The quality and availability of positional information (loc-ation, orientation) is a key resource that strongly influ-ences the way in which many systems incorporating spa-tial information can provide services to their user. In this extended abstract, we discuss a number of issues and ideas on how to cope with low-quality positional inform-ation, how to improve that quality and how integrating
... [Show full abstract] qualitative and quantitative approaches may be beneficial in this context. We present a number of examples from systems that we developed in the past and that we are currently developing, and we point out possible improve-ments.