GeoViQua is a European FP7 project that significantly contributes to the Global Earth Observation System of Systems GEOSS by adding rigorous data quality representations to existing search and visualization in the GEO Portal functionalities. The open workshop will review and present these developments: (a) The GeoViQua quality framework that enhances producer metadata, and proposes the addition of user feedback. The producer model builds on existing ISO standards (19115 and 19157) adding reference dataset information, citations, traceability of quality statements and discovered issues. The user model informs the database structure for a feedback server from which comments, citations, discovered issues, ratings and reports of usage may be stored and retrieved. (b) A Quality-aware discovery service, namely a quality-aware extension of the OGC Catalog Service for the Web (CSW-Q), which could cope with quality-constrained search. It will be
included in the GEOSS Discovery and Access Broker. (c) A standard-based visualization approach for the visualization of quality / uncertainty information in 2D is developed using OGC Web Map Service (WMS). This extension reuses concepts in UncertML in ncWMS server implementation. (d) A GEO label as a graphical representation of a dataset in the GEOSS (or other data portals and clearinghouses) based on the quality information that is available for it. (e) A user feedback catalogue where users can introduce comments, citations, discovered issues, ratings and reports of usage. This information can then be retrieved by the Discovery and Access Broker. (f) Some enhancements in metadata presentation such as, metadata size by side comparison, rubric metadata completeness assessment, provenance visualization, etc.