Proportional Circle Map

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This is a proportional circle map, one in which the data for each region is represented by a circle proportional to the data. This map is range graded, meaning each circle's size represents a range of numbers, and not an exact number. This map shows American Indian population by state.

Line Graph

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A line graph shows a change in a variable over time with a continuous line.  This one shows world population throughout history. The population began to boom right after the Industrial Revolution.

GIS Map

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GIS maps combine data with a map. The data is geographically referenced, meaning where the data is displayed on the map is where the event happened in real life. This is an early GIS map made by John Snow, who mapped cholera cases in London. By looking at the frequency and location of the cases, he was able to find the source.

Regular Photo

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Maps convey information about an area, and are representations of space. Photos do this, and so photos are maps too. This is a photo of the rural town of Bethel, PA. Someone could possibly use this as a map. They could use it find where the lake is, where the houses are, where the road is, and where the hill is.

Ideograms

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Ideograms are graphic symbols that represent ideas or concepts. Chinese, Japanese, and Korean characters are example of ideograms. 

Univariate Choropleth Map

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A univariate choropleth map shows only one data set, unlike bivariate choropleth maps, which show two. This map shows change in divorce rates in the US. It is areally averaged, and it is also classed. 

Unclassed Choropleth Map

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An unclassed choropleth map uses a continuum of shading to display the data. Unlike with classed choropleth maps, these don't have colors that represent ranges of data. Instead, each color represents a specific data score. In unclassed maps it is difficult to show each individual score, but they are useful for making general judgments.We may not know what the exact scores are, but we do know that France is a darker color than Spain, so France has a higher fertility rate than Spain.