Portal:Maps

The Maps and Cartography Portal

In cartography, a map is a representation or abstraction of geographical reality. Maps are used for a wide range of purposes, including navigation, scientific research, governance, and warfare. A common use is route planning, which enables users to find their way to their destination. Specialized maps, called charts, are used for nautical navigation (nautical charts) and aviation (aeronautical charts). Scientists use maps to organize spatial data in fields such as geology, meteorology, seismology and demographics. Governments use maps for administrative functions such as census, electoral districts, property taxation, dispatching police, and coordinating disaster relief. Military and security organizations use maps for mission planning, surveillance, border management, logistics, and intelligence analysis.

One of the earliest preserved maps is from the Akkadian Empire (in modern Iraq) inscribed on a clay tablet and dated to 2300 BCE. By the 5th century BCE, Greeks were drawing maps of their known world, encompassing the Mediterranean Sea and most of Europe, North Africa, and the Middle East. Maps were important tools in the Age of Discovery, when mariners used them to explore new lands. The applications of cartography expanded in the late 17th century with the development of thematic maps, which portrayed specific kinds of data – such as rainfall or population density – rather than focusing on geographic features such as rivers, mountains, and cities. The rapid expansion of road networks and mass transit systems in the 20th century created a market for mass-produced maps aimed at the traveling public.

The development of computer cartography and geographic information systems enabled the storage of vast amounts of geographic data, which could be dynamically displayed and analyzed. Unlike paper maps, interactive maps permit users to interactively zoom, pan, and choose which data to view. Geographic data used for mapmaking includes imagery, scanned paper maps, surveying measurements, geographical features, and terrain (elevation) data.

Designing a map is a complex process involving the selection and arrangement of graphical elements to create a map that is informative, useful, and uncluttered. Because the amount of geographic data available is often more than can be effectively displayed, map designers must apply a generalization process to decide which elements to display and which to omit. The amount of detail is influenced by the map scale, expressed as a ratio between a distance on the map and the corresponding distance on the ground. The choice of a map projection is fundamental, as every projection introduces characteristic distortions. Geographic coordinates may be displayed as latitude and longitude, or in a Cartesian (XY grid) system. In addition to geographic data, maps may include supplemental elements such as legends, scale bars, north arrows, or inset maps. (Full article...)

Cartography (/kɑːrˈtɒɡrəfi/) is the study and practice of making and using maps. Combining science, aesthetics and technique, cartography builds on the premise that reality (or an imagined reality) can be modeled in ways that communicate spatial information effectively. (Full article...)

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In mathematics, the polar coordinate system specifies a given point in a plane by using a distance and an angle as its two coordinates. These are

the point's distance from a reference point called the pole, and
the point's direction from the pole relative to the direction of the polar axis, a ray drawn from the pole.

The distance from the pole is called the radial coordinate, radial distance or simply radius, and the angle is called the angular coordinate, polar angle, or azimuth. The pole is analogous to the origin in a Cartesian coordinate system. (Full article...)

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The following are images from various map-related articles on Wikipedia.

