Geovisualization

It is visualizing something with locations. One type of Data visualization. It often involves Geocoding.

• http://en.wikipedia.org/wiki/Map, http://en.wikipedia.org/wiki/Cartography

Challenges

• Theorema Egregium
• All maps of parameter estimates are misleading
• Cognitive and Usability Issues in Geovisualization

Examples

• The true size of Africa
• http://www.chromeexperiments.com/globe
• a map of every person counted by the 2010 US and 2011 Canadian censuses.
• American Migration
• Net Migration Patterns for US Counties
• wind map
  • Earth wind map Source code
• Countries by Area
• https://app.atlas.co/projects/Qjtg3CyP1TB126eDnS9Q?loc=-122.6877%2C45.5013%2C10.8315z&co=69%2C34 - portland housing density

Methods

• Cartogram
• Choropleth
• Map projections
• Flowlines

Regional smoothing

• Pudding: Regional smoothing using R

People

• Cynthia Brewer

Tools and tips

• https://protomaps.com
• D3
  • topojson
  • Let’s make a map
• Processing:
  • map() link is a useful function.
• Polymaps - A Javascript library for drawing maps in SVG.
  • http://blog.simplegeo.com/post/983045400/announcing-polymaps
  • http://flowingdata.com/2010/08/20/design-advanced-online-and-interactive-maps-with-polymaps/
• Cartogram
• http://code.google.com/p/webgl-globe/ - “The WebGL Globe is an open platform for geographic data visualization created by the Google Data Arts Team.”
• http://unfoldingmaps.org/ - Processing / Java library
• http://kartograph.org/
• Vincent
  • http://wrobstory.github.io/2013/04/python-maps-chloropleth.html
• folium
• https://deck.gl

Python

• GeoPandas
• Visualizing Geographic Data With Python
• https://github.com/developmentseed/lonboard

R

• How to visualise a billion rows of data in R with Apache Arrow

Data

• http://www.census.gov/ - U.S. Census
• http://www.naturalearthdata.com - Free vector and raster map data at 1:10m, 1:50m, and 1:110m scales
• http://www.euratlas.net/history/index.html - historical maps
• http://sedac.ciesin.columbia.edu/gpw/global.jsp - Gridded population of the world
• http://cartodb.com/ - geospatial database. provide API
  • HTML5 experiments
    • http://vizzuality.github.com/HTML5-experiments/d3/US-county-area.html

Formats

• Shapefile

Links

Articles

• http://flowingdata.com/2009/11/12/how-to-make-a-us-county-thematic-map-using-free-tools/ - A nice tutorial of Flowing data blog.
• http://btk.tillnagel.com/tutorials/geo-tagging-placemaker.html - Till Nagel: Processing geo information in Wikipedia articles
• http://www.41latitude.com/post/1268734799/google-styled-maps
• TileMill for Processing by Till Nagel
• Visualization deconstructed: Why animated geospatial data works
• http://eagereyes.org/zipscribble-maps
  • interactive Zipscribble map
• Great circles
  • flowing How to map connections with great circles
  • http://paulbutler.org/archives/visualizing-facebook-friends/
  • http://stackoverflow.com/questions/7238284/automating-great-circle-map-production-in-r

Maps

• http://en.wikipedia.org/wiki/Equirectangular_projection
• http://commons.wikimedia.org/wiki/File:USA_Counties_with_FIPS_and_names.svg - US county map in svg format.
• http://commons.wikimedia.org/wiki/File:BlankMap-FlatWorld6.svg - Blank world map. parallel lat & lng.
• http://visibleearth.nasa.gov/view_rec.php?id=2430

Korea

• http://sgis.kostat.go.kr/contents/shortcut/shortcut_05.jsp - Korean maps & census. need to submit a request to access the data?
  • http://sgis.kostat.go.kr/contents/shortcut/shortcut_10.jsp - Apparently, you can download the shape files here.