Abstract
Today, the amount of spatial data produced by users on the web is increasing rapidly day by day. This, of course, makes spatial data on the web into an important source of information especially for the development of spatial applications. Particularly with the open data policy, the spread and success of crowdsourced initiatives has prompted spatial data producer institutions and organizations to evaluate the possibilities of using crowdsourced geographic information in data collection. In this context, national mapping agencies either use open map resources created with a crowdsourcing approach to update their databases or develop mobile and web applications to collect data with a volunteered geographic information approach. From this point of view, in this study, POI data determined as part of the national mapping agency applications have been extracted from OpenStreetMap, Wikimapia and GoogleMaps map services and the differences between data sources have been assessed.