Exploring Tessellation Metaphors in the Display of Geographical Uncertainty

摘要: This paper explores in detail a new and effective metaphor for visualising choropleth map uncertainty. The “level-of-detail” has been shown here to communicate attribute uncertainty, but also spatial uncertainty as secondary expression. is delivered the viewer via regular tessellated output of Hexagonal or Rhombus (HoR) quadtree data structure, semi-transparent layer that lies on top (termed trustree when used this manner). For testing, multiple images were created with differing resolution levels from superimposed New Zealand 2001 census Dunedin City. An Internet survey was designed run, reveal visual metaphors communicates through. choice offered (1) level (or resolution) metaphor, where less (i.e. coarser cells) represents more sketchy), (2) clutter, structure can be sufficiently dense so cover information, effect hiding uncertain areas barrier). In case finer cells indicate Also, aimed determine usable tessellation express information. results showed representing effectively expressed, depending used.