Abstract
The use of pervasive systems and positioning technologies is increasing to track moving objects in several domains such as: health care, bioinformatic, natural diseases, etc. The modeling and the analysis of trajectory data resulting from moving objects activities have become a necessity in order to make the best decision. Tracking every movement leads to storing large volumes of data. The obtained trajectory data can be classified in two main categories: certain and uncertain data. Unfortunately, uncertain data are not taking enough consideration though them importance. Therefore, in this paper, we will present a complete case study that represents the ambulance trajectory by considering every possible case of uncertainty and using the fuzzy logic concepts.