Geography



Geography (from Greek γεωγραφία - geographia, lit. "earth describe-write") is the study of the Earth and its lands, features, inhabitants, and phenomena. A literal translation would be "to describe or write about the Earth". The first person to use the word "geography" was Eratosthenes (276-194 B.C.E.). Four historical traditions in geographical research are the spatial analysis of natural and human phenomena (geography as a study of distribution), area studies (places and regions), study of man-land relationship, and research in sciences. Nonetheless, modern geography is an all-encompassing discipline that foremost seeks to understand the Earth and all of its human and natural complexities—not merely where objects are, but how they have changed and come to be. As "the bridge between the human and physical sciences," geography is divided into two main branches—human geography and physical geography.

Introduction
Traditionally, geographers have been viewed the same way as cartographers and people who study place names and numbers. Although many geographers are trained in toponymy (the study of place names) and cartography, these are not their main preoccupations. Geographers study the spatial and temporal distribution of phenomena, processes and features as well as the interaction of humans and their environment. As space and place affect a variety of topics such as economics, health, climate, plants and animals, geography is highly interdisciplinary.

Geography as a discipline can be split broadly into two main sub-disciplines: human geography and physical geography. The former focuses largely on the built environment and how space is created, viewed and managed by humans as well as the influence humans have on the space they occupy. The latter examines the natural environment and how the climate, vegetation, soils, water, and landforms are produced and interact. As a result of the two subfields using different approaches, a third field has emerged: environmental geography. Environmental geography combines physical and human geography and looks at the interactions between humans and the environment.

Physical geography
Physical geography (or physiogeography) focuses on geography as a science. It aims to understand the physical lithosphere, hydrosphere, atmosphere, pedosphere, and global flora and fauna patterns (biosphere). Physical geography can be divided into the following broad categories:


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 * Biogeography || Climatology & paleoclimatology || Coastal geography || Environmental geography & management








 * Geodesy || Geomorphology || Glaciology || Hydrology & Hydrography






 * Landscape ecology || Oceanography || Pedology (soil study) || Palaeogeography


 * }
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Human geography
Human geography is a branch of geography that focuses on the study of patterns and processes that shape human interaction with various environments. It encompasses human, political, cultural, social, and economic aspects. While the major focus of human geography is not the physical landscape of the Earth (see physical geography), it is hardly possible to discuss human geography without referring to the physical landscape on which human activities are being played out, and environmental geography is emerging as a link between the two. Human geography can be divided into many broad categories, such as:


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 * Cultural geography || Development geography || Economic geography || Health geography








 * Historical & Time geog. || Political geog. & Geopolitics || Pop. geog. or Demography || Religion geography








 * Social geography || Transportation geography || Tourism geography || Urban geography


 * }

Various approaches to the study of human geography have also arisen through time and include:
 * Behavioral geography
 * Feminist geography
 * Culture theory
 * Geosophy

Environmental geography
Environmental geography is the branch of geography that describes the spatial aspects of interactions between humans and the natural world. It requires an understanding of the traditional aspects of physical and human geography, as well as the ways in which human societies conceptualize the environment.

Environmental geography has emerged as a bridge between human and physical geography as a result of the increasing specialization of the two sub-fields. Additionally, as the human relationship with the environment has changed as a result of globalization and technological advance, a new approach was needed to understand this dynamic relationship. Areas of research in environmental geography include emergency management, environmental management, sustainability, and political ecology.

Regional geography
Regional geography is a branch of geography that studies regions of all sizes across the Earth. Its primary aims are to understand, describe, and define the uniqueness or character of a particular region, which consists of both natural and human elements. Attention is paid also to regionalization, which covers the proper techniques of space delimitation into regions.

Regional geography is also considered as a certain approach to study in geographical sciences (similar to quantitative or critical geographies, for more information see History of geography).

Biogeography
Biogeography is the study of historic and present geographic distributions of plants and animals throughout the world. Biogeographers study changes in ecosystems and how they affect certain species. There are two main branches in biogeography: phytogeography, which studies the distribution of plants, and zoogeography which studies the distribution of animals.

Related fields

 * Urban planning, regional planning and spatial planning: use the science of geography to assist in determining how to develop (or not develop) the land to meet particular criteria, such as safety, beauty, economic opportunities, the preservation of the built or natural heritage, and so on. The planning of towns, cities, and rural areas may be seen as applied geography.
 * Regional science: In the 1950s the regional science movement led by Walter Isard arose, to provide a more quantitative and analytical base to geographical questions, in contrast to the descriptive tendencies of traditional geography programs. Regional science comprises the body of knowledge in which the spatial dimension plays a fundamental role, such as regional economics, resource management, location theory, urban and regional planning, transport and communication, human geography, population distribution, landscape ecology, and environmental quality.
 * Interplanetary Sciences: While the discipline of geography is normally concerned with the Earth, the term can also be informally used to describe the study of other worlds, such as the planets of the Solar System and even beyond. The study of systems larger than the earth itself usually forms part of Astronomy or Cosmology. The study of other planets is usually called planetary science or planetology. Alternative terms such as Areology (the study of Mars) have been proposed, but are not widely used.

