A scalable , object-oriented gis framework

This paper presents the underlying philosophy and design rationale of GinisNT, a scalable, OO framework for developing GIS applications. The fundamentals of GinisNT is an OO data model and an OO application development methodology. GinisNT OO data model supports all important concepts found in OO theory and is actually implemented on top of the relational data model. GinisNT automatically maps between the two data models, thus making the usage of a RDBMS transparent to the user, who can concentrate on the application itself. While developing the user interface, we have taken into account existing knowledge and ways of handling spatial data of our prospective users, so no training is needed for the users to start working with GinisNT. Furthermore, no additional funding is required also, as the framework is based on cheap hardware platforms and existing software infrastructure (RDBMS). GinisNT is currently under development, as well as the first GIS application based on it, which is a telephone network maintenance system. We believe that the sound foundation of the framework will ensure fast development of high-quality GIS applications. ∗Presented at the International Society for Photogrammetry and Remote Sensing “Workshop on New Developments in Geographic Information Systems,” Milan, Italy, 6-8 March 1996.