IEEE Computer Graphics and Applications

Issue 2 • March 1993

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Displaying Results 1 - 9 of 9
  • NTSC: nice technology, super color

    Publication Year: 1993, Page(s):17 - 23
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (671 KB)

    The National Television System Committee's (NTSC's) color TV encoding scheme is discussed. The history and theory of NTSC are reviewed. The operations of the NTSC coders and decoders are described. Results of some semiscientific experiments on the NTSC signal are presented.<> View full abstract»

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  • Landscape visualization with Emaps

    Publication Year: 1993, Page(s):28 - 33
    Cited by:  Papers (6)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (641 KB)

    Emaps, a comprehensive environment for displaying geographic data, written in object-oriented Common Lisp and running on a Macintosh computer, is described. In Emaps, a hierarchy of objects-windows, maps, cells-takes advantage of the class-instance inheritance and generic methods of Common Lisp to allow prototyping and exploring of variations. The combination of a class library of objects, a proto... View full abstract»

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  • Visualizing environmental data at the EPA

    Publication Year: 1993, Page(s):34 - 38
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1021 KB)

    Several environmental visualization projects being pursued by the US Environmental Protection Agency are discussed. One group develops models for the transport and deposition of airborne pollutants. Another group evaluates the positions of air quality monitoring sites with respect to the distribution of pollutants. Other researchers collaborate with investigators at NASA Langley and Lawrence Liver... View full abstract»

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  • Visualizing soil surfaces and crop residues

    Publication Year: 1993, Page(s):40 - 47
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1887 KB)

    A test case for visualizing field and laboratory data pertaining to soil erosion and infiltration is examined. Several visualization techniques were used to derive image data from an experiment in which the effect of a sequence of five rainfalls on a laboratory-formed soil surface was measured. The base data are millimeter-resolution elevation models generated using a laser-scanning device. The su... View full abstract»

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  • Assessing interpolation accuracy in elevation models

    Publication Year: 1993, Page(s):48 - 56
    Cited by:  Papers (69)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2676 KB)

    Methods that identify the spatial variation in elevation model accuracy and highlight relative variation are proposed. Visualization within the geographic resources analysis support system (GRASS) is used to identify the accuracy preserved in interpolation digital contour data to produce elevation models. The interpolation routines are inverse distance weighting, contour flood filling, simultaneou... View full abstract»

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  • Graphics for environmental decision making

    Publication Year: 1993, Page(s):58 - 64
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1145 KB)

    Applications, problems, research needs, and future requirements of visual decision support systems, the systems relied on for environmental care and planning, are discussed. Environmental decision software, visual techniques, data types, and geometries are outlined. The examples of environmental applications for visual decision support systems-pollution monitoring and water risk assessment-are pre... View full abstract»

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  • Extracting area objects from raster image data

    Publication Year: 1993, Page(s):68 - 73
    Cited by:  Papers (3)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (849 KB)

    An algorithm for extracting the spatial objects contained in raster image data is presented. Input to the algorithm is a Siemens computer-aided design (SICAD)-Hygris raster file representing a classification of the plane. Output of the algorithm is a SICAD geographic information system (GIS) external file containing the topologically complete definitions of all area objects and their constituents,... View full abstract»

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  • A parallel intersection algorithm for vector polygon overlay

    Publication Year: 1993, Page(s):74 - 81
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (735 KB)

    A parallel intersection algorithm for speeding the creation of a composite network of polygons whose identities relate to the original polygons from which they are formed in vector geographic information systems (ISs) is described. The algorithm reduces unnecessary intersection checking, especially when polygon density is high. Single-stream and multiple-stream versions of the algorithm are discus... View full abstract»

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  • Graceful interaction with graphical constraints

    Publication Year: 1993, Page(s):82 - 91
    Cited by:  Papers (5)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1064 KB)

    The graphical constraint editor (GRACE), a graphical editor that lets users define graphical, or geometric, constraints, is reviewed. Graphical constraints specify relationships among graphical objects that the system must maintain. Constraints are useful in graphical drawing editors, design activities supported by CAD systems, and graphical user interface construction. GRACE provides mechanisms f... View full abstract»

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IEEE CG&A bridges the theory and practice of computer graphics. From specific algorithms to full system implementations, CG&A offers a unique combination of peer-reviewed feature articles and informal departments, including product announcements.

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Meet Our Editors

Editor-in-Chief
L. Miguel Encarnação
The QED Group