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Ref # 1554 Pin 9353 Online Submission
Meeting Section: IN43A

[edit] The Federated Data System DataFed: Experiences in Data Homogenization and Networking

Rudolf Husar, Kari Hoijarvi, Stefan Falke, Erin Robinson, Gregory Leptoukh

[edit] Abstract

DataFed is a federated information system for accessing, processing and visualization of heterogeneous, distributed Earth Science data. The distributed data sources are federated by applying a universal, multi-dimensional data model based on physical coordinates, latitude, longitude (bounding box), and time range. The physical and semantic homogenization is accomplished by non-intrusive wrapper services. The inputs to the wrappers are instance-specific datasets that are web-accessible, but without formal, structured data access procedures. The output of the wrappers are formal, standards-based data access interfaces. In other words, data wrappers turn loosely structured data into web services. In DataFed, the OGC web services have been adapted as a standard protocol for Air Quality data access. The experiences in the preparation of data wrapper components will be presented. In DataFed, data processing and visualization services are performed through SOAP-based web services, which themselves can be distributed. Data processing, visualization and browsing applications are created by the composition of the distributed service components.

Interoperability experiments have been used to establish compatability of the service components. The results of our group's participation in the GALEON (Geo-interface to Atmosphere, Land, Earth, Ocean netCDF) Interoperability Experiment will be presented. This includes the experience with WCS test servers to deliver a wide variety of point, grid and image coverage data. An evaluation of the WCS protocol for accessing coverages of different data types arising from a variety of Earth observation and modeling systems will be given. The GEOSS Services Network (GSN) is a persistent network of a publicly accessible OpenGIS-accessible services. The IEEE, ISPRS, OGC and other participating organization and members of GEO have also sponsored a series of workshops entitled “The User and the GEOSS Architecture”, each workshop having a region-specific theme, e.g.: Biodiversity in Barcelona, Spain, Tsunami in Seoul, Korea, Wind Energy in Beijing, China, and Air Quality in Denver, Colorado. The experiences and the emerging best practices from these experiments will be presented, including the insights generated through two-way networking with NASA's Giovanni data system. The result of interoperability experiments are encouraging but we recognize that considerable work is to be done on extending the WCS protocol, including the accommodation of new coverage classes and additional returned data types.

[edit] Meeting Details

MEETING CONFIRMATION:

Abstract Reference Number: 1554 Abstract Title: The Federated Data System DataFed: Experiences in Data Homogenization and Networking. Paper Number: IN43A-07 Presentation Type: Oral presentation

Presentation Date: 05/29/08 Location: Fort Lauderdale Convention Center: Room 223 Starting Time: 15:15

Time allotted: 15 minutes