A double continuous approach to visualization and analysis of categorical maps

Tomislav Hengl, Dennis J.J. Walvoort, Allan Brown, David G. Rossiter

Research output: Contribution to journalArticleAcademicpeer-review

27 Citations (Scopus)

Abstract

A method to visualize multiple membership maps, called ‘Colour mixture’ (CM) is described and compared with alternative techniques: defuzzification and Pixel mixture. Six landform parameters were used to derive the landform classes using supervised fuzzy k-means classification. The continuous categorical map is derived by GIS calculations with colours, where colour values are considered to represent the taxonomic space spanned by the attribute variables. Coordinates of the nine class centres (landform facets) were first transformed from multivariate to two-dimensional attribute space using factor analysis, and then projected on the Hue Saturation Intensity (HSI) colourwheel. The taxonomic value was coded with the Hue and confusion with Saturation. To improve visual impression, saturation was replaced with whiteness. Classes that were closer in attribute space were merged into similar generic colours. The CM technique limits the derived mixed-colour map to seven generic hues independently of the total number of classes, which provides a basis for automated generalization. The confusion index derived from the mixed-colour map was used to derive primary boundaries and to locate areas of higher taxonomic confusion.
Original languageEnglish
Pages (from-to)183-202
JournalInternational journal of geographical information science
Volume18
Issue number2
DOIs
Publication statusPublished - 2004

Keywords

  • ADLIB-ART-2316
  • ESA
  • n/a OA procedure

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