Identification of Partially Occluded Map Symbols

Jari Korpi, Mohammad Haybatollahi, Paula Ahonen-Rainio

    Research output: Contribution to journalArticleScientificpeer-review


    Maps should be legible at all scales, and the information density of a map should be adapted to fulfill this goal. However, there are situations in which overlapping symbols might not be easily avoided. These kinds of cluttered or over-plotted situations often occur today in geovisual analytics and in map mash-ups created using Web 2.0 technologies. In this research project, we examine via a user test the extent to which occluded symbols can still be identifiable. Specifically, we tested how different levels of occlusion affected the accuracy and response time of finding symbols that varied in either color hue, abstract shape, or pictogram. The results of the test show that the efficiency of the symbols decreases when the symbols become partially occluded. Still, even half-occluded complex shapes can be identified quite accurately. Symbols varying in color hue seem to tolerate occlusion the best.
    Original languageEnglish
    JournalCartographic Perspectives
    Pages (from-to)19-32
    Number of pages14
    Publication statusPublished - 2014
    MoE publication typeA1 Journal article-refereed

    Bibliographical note

    Korpi, J. A., Haybatollahi, M., & Ahonen-Rainio, P. (2014). Identification of partially occluded map symbols. Cartographic Perspectives, (76), 19-32.

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