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THETIS: A Data Management and Data Visualization System for Supporting Coastal Zone Management of the Mediterranean Sea

This research paper discusses the design and implementation of THETIS, a system that provides online access, efficient search capabilities, flexible data integration, dynamic invocation of models, and interactive data visualization for coastal zone management in the Mediterranean Sea.

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THETIS: A Data Management and Data Visualization System for Supporting Coastal Zone Management of the Mediterranean Sea

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  1. THETIS:A DATA MANAGEMENT AND DATA VISUALIZATION SYSTEM FOR SUPPORTING COASTAL ZONE MANAGEMENT OF THE MEDITERRANEAN SEA (F0069: Telematics on Research) Hariklia Tsalapata (ICS-FORTH)

  2. A Data Management and Data Visualization System for supporting Coastal Zone Management of the Mediterranean Sea CONSORTIUM • ERCIM • ICS-FORTH • IACM-FORTH • INRIA • HR-WALLINGFORD • IMBC • ALCATEL • CNR • RECORMED

  3. Information Management & CZM • Importance of Information Management in CZM • MAP, OECD, Info-Coast, MUSEC • Heterogeneity • w.r.t. content, storage format, classification • Scale and Data Availability • within a single organisation or group of collaborating institutions, data are kept in separate locations, but it is desirable to have a single point of access • Remote Execution • information can often be computed using simulation models that run on (specialised) hardware installed at remote locations • Open-ended Information Processing • data may go through several processing steps to create information products that are of interest to different user groups (scientists, authorities, citizens)

  4. Objectives • Vision: • Information management in CZM is promoted through an open, federatedsystem that facilitates resource sharing while maintaining operational autonomy for its members • Objective: design & implement a system that provides • On-lineaccess using WWW technology • Straightforward plug-in / publishing capability both for models and data sets • Efficientsearch for data and models via appropriate metadata descriptions and a distributed search engine • Flexibledataintegration using mediation techniques • Dynamicinvocationof models to produce data on demand • Interactivedatavisualisation using GIS technology

  5. Design: Locating Data and Models • Metadata set • The THETIS metadata relies on the FGDC standard • Extensions and refinements • are considered during development, as data and models are added to the system • Legacy sources • are incorporated using metadata descriptions for their data/models • Data and models can be published • Publication of new data and models can occur anytime; system indices are updated incrementally and with no human intervention • Metadata search requests • can be submitted to any server of the system from any location connected to the Internet

  6. Design: Data Integration & Processing • Wrappers • Data and models are plugged into the system using special software adapters called wrappers that export a relational view of data, independently of the actual underlying storage technology (e.g. files, DB). Model wrappers export an interface through which simulation programs can be invoked remotely • Data views • are built interactively by combining data sources • Computed data • are generated on demand by combining data sources and models • Both views and computed data can be published in the system just like ordinary data in order to be made available to others

  7. WWW Interface results SQL-like query metadata search content Server Node Search Engine Retrieval Engine wrapper publish access data sets model Provider Architecture (Overview)

  8. Interface (tentative) get metadata description request data visualization get model interface find objects of interest compute & store new data

  9. Demonstration Scenaria • Waste Transport: • for the simulation of pollution point sources • Computation of general circulation data • Computation of the concentration of effluents based on general circulation data • Visualisation of the transport of pollutants • Tracking of Sea Structures: • for the study of the dynamic of oceans • Extraction of oceanographic structures from satellite images through stepwise image processing • Nearshore and Offshore Waves: • for coastal defences, coastal and offshore structures, flood prevention, etc. • Calculation of the wave climate based on historical wind and wave data • Estimation of directional (2D) spectra of surface waves based on heave-pitch-roll time series

  10. Conclusions • Architecture for the location, integration, and visualisation of scientific information • THETIS is tailored for CZM • The architecture can be applied to other environmental information management systems • The system is currently under development

  11. Dataflow Descriptions (example) - Wind Direction - Wind Velocity - Pollution Source - Time Step Data Sets Models User Input Condition 2-D Circulation Model WADIS Model Bathymetry (incl. Coastline) Velocity Field & Elevation Concentration of Pollutant in Time

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