274 Geographical Information Systems: Trends and Technologies
repositories or creating it from aerial photographs and satellite images
(Mäkelä 2006). As a consequence, many users and producers of spatial
data are not trained in geo-field and may not be aware of the existence and
number of problems that this kind of data may have (Delavar and Devillers
2010; Boin and Hunter 2005; Wang and Strong 1996).
On the other hand, even though the research related to spatial data
quality has a 30-year long tradition, it introduces concepts and techniques
that are complex and diffi cult to understand by typical users and there is lack
of approaches for solving real problems (Devillers et al. 2010). Furthermore,
spatial data quality can also be seen as a ...