Summary:

Computer databases that store information describing the space should be judged qualitatively. This requirement especially applies to the official geoinformation systems. The paper presents a proposal for an overall assessment of the quality of the information collected in the county's databases. It was analyzed six thematic groups: land and buildings cadastre, base numerical map, spatial registration of utility infrastructure and horizontal control class III. Experimental studies carried out in two counties located in the Malopolska province. Data quality assessment was based on four characteristics: accuracy, completeness, timeliness and consistency. Then calculated values of the two estimators of the overall assessment of geo-information databases: the average absolute value and coefficient of variation of averages. Overall assessment of quality geospatial data in the two counties is good.
The process of improving the quality of informations presented comparing the results of current work to a study conducted in 2005. In this period fixed overall assessment of data quality in both counties by about 5 percentage points. Accuracy, timeliness and consistency of county data systems is good. While the completeness of the data still does not meet the required criteria.