Download Map-based Mobile Services: Theories, Methods and by Liqiu Meng, Alexander Zipf, Tumasch Reichenbacher PDF

By Liqiu Meng, Alexander Zipf, Tumasch Reichenbacher

The booklet is split into 3 components: idea, strategy and implementation. beginning with a precis of the cutting-edge in cellular applied sciences, the 1st half analyses their affects on cartography and pinpoints the lacking theories fascinated by the advance of map-based cellular companies. A conceptual framework of cellular cartography is then brought with the emphasis on cellular utilization context. the second one half is dedicated to the layout technique lower than the limitations outlined within the theoretical framework. A middle factor bargains with personalized cellular map companies. the ultimate half demonstrates the feasibility of the tools by utilizing software eventualities. The accompanying CD-ROM comprises the PDF-Files in color.

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Mustière, S. and Moulin, B. (2002): What is Spatial Context in Cartographic Generalisation?. IAPRS & SIS, Geospatial Theory, processing and Applications, Vol. 34, No. 4, Ottawa, Canada, 8-12 July, pp. 274-278 O'Neill, R. W. Michael: Or why are there so many books on scale?. L. T. Parker, Eds. Columbia University Press, pp. 3-15. , and Unwin, D. (2003): Geographic Information Analysis. Hoboken, New Jersey: John Wiley. Palmer, S. E. (1978): Fundamental aspects of cognitive representation. In Cognition and categorization, E.

Displacement operator on a point set Summary of generalisation operators. 1 summarises the different generalisation operators according to their abilities for reducing the level of detail in the map and explicitly resolving graphical conflicts. Tab. 1. Summary of generalisation operators Operator Global Selection Local Selection Simplification Aggregation Typification Displacement Reduces level of detail Yes Yes Yes Yes Yes No Resolves graphical conflicts No Yes No No Yes Yes Strategies for generalisation Generalisation is usually decomposed into two sequential stages of processing: model generalisation and (carto)graphical generalisation.

7. Transformation x x Conformal Uniform scaling Angles and relative lengths preserved Parallel lines preserved Translation x Parallel lines preserved Affine Shearing Scaling Projective Fig. 7. Distortions of the grid expressed as transformations. 6a) can essentially be seen as a partitioning of the space of possible transformations according to the severity with which different transformations degrade the preservation of angles. The interesting point, for the generalistion process, gained from these observations is that they present a view of generalisation from the perspective of generalizing the properties of the space itself rather than generalizing the spatial arrangements of feature within the space.

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