In GIS, a measure or identification of how fit for use cartographic data is. Data quality applies to various levels, from an individual point to the entire data set or coverage.

The degree of excellence exhibited by the data in relation to a correct portrayal of the actual phenomena.

The degree of excellence of data. Factors contributing to data quality include: the data is stored according to their data types, the data is consistent, the data is not redundant, the data follows business rules, the data corresponds to established domains, the data is timely, the data is well understood, the data satisfy the needs of the business, the user is satisfied with the validity of the data and the information derived from that data, the data is complete, and there are no duplicate records. For example, this means that a customer's name is spelled correctly and the address is correct.

data quality assurance

The narrow definition of data quality is that it's about data that is missing or incorrect. A broader definition is that data quality is achieved when a business uses data that is comprehensive, consistent, relevant and timely.

This is the degree to which the collected data (results of measurement or observation) meet the standards of quality to be considered valid (trustworthy) and reliable (dependable). This term has been used by Punch (1998) to represent "quality control of data (p. 257)" "in terms of procedures in the collection of the data, and … in terms of three technical aspects of quality of the data: reliability, validity, and reactivity, p.257)" (1) Data/Measurement validity: Do the results of data collection truly represent the construct or phenomenon that they are expected to capture (measure or represent)? "How well the data represent the phenomena for which they stand (Punch, 1998, p.258)." See also convergent validity and discriminant validity. (2) Data/Measurement reliability: Do the obtained results of measurement or observation accurately reflect the magnitude, intensity, or quality of the attribute or phenomenon that is being measured or observed? Back to the top

See Main Definition: search engine data quality

refers to the degree of excellence exhibited by the data in relation to its portrayal of the actual phenomena.

Data Quality refers to the quality of data. Data are of high quality "if they are fit for their intended uses in operations, decision making and planning" (J.M. Juran).