Image 1Scale variation near the equator for the tangent (red) and secant (green) Mercator projections. (from Scale (map))
Image 2Al-Masudi's world map (10th century) (from History of cartography)
Image 3The Tabula Rogeriana, drawn by Muhammad al-Idrisi for Roger II of Sicily in 1154. Note that the north is at the bottom, and so the map appears "upside down" compared to modern cartographic conventions. (from History of cartography)
Image 4"Mapa de los Estados Unidos de Méjico by John Distrunell, the 1847 map used during the negotiations of the Treaty of Guadalupe Hidalgo ending the Mexican–American War. (from History of cartography)
Image 5The Mercator projection with Tissot's indicatrix of deformation. (The distortion increases without limit at higher latitudes) (from Scale (map))
Image 6Charles Joseph Minard's map of Napoleon's Russian campaign of 1812 (1844) has been long recognized as a masterwork of cartographic design at a time when such was difficult and rare. (from Cartographic design)
Image 7The Da Ming Hun Yi Tu map, dating c. 1390, exists in multicolour format. (from History of cartography)
Image 8The Equal Earth projection (2018), an increasingly popular equal-area pseudocylindrical projection for world maps (from Cartographic design)
Image 9A bar scale with the nominal scale expressed as "1:600 000", meaning 1 cm on the map corresponds to 600,000 cm=6 km on the ground. (from Scale (map))
Image 10The first Japanese printed map to depict the world, including Europe and America. Printed by woodblock in 1710, composed by the Buddhist monk Rokashi Hotan. (from History of cartography)
Image 11A survey of Boston Harbor from Atlantic Neptune. (from History of cartography)
Image 12A US civil war hachure paper map made in 1867 by cartographer Nathaniel Michler vs. modern aerial photos over Chancellorsville, Virginia (from History of cartography)
Image 13The Mercator 1569 world map (from History of cartography)
Image 14The pundit (explorer) cartographer Nain Singh Rawat (19th century) received a Royal Geographical Society gold medal in 1876. (from History of cartography)
Image 15Map of the Holy Land, Pietro Vesconte, 1321. Described by Adolf Erik Nordenskiöld as "the first non-Ptolemaic map of a definite country". (from History of cartography)
Image 16The Propaganda Map, a 1529 version of the Padrón Real now held by the Vatican Library. (from History of cartography)
Image 17The equidistant projection with Tissot's indicatrix of deformation (from Scale (map))
Image 18The Winkel tripel projection with Tissot's indicatrix of deformation (from Scale (map))
Image 19Infinitesimal elements on the sphere and a normal cylindrical projection (from Scale (map))
Image 20Modern version of the Roman Tabula Peutingeriana (5th century). (from History of cartography)
Image 21World Map by Juan de la Cosa (1500), the first map showing the Americas. (from History of cartography)
Image 22A well-composed transit map of Istanbul, with a high degree of contrast between the symbols, creating a strong visual hierarchy (transit lines are and look most important), figure-ground, and selectivity (the green national rail line can be isolated when necessary). Also note the harmonizing subdued tones of green and blue in the background. (from Cartographic design)
Image 23The Yu Ji Tu, or Map of the Tracks of Yu Gong, carved into stone in 1137, located in the Stele Forest of Xi'an. This 3 ft (0.91 m) squared map features a graduated scale of 100 li for each rectangular grid. China's coastline and river systems are clearly defined and precisely pinpointed on the map. Yu Gong is in reference to the Chinese deity described in the geographical chapter of the Classic of History, dated 5th century BC. (from History of cartography)
Image 24The world according to Hekatæus, 500 BC (from History of cartography)
Image 25A chart of an unidentified area (from History of cartography)
Image 26A portrait of a Dutch mapmaker looking up intently from his charts and holding a caliper, 1714. (from History of cartography)
Image 27CIA map of Iraq, following typical labeling guidelines to maximize legibility and association (from Cartographic design)
Image 28The Fra Mauro map, a medieval European map, was made around 1450 by the Italian monk Fra Mauro. It is a circular world map drawn on parchment and set in a wooden frame, about two meters in diameter. (from History of cartography)
Image 29Universalis Cosmographia, the Waldseemüller wall map dated 1507, depicts the Americas, Africa, Europe, Asia, and the Pacific Ocean separating Asia from the Americas. (from History of cartography)
Image 30Scale variation for the Lambert (green) and Gall (red) equal area projections. (from Scale (map))
Image 31Clay tablet with map of the Babylonian city of Nippur (c. 1400 BC) (from History of cartography)
Image 32An early Western Han dynasty (202 BC – 9 AD) silk map found in tomb 3 of Mawangdui Han tombs site, depicting the Kingdom of Changsha and Kingdom of Nanyue in southern China (note: the south direction is oriented at the top, north at the bottom). (from History of cartography)
Image 33Possibly the oldest surviving map has been engraved on this mammoth tusk, dated to 25,000 BC, found from Pavlov in the Czech Republic. (from History of cartography)
Image 34Martin Behaim's Erdapfel (1492) is considered to be the oldest surviving terrestrial globe. (from History of cartography)
Image 35A chorochromatic map of world land cover, using hue, value, and saturation to differentiate nominal values (from Cartographic design)
Image 36Nautical chart by Pedro Reinel (c. 1504), one of the first based on astronomical observations and to depict a scale of latitudes. (from History of cartography)
Image 37The cartographic process (from Cartographic design)
Image 38The Salviati Planisphere, a 1526 version of the Padrón Real provided by Charles V to the cardinal who officiated his wedding to Isabella of Portugal. (from History of cartography)
Image 39World map Theatrum Orbis Terrarum by Ortelius (1570) (from History of cartography)
Image 40The world according to Herodotus, 440 BC (from History of cartography)
Image 413D cartography of Washington State, Mount Rainier National Park, Pinnacle Peak trail. (from Cartographic design)
Image 42A map of Sikkim, India using shaded relief and hypsometric tints (a form of isarithm) to visualize terrain (from Cartographic design)
Image 43The Gough Map, a road map of 14th-century Britain (from History of cartography)
Image 44A graphical or bar scale. A map would also usually give its scale numerically ("1:50,000", for instance, means that one cm on the map represents 50,000cm of real space, which is 500 meters) (from Scale (map))
Image 45A general map of the world by Samuel Dunn, 1794, containing star chart, map of the Solar System, map of the Moon and other features along with Earth's both hemispheres. (from History of cartography)
Image 46Surviving fragment of the first World Map of Piri Reis (1513) showing parts of the Americas. (from History of cartography)
Image 47Reconstruction of Pomponius Mela's world map. (from History of cartography)
Image 48Map of the “Inhabited Quarter” by Sadiq Isfahani from Jaunpur c.1647. This was one of the only surviving Indian made maps. (from History of cartography)
Image 49Blaeu's world map, originally prepared by Joan Blaeu for his Atlas Maior, published in the first book of the Atlas Van Loon (1664) (from History of cartography)
Image 50Map of Biscayne National Park, Florida, using a variety of point symbols, along with line and area symbols. Note the use of coordinated fill and stroke symbols for the national park area to solve the challenge of a water boundary. (from Cartographic design)

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Statue of al-Idrisi in Ceuta

Abu Abdullah Muhammad al-Idrisi al-Qurtubi al-Hasani as-Sabti, or simply al-Idrisi /ælɪˈdriːsiː/ (Arabic: أبو عبد الله محمد الإدريسي القرطبي الحسني السبتي; Latin: Dreses; 1100–1165), was an Arab Muslim geographer and cartographer who served in the court of King Roger II at Palermo, Sicily. Muhammad al-Idrisi was born in Ceuta, then belonging to the Almoravid dynasty. He created the Tabula Rogeriana, one of the most advanced medieval world maps. al-Idrisi stands as one of the most celebrated cartographers and geographical scholars from the Islamic world, exemplifying the intellectual figures who preserved and advanced the Arabic culture and traditions during the Era of the Normans in medieval Sicily. (Full article...)

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The Olmec heartland. The yellow dots represent ancient habitation sites, while the red dots represent isolated artifact finds unassociated with any ancient town or village.

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Did you know

... that Kaneza Schaal and Christopher Myers created Cartography after seeing a young boy playing music?
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... that the Canadian League for Peace and Democracy organized a 10,000-person rally at Maple Leaf Gardens in Toronto to protest a 2,500-person fascist rally?