Presentation on theme: "ENV 200610.1 Envisioning Information Lecture 10 – Cartograms: A different way of drawing maps Ken Brodlie"— Presentation transcript:
ENV Envisioning Information Lecture 10 – Cartograms: A different way of drawing maps Ken Brodlie
ENV Choropleth Maps Maps have been traditionally drawn to represent area –With topography indicated by shading Increasingly we use maps to represent properties about areas –Here each state is shaded according to density of population –Known as choropleth mapping
ENV Discuss Strengths and Weaknesses StrengthsWeaknesses
ENV Cartograms The cartogram is a response to these issues –Rather than accurately reflect the area and superimpose shading to represent the variable.. –.. Distort the area so as to reflect the variable directly
ENV Types of Cartogram Cartograms can be contiguous or non-contiguous –Here is population of California by county as a contiguous cartogram
ENV Types of Cartogram.. And now as a non-contiguous cartogram
ENV Contiguous and Non-Contiguous Cartograms Here is the US population example in both styles…
ENV World Population Cartogram Acknowledgement: Examples taken from Web site of Dr Donald House
ENV George Bush – Victory large or small?
ENV Types of Cartogram Danny Dorling (recently Professor in Leeds) invented a special type of cartogram using circles of different size
ENV Dorling Cartograms Try the applet at:
ENV British county populations evolving…
ENV Chernoff Face Cartogram! Acknowledgement: –Last two slides from Cartograms for Human Geography, by D. Dorling, in Visualization in Geographical Information Systems, Wiley.