Az internetes tartalom és kapcsolódó szabályozás elméleti és gyakorlati vetületei

Megjegyzés az értekezés megjelenítéséről: az értekezés könyv formában való kiadása miatt nem érhető el a disszertáció; a tézisek szabadon olvashatóak. A könyv megjelenési adatai: Paragrafusokkal a bitek ellen: Az internet szabályozásának elmélete és gyakorlata. Budapest: HVG-ORAC, 2016. ISBN: 978-963-258-303-

DATA QUALITY IN GIS SYSTEMS

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

Lessons learnt from the adoption of open source GIS for quality control of the Hungarian LPIS

Abstract Compet-Terra is carrying out QA (Quality Assurance) services for the Hungarian Agriculture and Regional Development Agency. Quality control of the LPIS is one of the important QA duties. The LPIS data set is updated yearly according to the cycles of agricultural subsidies. Compet-Terra elaborated an Open Source Software based checking method that could be adopted by the client without the financial expense of software. QuantumGIS (as the primary tool), gvSIG, and LibreOffice were used for the quality control of the LPIS. Four primary quality types were checked: (1) the land parcel attributes, (2) the areas of the polygons, (3) the completeness of the content and (4) the topological quality. For these investigations topological GIS functions and database management functions were used. The most important functions were topological difference calculation, polygon area calculation and geometry validity check. Complex procedures were also carried out with proprietary tools to compare the results and the run-time performances. The result of the adoption of OSS GIS tools for LPIS checking was positive. All the planned procedures could be implemented using OSS GIS. OSS tools proved to be robust, reliable, userfriendly and performed well