Automated placement of supplementary contour lines |
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Authors: | Timofey Samsonov Sergey Koshel Dmitry Walther Bernhard Jenny |
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Affiliation: | 1. Department of Cartography and Geoinformatics, Faculty of Geography, Lomonosov Moscow State University, Moscow, Russia;2. Faculty of Information Technology, Monash University, Melbourne, Australia |
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Abstract: | Supplementary contour lines are placed between regular contour lines to visualize small but important forms that regular contour lines are unable to show. On topographic maps, typical forms are hillcrests, depressions, saddles, terraces, banks, and levees. No automated method for the selection of supplementary contour lines has been described so far. We document cartographic design principles for the selection of supplementary contour lines for topographic maps, and present an automated method for their placement. Results of the automated method are similar to manually placed supplementary contour lines. Our method helps map authors to create contour line maps that more effectively illustrate relevant small details in maps showing terrain elevation or other scalar fields. |
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Keywords: | Supplementary contour line intermediate contour isoline isarithm isohypse |
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