2. DataFed in a Nutshell DataFed Vision Aid air quality analysis by effective use of relevant data DataFed Goals Facilitate access and flow of AQ data from provider to users Support user-driven data processing value chains Participate in specific application projects Approach: Mediation Between Users and Data Providers DataFed assumes spontaneous, autonomous data providers Non-intrusively wraps datasets for access by web services Mediates, homogenizes data views. e.g. geo-spatial, time... Applications Browsers and analysis tools for distributed monitoring data Serve as data gateway for user programs; GIS, science tools DataFed is focused on the mediation of air quality data
3. Typical DataFed AQ Analysis Tools Consoles : Data from diverse sources are displayed to create a rich context for exploration and analysis CATT : Combined Aerosol Trajectory Tool for the browsing backtrajectories for specified chemical conditions Viewer: General purpose spatio-temporal data browser and view editor applicable for all DataFed datasets
4. Web Services: Building Blocks of DataFed Programming Access, Process, Render Data by Service Chaining [Station] [Monitor] Clickable monitor locations layer Map boundary layer
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9. Data Access through Adapters through DataFed SOAP,HTTP Get OGC WCS HTTP Get, Post OGC WMS HTTP Get Station-Point SQL Server, Files… Sequence Image, file nDim Grid OpenDAP NetCDF, … Other Traject., Event, Pic Sources Diverse formats Many data models Data Wrapper Data into geo-cubes Queries to views Virtual Data Cube Global geo-cube data model Makes queries data-neutral Others? e.g. OpenDAP Output Protocol dependent User specified GeoTable CSV,XLS,GML GeoGrid GML,NetCDF.. GeoImage GeoTIFF, PNG.. Other MS Dataset.. Query Adapter Maps query to protocol User selects protocols
11. Data Access Services 1. Click Services Button 4. Set Output Format 3. Access Settings 2. Select Data Access Protocol 4. Execute WCS Query in Browser or in Program 5. Consume data by program, service or viewer
16. Benefits of WMS Compatibility: Geospatial One-Stop Provides Access to DataFed spatial layers through WMS Problem: No Time Dim! http:// www.datafed.net/DataLinks/OGC/OGC.htm DataFed/VIEWS Asian Dust Concentration (circles) S. Falke
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18. Table 17 — Parts of SpatialDomain data structure Zero or more Include one for each point needed gml:Point Unordered list of points whose union covers spatial domain of this coverage offering c Point Zero or more (optional) Include one for each polygon needed gml:Polygon Unordered list of polygons whose union covers spatial domain of this coverage offering c Polygon Zero or more (optional) Include one for each different grid used (TBR) gml:Grid OR gml:RectifiedGrid Unordered (TBR) list of grids that describe internal grid structure of this coverage offering b Grid One or more (mandatory) ows:BoundingBox Unordered list of bounding boxes whose union covers spatial domain of this coverage offering a BoundingBox Multiplicity and use Data type Definition Name
![Air Quality Cluster Technology Track Earth Science Information Partners Data Flow & Interoperability in DataFed Service-based AQ Analysis System R. B. Husar, S. R. Falke and K. Höijärvi Washington University, St. Louis, MO ESIP Federation Winter Meeting 2006 Washington, DC, January 4, 2006 Partners ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]](https://image.slidesharecdn.com/060128-galeon-rept769/85/060128-Galeon-Rept-1-320.jpg)
