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. ...
The official databases that collect spatial data sets, should contain the sets of metadata used to describe them. The main element of the set of metadata are the features describing of the quality and validity of spatial data. The paper proposes a method for evaluating the quality of databases of spatial registration of utility infrastructure (GESUT) based on four criteria: positional accuracy, completeness, timeliness and logical consistency. The quality of property data of positional accuracy is calculated based on the attribute of source (specified for each type of test object of GESUT). Completeness of data was calculated on the basis of GESUT objects that exist on the digital basic map, and did not registered them in a GESUT. Timeliness of data was determined by analysis of time to waiting for the inserting to database geodetic measurements. Logical consistency was assessed by analyzing of level conflicting relationships in the data. The evaluation results for the various properties are described by the value of a point on a scale from 1 to 100. Overall evaluation of the quality of the data bases GESUT was performed by calculating the two estimators: the value of average absolute and factor of medium volatility. ...
