World map
A map of most or all of Earth's surface.
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A world map is a map of most or all of the surface of Earth. Because of their scale, world maps must deal with the problem of projection, as rendering the three-dimensional Earth in two dimensions necessarily distorts geographic features, distances, and directions. These distortions reach extremes in world maps, and many techniques have been developed to balance accuracy with unavoidable distortion.
Charting a world map requires global knowledge of the Earth, its oceans, and its continents. For much of human history, from prehistory through the Middle Ages, creating an accurate world map was impossible, as less than half of Earth’s coastlines and only a small fraction of its continental interiors were known to any single culture. Knowledge accumulated rapidly with exploration beginning during the European Renaissance; most of the world’s coastlines had been roughly mapped by the mid-1700s, and the continental interiors by the twentieth century.
World maps generally focus either on political features, emphasizing territorial boundaries and human settlement, or on physical features, showing mountains, soil type, or land use. Geological maps depict surface characteristics as well as underlying rock, fault lines, and subsurface structures. Choropleth maps use color hue and intensity to contrast differences between regions, such as demographic or economic statistics. All world maps rely on a map projection, a method of representing a globe on a plane, each distorting geographic features, distances, and directions in some way.
The Mercator Projection, originally designed as a nautical chart, is perhaps the best known. Thematic maps focus on one or a few subjects, portraying physical, social, political, cultural, economic, sociological, or agricultural aspects. Historical maps, from the Iron Age to the early modern period, reveal past knowledge and the philosophical and cultural bases of cartography, serving as a means for scientists to distribute and pass on ideas.
Quick Facts
- Field
- Cartography
- Known for
- Representing most or all of Earth's surface, requiring map projections that distort geographic features
- Key challenge
- Distortion inherent in projecting a globe onto a plane
Facts from the source article.
Lore & Background
World maps depict most or all of Earth’s surface and, due to their scale, must contend with the problem of projection. Rendering the three-dimensional Earth on a two-dimensional plane inevitably distorts geographic features, distances, and directions; these distortions become extreme in world maps. Various map projections have been developed to balance accuracy against unavoidable distortion, with the Mercator Projection—originally designed for nautical charts—being perhaps the best known.
World maps generally focus on either political features, such as territorial boundaries and human settlement, or physical features, like mountains, soil type, or land use. Geological maps additionally show underlying rock, fault lines, and subsurface structures, while choropleth maps use color hue and intensity to contrast differences between regions, such as demographic or economic statistics. Thematic maps portray a focused subject, covering physical, social, political, cultural, or economic aspects.
Early world maps, from the Iron Age through the Age of Discovery, reflect the philosophical and cultural basis of their time, often differing greatly from modern cartography. Creating accurate world maps was impossible before the European Renaissance because less than half of Earth’s coastlines and only a small fraction of continental interiors were known to any culture. Knowledge accumulated rapidly thereafter, with most coastlines mapped by the mid-1700s and continental interiors by the twentieth century.
Reader's Guide
World maps generally focus on political features (territorial boundaries and human settlement) or physical features (mountains, soil type, land use). Geological maps show surface and subsurface characteristics, while choropleth maps use color to contrast differences between regions, such as demographic or economic statistics. All world maps are based on map projections, which distort geographic features, distances, and directions. The Mercator Projection, originally designed as a nautical chart, is perhaps the best-known projection.
Thematic maps portray focused subjects such as physical, social, political, cultural, or economic aspects. Early world maps cover depictions from the Iron Age to the Age of Discovery, providing information about known places and the philosophical and cultural basis of the map, which often differed from modern cartography. Maps are one means by which scientists distribute ideas and pass them on to future generations.
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Sources
Compiled from Wikipedia and the sources listed below. Text from Wikipedia is available under CC BY-SA 4.0; this entry is adapted from it.
- Wikipedia: World map (CC BY-SA 4.0).
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