • Whole of the logical-physical level is integrated into a evolutionary project pilot SEBGIS 2005, Agia Napa, Cyprus, October 31 - November 4, 2005

  19. Thank you…Q / A ? http://www.geo.ulg.ac.be SEBGIS 2005, Agia Napa, Cyprus, October 31 - November 4, 2005

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