1GeovisualizationCS 4460/7450 - Information VisualizationApril 9, 2009John StaskoCaveat• This lecture is woefully inadequate• Just not enough time… sighSpring 2009 2CS 4460/74502Map• Representation of spatial relations• Locations identified by labelsSpring 2009 3CS 4460/7450Choropleth MapAreas are filledand coloreddifferently toindicate someattribute of thatregionSpring 2009 4CS 4460/74503Geovisualization• Has been around a long time, precedes InfoVis− Roots perhaps a little more in SciVis• Also, GIS: Geographic Information SystemsSpring 2009 5CS 4460/7450Common Visualization• Provide a choropleth-style map and then augment with further information about each of the regions• Augmentations may include other infovis techniques such as parallel coordinates, box plots, etc.Spring 2009 6CS 4460/74504VIS-STAMPGuo et alTVCG‘06Spring 2009 7CS 4460/7450Challenge• Color may not be the best visual variable for encoding a quantitative value with each small region− Or color may be used for something else• So we want to use some other visual representation…BUT we still want to respect the geography as much as possibleSpring 2009 8CS 4460/74505RecMap• Have units of map be represented by rectangles• Roughly respect the geometry of their positions howeverSpring 2009 9CS 4460/7450Heilmann et alInfoVis ‘04Examples - 1Spring 2009 10CS 4460/74506Examples - 2Spring 2009 11CS 4460/7450Follow-on• Combine global shape function with local placement function− Combines cartogram-based layout with PixelMapsPanse et alTVCG‘06Spring 2009 12CS 4460/74507ExampleSpring 2009 13CS 4460/7450WORLDMAPPER• Shows countries of the world and distorts areas to represent quantitative variable on each• Standard color mapping – poorest to richest countries on rainbow scale• Complex algorithm for determining the layoutsDorling, Barford & NewmanTVCG‘06Spring 2009 14CS 4460/74508PopulationSpring 2009 15CS 4460/7450Tourism ProfitsSpring 2009 16CS 4460/74509HIV/AIDSSpring 2009 17CS 4460/7450Exported MedicinesSpring 2009 18CS 4460/745010Websitewww.worldmapper.orgSpring 2009 19CS 4460/7450Geographically Weighted Vis• Combine choropleth maps with other techniques such as boxplots and scalogramsDykes & BunsdonTVCG‘07Spring 2009 20CS 4460/745011Spatially-Ordered Treemaps• Basic treemap idea holds: area corresponds to some variable you care about• Position of nodes is influenced by geography though• Results: spatial squarified treemap algorithmWood & DykesTVCG‘08Spring 2009 21CS 4460/7450ExampleSpring 2009 22CS 4460/745012VAST Challenge• Have a lookSpring 2009 CS 4460/7450 23Upcoming• Casual InfoVis− ReadingPousman• Social Vis− ReadingViégasSpring 2009 24CS
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