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Outdoor objects represent some specific or distinguished special areas such as roads, parks, railways, and so on. Outdoor objects correspond to map objects in usual GIS systems. Topology objects are not actual physical objects. , nodes and links, path names, walking costs) to represent human and object flows in the environment. Using such a coordinated means of representing and handling spatial objects in SENSORD, querying spatial objects can be done independently from the classifycation of objects such as indoor or outdoor classification, which enables seamless viewing GUI in the SENSORD user interfaces presented in Fig.
In this manner each user extracts a sub-certiﬁcate from the original one which only contains needed information for each speciﬁc situation. Thus, the challenge is: how each user can customize her static certiﬁcates according to a contextual situation? To solve this problem, we must distinguish The Dynamic Part from the Static Part. The Static Parts: is composed of mandatory and non changeable data (ex: the ID of the certiﬁcate, the time of validity). These data set up the identity of the certiﬁcate.
The sensor shown in the second example is “Passer Counter,” as described in the ‘type’ attribute. The specified spatial region in this example represents the reactionregion (sensible-region) of the sensor. This object also has a URI field by which users can access the sensor via TCP/IP. Users can query about spatial objects included in a specific rectangle or polygon, by sending the corresponding rectangle or polygon object to SENSORD middleware (Fig. 6). The SENSORD middleware memorizes already queried regions; it can thereby avoid redundant data transmissions.