Quality of OSM data is indeed good!
The Po Ve Sham blog has published an article titled: OpenStreetMap in Athens – as accurate as London. The article summarises the work of Ms Ourania (Rania) Kounadi’s Master of Science dissertation titled: Assessing the quality of OpenStreetMap data. (Date: 30 August 2009, 81 pages)
The blog article states:
“The results show that for most of the roads in the evaluation area there was an overlap of 69% to 100% between OSM and HGMS datasets. The average overlap was very close to 90%. Her analysis also included attribute and completeness evaluation, showing that the quality is high on these aspects too.
So a pattern is starting to emerge showing that the quality of OSM data is indeed good in terms of positional accuracy. This is surprising at first glance – how come people who are not necessarily trained in geographical data collection and do not use rigorous quality assurance processes produce data that is as good as the authoritative data?”
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