Abstract: We are trying through this study, to expose data fusion process. In fact, Data Fusion approach is nowadays estimated as a great solution held for accuracy and precision problems applications. Fusion scheme is actually deemed as a new technology, which could be integrated in many scientific fields and could moreover offer many successful results. Many approaches proposed schemes and architecture steps for this concept. Thus, we are trying to propose an overview of these. We will also, as a second step, deal with the importance of space dimension in geographic applications. New research fields such as mobile location are included. In addition, temporal dimension and environment integration could be interesting and provide more accuracy for such applications. That’s why, a particular attention will be paid for this point.