Expanded Data Quality Model for Increased Reliability in Mashed-Up Environments
Luethy, Juerg
Along with the growing availability of Spatial Data Infrastructures the publication of spatial data through the Open Government Data initiatives has been significantly increased. Thanks to standardised services (Web Map Services, Web Feature Services) and a range of supporting software tools and libraries the consumption of spatial data is uncomplicated. To ensure correctness of data and correct use of the data at the end user the quality model for the SDI of the Canton of Zurich (Switzerland) must be completely revised and expanded. The quality model covers the roles of data producers, data providers and data users as well as the transport processes in between them (complete data chain). For the producer side it is based on existing concepts (ISO 19157) but is expanded for better addressing the third and fourth dimension. To ensure the data integrity from data origination to the end user the aspect of traceability must be moved from a descriptive metadata item to a core quality element. The real-time use, the spread and the retransmission of data sets requires the introduction of the criterion quality of service which must be addressed by service providers and service brokers. Governmental and moreover cadastral data must put highest priority for correct, reliable and trustable data and the contingency of data services also under adverse conditions. The quality model presented in this paper serves as guideline for the further development of the SDI of the canton of Zurich.
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