Abstract
Geospatial data refers to the resources associated with location information represented by longitude and latitude. Its increasing availability and the tools to integrate and visualize the various types of data facilitate conducting sophisticated analysis and discovering hidden patterns. Therefore, uncontrolled dissemination of geospatial data may have grave consequences for national security and personal privacy. Access control for this data is based on its geospatial location, content and context, the credentials and characteristics of the users requesting access as well as the time at which the data is captured and requested. In this chapter, we review the different access control models proposed by researchers for controlled dissemination of geospatial data. Since geospatial data is increasingly obtained from third party Web services, we also review the security models presented in the area of geospatial Web services.