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Barry Kronenfeld Cartograms
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NACIS
October 15, 2015
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Barry Kronenfeld Cartograms
NACIS
October 15, 2015
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Transcript
Where the People Are Barry J Kronenfeld Eastern Illinois University
Population Cartograms Barry J Kronenfeld Motivation 1: Aesthetics “...general readers
often find all forms of cartograms equally obscure, strange and difficult to follow.” - Manting Tao (2010)
Population Cartograms Barry J Kronenfeld A catalog of monsters?
Population Cartograms Barry J Kronenfeld Cartograms of a different era
Population Cartograms Barry J Kronenfeld
Population Cartograms Barry J Kronenfeld Motivation 2: Error Distribution USA
1.07x too large West Bank/Gaza Strip 3.22x too small Singapore 1.93x too small India 1.02x too small
Population Cartograms Barry J Kronenfeld Motivation 2: Error Distribution Benjamin
Hennig on the World Population Atlas hGp://www.viewsoftheworld.net/?p=832 possible error source??
Population Cartograms Barry J Kronenfeld Objectives 1. Create software for
manual cartogram construction 2. Manually construct USA states cartogram 3. Assess: r accuracy r aesthetics r feasibility
1. Software Environment for Manual Cartogram Construction
Population Cartograms Barry J Kronenfeld Cartogram Studio
Population Cartograms Barry J Kronenfeld Grid Transformation Framework source grid
target grid
Population Cartograms Barry J Kronenfeld Adjust Target Grid World Population
Atlas
Population Cartograms Barry J Kronenfeld Adjust Target Grid
Population Cartograms Barry J Kronenfeld Adjust Source Grid
Population Cartograms Barry J Kronenfeld Adjust Source Grid
Population Cartograms Barry J Kronenfeld Dot-Density Metaphor 1 dot =
5 million people
Population Cartograms Barry J Kronenfeld Adjustment Tools q Rectangle Transform
Tool q Line Transform Tool q Smudge Tool
Population Cartograms Barry J Kronenfeld Rectangle Transform Tool
Population Cartograms Barry J Kronenfeld Rectangle Transform Tool
Population Cartograms Barry J Kronenfeld Line Transform Tool
Population Cartograms Barry J Kronenfeld Line Transform Tool
Population Cartograms Barry J Kronenfeld Smudge Tool
Population Cartograms Barry J Kronenfeld Smudge Tool
2. USA States Population Cartogram
Population Cartograms Barry J Kronenfeld Construction Process
Population Cartograms Barry J Kronenfeld Construction Process
Population Cartograms Barry J Kronenfeld USA States Population Cartogram (final)
Population Cartograms Barry J Kronenfeld Source Grid as Dot-Density Map
3. Assessment
Population Cartograms Barry J Kronenfeld 3a. Accuracy Assessment 20% 30%
50% 15% 45% 40% POPULATION: SIZE: APPORTIONMENT ERROR: 5% 10% + = 15%
Population Cartograms Barry J Kronenfeld Error Comparison SCAPETOAD 0.52%
APPORTIONMENT ERROR CARTOGRAM STUDIO 0.22% APPORTIONMENT ERROR
Population Cartograms Barry J Kronenfeld Error Comparison
Population Cartograms Barry J Kronenfeld 3b) Aesthetic Assessment SCAPETOAD
(DIFFUSION ALGORITHM) CARTOGRAM STUDIO (MANUAL CONSTRUCTION)
Population Cartograms Barry J Kronenfeld Alabama
Population Cartograms Barry J Kronenfeld West Virginia
Population Cartograms Barry J Kronenfeld Wyoming
Population Cartograms Barry J Kronenfeld Oklahoma
Population Cartograms Barry J Kronenfeld OK, but what about regions
without straight borders?
Population Cartograms Barry J Kronenfeld Decide for yourself... SCAPETOAD CARTOGRAM
STUDIO
Population Cartograms Barry J Kronenfeld 3c. Feasibility q Work in
Progress r personal results r classroom experience
Population Cartograms Barry J Kronenfeld Conclusions q accuracy ! r
easy to handle small, high density regions q aesthetics ! r possible to preserve straight lines q feasibility !* r proof-‐‑of-‐‑concept demonstrated q Future Work: r User Testing & Distribution
Population Cartograms Barry J Kronenfeld USA Cartogram & Cartogram Transform
tool available on my website hQp://ux1.eiu.edu/~bjkronenfeld/
Population Cartograms Barry J Kronenfeld Cartogram Transform (ArcGIS Tool) Cartogram
as Projection
Population Cartograms Barry J Kronenfeld Mississippi & Columbia Rivers
Population Cartograms Barry J Kronenfeld Acknowledgements q EIU Council on
Faculty Research (CFR) Grant q Software built on Dot Spatial
Population Cartograms Barry J Kronenfeld Questions?