Data quality descriptions play a key role in Geographic Information Systems (GIS). With the availability of geographic data sources over the internet, there is a real issue to be addressed, that is how to ensure quality of web-based heterogeneous GIS. The issue is threefold: first, we have to perform data integration, second we have to manage the quality information if any, and third, we have to provide a mechanism that mixes two technologies, which, to the best of our knowledge has not yet been fully addressed.