Maps and the Geospatial RevolutionLesson 5 – Lecture 2Anthony C. Robinson, Ph.DLead Faculty for Online Geospatial Educatio...
Choosing Colors• Colors on thematic maps should correspond tothe type of data you’re trying to show– Do you have numerical...
Sequential Colors
Sequential Colors
Diverging Colors
Qualitative Colors
Rainbows Kill People• Rainbow (spectral) color schemes are commonly misused onmaps– Weather maps showing precipitation amo...
Rainbows Kill People
Rainbows Kill People
Data Classification• Assigning observationsto categories is calleddata classification• Three major types toknow– Equal Int...
Equal Interval Classification
Quantile Classification
Natural Break Classification
Text On Maps• Designing text onmaps is a majoraspect ofcartography• Choosing fonts andpositioning labels canbe a daunting ...
Maps and the Geospatial Revolution www.coursera.org/course/mapsTwitter @MapRevolutionOnline Geospatial Education @ Penn St...
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Maps and the Geospatial Revolution: Lesson 5, Lecture 2

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These are the slides to accompany the second lecture from Lesson 5 of Maps and the Geospatial Revolution on Coursera.

www.coursera.org/course/maps/

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Maps and the Geospatial Revolution: Lesson 5, Lecture 2

  1. 1. Maps and the Geospatial RevolutionLesson 5 – Lecture 2Anthony C. Robinson, Ph.DLead Faculty for Online Geospatial EducationJohnA. Dutton e-Education InstituteAssistant Director, GeoVISTA CenterDepartment of GeographyThe Pennsylvania State UniversityThis content is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License
  2. 2. Choosing Colors• Colors on thematic maps should correspond tothe type of data you’re trying to show– Do you have numerical or categorical data?• Color schemes include three major types– Sequential (less -> more)– Diverging (above and below an average)– Qualitative (pizza, currywurst, and tonkatsu)
  3. 3. Sequential Colors
  4. 4. Sequential Colors
  5. 5. Diverging Colors
  6. 6. Qualitative Colors
  7. 7. Rainbows Kill People• Rainbow (spectral) color schemes are commonly misused onmaps– Weather maps showing precipitation amounts– Every “heat map” floating around• They’re bad because they often use qualitative colors to showsequential or diverging data– Is blue more than yellow? Is purple more than blue?• They also can kill people– Doctors interpreting medical images of the heart made worsedecisions about their patients using rainbow schemes than simplesequential schemes
  8. 8. Rainbows Kill People
  9. 9. Rainbows Kill People
  10. 10. Data Classification• Assigning observationsto categories is calleddata classification• Three major types toknow– Equal Interval– Quantile– Natural Breaks
  11. 11. Equal Interval Classification
  12. 12. Quantile Classification
  13. 13. Natural Break Classification
  14. 14. Text On Maps• Designing text onmaps is a majoraspect ofcartography• Choosing fonts andpositioning labels canbe a daunting task– Labeling everystreet, building,etc… and makingthem all readabletogether
  15. 15. Maps and the Geospatial Revolution www.coursera.org/course/mapsTwitter @MapRevolutionOnline Geospatial Education @ Penn State www.pennstategis.comThis content is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License

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