M.Sc. Tezi Görüntüleme

      In this thesis, a framework was defined for geoportals which is the most popular method for the worldwide National Spatial Data Infrastructures (NSDI) activities. This framework includes three components. These are “rapid geoportal development”, “web service composition in Geoportal environments”, “open and free geoportal development”. The rapid geoportal development would enable a rapid development of portal by developers which is valuable especially for countries that have been late in adopting an NSDI. We realized the rapid geoportal development component with geoportals which are developed with standarts. Thus, the “re-usabilty” and “interoperability” problems for geoportals are dealt with. Web Service Composition (WSC) at geoportal environment component is developed to provide more complicated services than search, view and download services for portal users. Portal technology for WSC was studied for in terms of which has not been realized in the way that it should be in the Spatial Data Management Communities. Web Processing Service which is an OGC standard was used for realizing spatial analysis at geoportal environment. Classification of the WSK methods at WPS standard was examined and a new classification is offered for this standard. In this study, current WPS servers were examined as well. Some shortcomings of these servers were identified and solutions for these were offered. With open and free geoportal development component, the idea that a geoportal can be developed completely with open and free software has been proven.