Abstract
This paper presents a method to preserve security in GIS databases and describes a polyinstantiation approach to prevent covert channel in a multilevel secure spatial database. Usually, security is handled by giving users permissions/privileges and database objects security levels. In the case of GIS objects, the complex relationships among them (spatial, topological, temporal, etc.) mean that extra care must be taken when giving levels; otherwise users may see something they are not authorized to see or may be denied access to needed information. Currently, database security is combined with the spatial database system on the fields of facility management, air-traffic control and military area. Although much research in the field of database security have been made, there has been no study in the field of secure spatial database[1,2].
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