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Istituto sull'inquinamento atmosferico

Torna all'elenco Contributi in atti di convegno anno 2012

Contributo in atti di convegno

Tipo: Poster

Titolo: GI-axe: an access broker framework for the geosciences

Anno di pubblicazione: 2012

Formato: Elettronico

Autori: Enrico Boldrini, Stefano Nativi, Mattia Santoro, Fabrizio Papeschi, Paolo Mazzetti

Affiliazioni autori: ESSI-lab of IIA, CNR, Prato, Italy

Autori CNR:


Lingua: inglese

Abstract: The efficient and effective discovery of heterogeneous geospatial resources (e.g. data and services) is currently addressed by implementing "Discovery Brokering components"""such as GI-cat which is successfully used by the GEO brokering framework. A related (and subsequent) problem is the access of discovered resources. As for the discovery case, there exists a clear challenge: the geospatial Community makes use of heterogeneous access protocols and data models. In fact, different standards (and best practices) are defined and used by the diverse Geoscience domains and Communities of practice. Besides, through a client application, Users want to access diverse data to be jointly used in a common Geospatial Environment (CGE): a geospatial environment characterized by a spatio-temporal CRS (Coordinate Reference System), resolution, and extension. Users want to define a CGE and get the selected data ready to be used in such an environment. Finally, they want to download data according to a common encoding (either binary or textual). Therefore, it is possible to introduce the concept of "Access Brokering component" which addresses all these intermediation needs, in a transparent way for both clients (i.e. Users) and access servers (i.e. Data Providers). This work presents GI-axe: a flexible Access Broker which is capable to intermediate the different access standards and to get data according to a CGE, previously specified by the User. In doing that, GI-axe complements the capabilities of the brokered access servers, in keeping with the brokering principles. Let's consider a sample use case of a User needing to access a global temperature dataset available online on a THREDDS Data Server and a rainfall dataset accessible through a WFS""she/he may have obtained the datasets as a search result from a discovery broker. Distribution information metadata accompanying the temperature dataset further indicate that a given OPeNDAP service has to be accessed to retrieve it. At this point, the User would be in charge of searching for an existing OPeNDAP client and retrieve the desired data with the desired CGE; worse he/she may need to write his/her own OPeNDAP client. While, the User has to utilize a GIS to access the rainfall data and perform all the necessary transformations to obtain the same CGE. The GI-axe access broker takes this interoperability burden off the User, by bearing the charge of accessing the available services and performing the needed adaptations to get both data according to the same CGE. Actually, GI-axe can also expose both the TDS the WFS as (for example) a WMS, allowing the User to utilize a unique and (perhaps) more familiar client. The User can this way concentrate on less technological aspects more inherent to his/her scientific field. GI-axe has been first developed and experimented in the multidisciplinary interoperability framework of the European Community funded EuroGEOSS project. Presently, is utilized in the GEOSS Discovery & Access Brokering framework.

Lingua abstract: inglese

Congresso nome: AGU Fall Meeting 2012

Congresso luogo: San Francisco, United States

Congresso data: 3-7 December 2012

Congresso rilevanza: Internazionale

Strutture CNR:


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