Martijn Tennekes en Edwin de Jonge

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Presentation transcript:

Martijn Tennekes en Edwin de Jonge The compositional dot map: a visualization of spatial data Martijn Tennekes en Edwin de Jonge

Dot Map A dot map shows the geographic distribution of units, e.g. persons, companies, or events. Deaths per address Water pumps Map of cholera outbreak in Londen (1854) by John Snow

Compositional Dot Map A compositional dot map shows both distribution and composition of a population. Composition is shown by color. Racial Dot Map: one dot per person (USA) http://demographics.virginia.edu/DotMap/

Dutch Population by Ethnic Origin Interactive map: http://research.cbs.nl/colordotmap/EN/ One dot represents one person Dots are colored by ethnic origin To protect privacy, dots are distributed randomly per neighbourhood

Dutch Population by Ethnic Origin http://research.cbs.nl/colordotmap/EN/ Chroma Pixel colors are selected from the HCL color space: Hue for composition Luminance and Chroma for density Luminance Hue

Software Implementation Tile Server: Technique commonly used, e.g. in Google Maps. Contains 1.3 million 256 x 256 png images (3GB) Created with , using tmap, png, raster and doParallel packages. Interactive map: Draft version only required a few code lines in , using tmap and leaflet package. Final map implemented in HTML and JavaScript (leaflet library).

Further Research Conduct user tests to evaluate dot map. Use Basic Register of Addresses and Buildings (BAG) instead of Land Use to distribute the dots. Current distribution using Land Use Distribution using BAG Thanks to Jan van der Laan Create dot maps for other data. How to visualize more than 3 categories? How to visualize two or more variables, e.g. level of education and income?

References http://research.cbs.nl/colordotmap/EN/ Statistics Netherlands (2017) CBS Experimenting with Dot Maps. Online article. https://www.cbs.nl/en-gb/our-services/innovation/project/cbs-experimenting-with-dot-maps . Statistics Netherlands, Heerlen, The Netherlands. Tennekes, M., Jonge E. de (2016) Coloring interactive compositional dot maps. Poster paper presented at the 18th EG/VGTC Conference on Visualization (EuroVis 2016), Groningen, The Netherlands. http://research.cbs.nl/colordotmap/EN/