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Item TOWN PLANNING AIDED BY AN INTEGRATED MUNICIPAL LAND INFORMATION SYSTEM(The Eurographics Association, 1981) Eloranta, Kirsi; J. L. EncarnacaoThe purpose of this paper is to describe the results of our recent land information systems research in The Institute of Geodesy at Helsinki University of Technology. Our goal is to make research on municipal systems by building pilot systems and also by studying technical implementation problems on theoretic basis. In this paper one of our pilot systems is described, the one that is designed for town planning applications. Generally the research project could be characterized by the following keywords: use of minicomputers, problem oriented approach, evolutive approach in systems design, applications oriented data base management and integration of urban land information systems.Item A SEMANTIC VIEW ON GEOMETRIC REPRESENTATION OF URBAN LAND INFORMATION(The Eurographics Association, 1982) Eloranta, Kirsi; D.S. Greenaway and E.A. WarmanIn this paper we deal with graphical representation of spatially referenced information. We introduce an approach to geometric representation based on the Entity-Attribute-Relationship (EAR)-model. Our object system is an urban municipality, especially the urban activities which create or utilize land related information. Among those activities we can distinguish certain sequence of information transformations. In this paper we try to describe the various representations of urban land information and the functional connections between then. The purpose of these descriptions is to define the requirements of geodata base structures derived from the semantic contents of information.