DATA QUALITY IN GIS SYSTEMS

Abstract

The quality of data depends on various factors: e. g. accuracy, precision, consistency and lineage. Beside these factors, the definition of the data reliability will be discussed in detail. In the data quality management it is necessary to estimate the values of the quality components before the realization of the data base (a priori estimation) in the period of data bases design. It is required to have redundance in the data for the a posteriori estimation of the quality components in the control period. In the paper some mathematical-statistical methods for the a priori and a posteriori estimation of data quality are presented. Along with the theoretical foundation some examples and numerical values will be given, too.