A cartogram is a map in which the geometry of regions is distorted in order to convey the information of an alternate variable . The region area will be inflated or deflated according to its numeric value.
How does a cartogram map show spatial data?
A cartogram is a map produced using a cartographic technique where the mapped polygons (e.g., county or state boundaries) are stretched or shrunk based on the magnitude of the variable being mapped .
What would you use a cartogram map for?
Cartograms are used for thematic mapping . They are a particular class of map type where some aspect of the geometry of the map is modified to accommodate the problem caused by perceptually different geographies.
What types of data are best measured by cartograms?
Nominal, Ordinal, and Numerical Data
Area cartograms need numbers in order to scale the sizes of places; without numbers, there is nothing drive the map symbols. The same is true with graduated symbol maps, choropleth maps, and dot density maps.
Why is cartogram important in geographic analysis?
Whatever their name, cartograms are unique representations of geographical space . Examined more closely, the value-by-area mapping technique encodes the mapped data in a simple and efficient manner with no data generalization or loss of detail. Two forms, contiguous and non-contiguous, have become popular.
When should you not use a cartogram?
When Not to Use a Cartogram
Maps depend on variation in scale to represent a large area and a cartogram is not a true representation of the real-world area and may give incomplete information. One of the disadvantages of the cartogram is that it inevitably changes the visual representation of geography.
What is a cartogram example?
An area cartogram is a map that alters an entire physical location by scaling a chosen economic, social, political, or environmental factor . Take total population for example, the area cartogram to the right displays the current world population of 7.2 billion people.
Why do Cartograms look so strange?
In the case of cartograms, by scaling features to have a size proportional to a variable other than their actual size, the danger is that the features will be distorted to the degree that they are no longer recognizable to map readers, making them less useful.
What are the disadvantages of a Isoline map?
| Advantages Disadvantages | You can see gradual changes They are very time consuming to make | They avoid the problem of boundary lines. They can be difficult to read if the lines are very close together, and the numbers and lines are very small. |
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Which is the best example of qualitative data used by geographers?
Which is the best example of qualitative data used by geographers? Smartphones, each one with a tiny GPS pinging , have revolutionized cartography.
What do Choropleth maps show?
Choropleth maps use the Counts and amounts (Color) smart mapping symbol type to show normalized data as shaded points, lines, or areas . Choropleth maps help answer questions about your data, such as: How do rates or percentages compare by geographic feature?
Why do Cartograms look like distorted maps?
Cartograms exaggerate the size of the geography proportional to the statistic being shown . Specifically, the variable substitutes land area or distance. But what they do is really distort our view of mapping by breaking the golden rule – sacrificing geometry to convey information.
What is pictogram and cartogram?
A pictogram, also called a pictogramme, pictograph, or simply picto, and in computer usage an icon, is a graphic symbol that conveys its meaning through its pictorial resemblance to a physical object. ... A pictogram is a chart that uses pictures to represent data .
What does cartogram mean?
: a map showing geographically diagrammatic statistics of various kinds usually by the use of shades , curves, or dots.
Who invented the cartogram?
French economist, geographer and educator Pierre Emile Levasseur is the pioneer of the use of cartogram-like representations in school textbooks. The above figure shows an example taken from page 778 of his geographic textbook, “La France, avec ses Colonies...” published in Paris in 1875.
