Spatial data are used for location based services and to support traffic management systems. Data are gathered, saved and managed in a central database where, in principal, every user can access them putting data in a temporary database and then integrate them to a central. The proposed system uses a connection between database and trust engines in order to provide transparency. Security is an important aspect in our system to give confidence to the users to use their online services. We present an architecture for the implementation. The implemented system has been used in a small scenario for traffic information in a city center.