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End date: 1981 × Start date: 1981 ×

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    TOWN PLANNING AIDED BY AN INTEGRATED MUNICIPAL LAND INFORMATION SYSTEM
    (The Eurographics Association, 1981) Eloranta, Kirsi; J. L. Encarnacao
    The 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.
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    SOME USEFUL BUT RATHER UNUSUAL GRAPHICAL PRIMITIVES
    (The Eurographics Association, 1981) Magnenat-Thalmann, Nadia; Thalmann, Daniel; Bergeron, Philippe; J. L. Encarnacao
    The MIRALIB library is a powerful graphical library which may be used with MIRA-2D, a graphical PASCAL extension as well as with the standard PASCAL language. MIRALIB includes figure algebra routines, figure measure functions, figure recognition predicates, image transformations as fitting or clearing and animation primitives. The most unusual primitives are presented with the help of a few examples.
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    ABSTRACT DATA TYPE BASED PROGRAMMING STYLE AND COMPUTER GRAPHICS
    (The Eurographics Association, 1981) Giloi, W. K.; J. L. Encarnacao
    The next generation of "intelligent" industrial robots will necessitate off-line programming systems in which generative graphics (picture generation) and cognitive graphics (picture understanding) is combined. This will require programming languages that comprise graphical data types. The classical implementation of a graphical programming system in the form of a procedure package deals with representations of graphical objects and thus does not provide graphical data types. However, modern abstract data type based languages allow graphical data types to be introduced as user-defined abstract data types. The features of such a language, CLU, is discussed, and the implementation of a graphical data type in CLU is illustrated by a simple example.
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    COMPUTER AIDED DESIGN LANGUAGE 'CADLAN'
    (The Eurographics Association, 1981) Bigelmaier, Anton; Brunner, Helmut; Strack, Helmut; J. L. Encarnacao
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    TELIDON: WHERE VIDEOTEX MEETS COMPUTER GRAPHICS
    (The Eurographics Association, 1981) Newman, Hannah; J. L. Encarnacao
    Videotex is a system by which information can be accessed from central data bases by the general public. By the use of a television receiver augmented by a micro-computer controlled interface device, a user can access pages of information over a communications medium. Telidon uses a coding method for the transmission of graphical and textual information which is device and communication channel independent. Pictures are encoded using geometric primitives called Picture Description Instructions. Standards for graphics metafiles are being developed. Cornpatibility of Telidon and computer graphics can be obtained by developing a graphics metafile in which the requirements for both are satisfied.
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    Computer Graphics for Federal Planning in West-Germany
    (The Eurographics Association, 1981) Rase, Wolf D.; J. L. Encarnacao
    To satisfy the cartographic requirements for spatial analysis, planning and forecast on the federal level in West Germany the Federal Research Institute for Regional Geography and Regional Planning established a system for computer-assisted production of thematic maps. Development priority was given to choropleth and graduated symbol maps as the most important mapping techniques to display spatial disparities. Other, less frequently used techniques, e. g. network display, surface representation, perspective drawings, etc., have also been implemented to provide additional aids for visualization, and to reduce the bottlenecks in the manual production process.
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    EXTRACTING LINE MAPS FROM IMAGES
    (The Eurographics Association, 1981) Jimenez, Javier; Navalon, Jose L.; J. L. Encarnacao
    We present methods to vectorize automatically information given in raster form, the algorithms used are discussed briefly, and results for some test cases are presented. The compression of information is discussed as well as some theoretical models.
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    APPLICATION OF GINO-F TO USE DISPLAY FILE TECHNIQUES ON RASTER SCAN DISPLAYS
    (The Eurographics Association, 1981) Bramer, B; Sutcliffe, D C; J. L. Encarnacao
    Raster scan displays are now available at lower costs than vector refresh displays. While many offer more facilities such as fill area and colour or greyscale capabilities, few offer a display file facility. It is desirable to use raster scan displays from line drawing graphics packages with support for devices with display files and so a project was undertaken to use an external display file with raster scan displays. A special device driver was written, for the GINO-F graphics package, with facilities for picture segmentation, segment identification using light pen simulation and picture segment manipulation.
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    Graphics Standards - Where are we ?
    (The Eurographics Association, 1981) Hagen, Paul J.W. ten; J. L. Encarnacao
    An overview is given of the state of the standardization efforts of ISO/TC97/SC5/WG2, which currently concentrate on GKS. The standardization activities are illustrated by presenting a recently incorporated concept of bundling. An outlook on future activities Is presented.
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    SMOOTHING A DIGITIZED CURVE BY DATA REDUCTION METHODS
    (The Eurographics Association, 1981) Opheim, Harald; J. L. Encarnacao
    In order to reduce storage and subsequent processing costs for a digitized cartographic curve, we may wish to reduce the data set. The data reduction method which is described in this paper, can be used on-line during the digitizing as well as afterwards on the total data set. We only wish to retain the salient points, and thus data reduction can be regarded as a tool for smoothing a curve. The paper also describes another way of smoothing, based on signal theory.