This graduation thesis analyses the data quality of three online cartographic platforms that are formed based on Volunteered Geographic Information (VGI): OpenStreetMap, Wikimapia and OpenTopoMap. The analysis focused on assessing the completeness and positional accuracy of the displayed data. Three types of test sites were chosen within Slovenia’s boundaries, representing urban, rural and high mountain areas. For each type three test sites were determined: for urban test sites Koper, Kamnik and Kočevje, for rural Šmarje pri Kopru, Tunjice and Senuše, for high mountain Triglav, Grintovec and Šija. The analysis was carried out by the means of comparison with ortophoto and lidar data, but the following sources of data were used as well: building cadastre, cadastre of public infrastructure, eVode and topographic data DTM. The focus was put on reviewing three object groups: buildings, transport networks (roads and paths) and water (rivers and streams). A closer look was given to see if the quality of the data differs between the different cartographic platforms and the different types of test sites. The final results show that there are quality differences in both instances.
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