SME
College · Science
Cartography
4 topics
Geography
Before this course
Topics
Map projections
Main lesson
Cylindrical equal-area map
Use this for “On a cylindrical equal-area map of a 10 cm globe, how high is 60° N drawn, and how are shapes stretched there?”
What a projection keeps
Use this for “The Mollweide map keeps every country’s area true but bends shapes near its edges. Is it conformal, equal-area, equidistant or a compromise?”
Scale and coordinate systems
Thematic mapping
Main lesson
Rates, not counts, on a choropleth
Use this for “County A has 340 cases among 85,000 people; county B has 900 among 450,000. Which county should be shaded darker on a choropleth?”
Proportional-symbol radius
Use this for “The largest city, 1,000,000 people, gets a 20 mm circle. How big a circle does a city of 250,000 get?”
Best thematic map for the data
Use this for “You have the median household income of every county in a state. Which kind of thematic map shows it best?”
Map design
Course test
See what you know: 10 questions on this course
New questions each time. Pass to mark it complete.