Data Catalog Side Meeting

The following points were presented and discussed (see File:AQ SOLTA 2011-Data Catalog side meeting.pdf)

Catalog architectures

   * Centralized catalog
   * Distributed catalog
   * Broker catalog

GI-cat: a broker catalog to federate heterogeneous standard services

   * Catalog services (CSW, OpenSearch, ...)
   * Inventory services (THREDDS, WAF, ...)

• Access services (WCS, WMS, ...)

Demo: GI-go, GI-portal - what are the facets of description for AQ data?

Broker catalog use cases

   * Addition of new heterogeneous server nodes to the existing capability

• Addition of new interfaces to the available services

Added MACC WCS

Discovery standards

   * Metadata standards (ISO 19115/ISO 19139)
   * ISO19139 publishing mechanisms (FileSystem, Web Accessible Folder-WAF, Native XML Database-NXD, CSW/ISO)
   * CSW queryables review (ISO properties for discovery)

Access

   * OGC services (WCS, WMS, WFS, SOS)
   * Metadata conventions (CI_OnlineResource) for OWS data access
   * Brokered-access (EuroGEOSS access broker)

Interoperability

   * The Air Quality Community Catalog (metadata and service interfaces, functionalities and role)
   * Test outcomes of GI-cat federating the Air Quality catalog
   * uFind functionalities and features

uFind: faceted-search; facets extracted from capabilities (key-value-pairs encoded in keywords with <facet>:<value> syntax); there exist an AQ controlled vocabulary (derived from CF conventions)

Issues

   * Metadata for discovery in AQ
   * AQ data granularity level
   * How can the AQ Community Catalog and GI-cat complement each other effectively?