Geographical techniques
In their study, geographers use four interrelated approaches:
 * Systematic - Groups geographical knowledge into categories that can be explored globally.
 * Regional - Examines systematic relationships between categories for a specific region or location on the planet.
 * Descriptive - Specifies the locations of features and populations.
 * Analytical - Asks why we find features and populations in a specific geographic area.

Each of these approaches requires the collection, management, visualization, analysis, and communication of large amounts of georeferenced information. The use of data-intensive, analytical techniques to study Geography first emerged as the "quantitative revolution" in geography in the mid 1950s. Various techniques and technologies have thus arisen for handling geographic information, including maps and Cartography, Geographic information systems (GIS), Remote sensing, Surveying, Spatial statistics and Geostatistics, and Global positioning systems (GPS).

These fields are closely related, and could be considered a single sub-discipline of Geography or a discipline in its own right, but the community has had some difficulty agreeing on a name for itself. In the United States, the term Geographic Information Science or GIScience has been used by some segments of the academic community since the 1990s, while others prefer Geospatial Science. Practitioners and the industry in the United States generally refers to itself as Geospatial Technology. In Canada and Europe, the terms Geomatics and Geoinformatics have gained wide acceptance.

Cartography
Cartography studies the representation of the Earth's surface with abstract symbols (map making). Although other subdisciplines of geography rely on maps for presenting their analyses, the actual making of maps is unique enough to be regarded separately. Cartography has grown from a collection of drafting techniques into an actual science.

Cartographers must learn cognitive psychology and ergonomics to understand which symbols convey information about the Earth most effectively, and behavioral psychology to induce the readers of their maps to act on the information. They must learn geodesy and fairly advanced mathematics to understand how the shape of the Earth affects the distortion of map symbols projected onto a flat surface for viewing. It can be said, without much controversy, that cartography is the seed from which the larger field of geography grew. Most geographers will cite a childhood fascination with maps as an early sign they would end up in the field.

Geographic information systems
Geographic information systems (GIS) deal with the storage of information about the Earth for automatic retrieval by a computer, in an accurate manner appropriate to the information's purpose. A GIS specialist or technician uses software to combine spatial layers containing data to solve problems. When data layers are "placed" on top of one another, analyses can be performed to see how the layers interact with each other. GIS analyses of this nature can be used in all types of settings: human geography, physical geography, etc.

In addition to all of the other sub-disciplines of geography, GIS specialists must understand computer science and database systems. GIS has revolutionized the field of cartography; nearly all mapmaking is now done with the assistance of some form of GIS software. GIS also refers to the science of using GIS software and GIS techniques to represent, analyze and predict spatial relationships. In this context, GIS stands for Geographic Information Science.

Remote sensing
Remote sensing is the science of obtaining information about Earth features from measurements made at a distance. Remotely sensed data comes in many forms such as satellite imagery, aerial photography and data obtained from hand-held sensors. Geographers increasingly use remotely sensed data to obtain information about the Earth's land surface, ocean and atmosphere because it: a) supplies objective information at a variety of spatial scales (local to global), b) provides a synoptic view of the area of interest, c) allows access to distant and/or inaccessible sites, d) provides spectral information outside the visible portion of the electromagnetic spectrum, and e) facilitates studies of how features/areas change over time. Remotely sensed data may be analyzed either independently of, or in conjunction with, other digital data layers (e.g., in a Geographic Information System).

Geographic quantitative methods
Geostatistics deal with quantitative data analysis, specifically the application of statistical methodology to the exploration of geographic phenomena. Geostatistics is used extensively in a variety of fields including: hydrology, geology, petroleum exploration, weather analysis, urban planning, logistics, and epidemiology. The mathematical basis for geostatistics derives from cluster analysis, linear discriminant analysis and non-parametric statistical tests, and a variety of other subjects. Applications of geostatistics rely heavily on geographic information systems, particularly for the interpolation (estimate) of unmeasured points. Geographers are making notable contributions to the method of quantitative techniques.

Geographic qualitative methods
Geographic qualitative methods, or ethnographical research techniques, are used by human geographers. In cultural geography there is a tradition of employing qualitative research techniques also used in anthropology and sociology. Participant observation and in-depth interviews provide human geographers with qualitative data.

History of geography
The ideas of Anaximander (c. 610 B.C.-c. 545 B.C.), considered by later Greek writers to be the true founder of geography, come to us through fragments quoted by his successors. Anaximander is credited with the invention of the gnomon,the simple yet efficient Greek instrument that allowed the early measurement of latitude. The foundations of geography can be traced to the ancient cultures, such as the ancient, medieval, and early modern Chinese. The Greeks, who were the first to explore geography as both art and science, achieved this through Cartography, Philosophy, and Literature, or through Mathematics. There is some debate about who was the first person to assert that the Earth is spherical in shape, with the credit going either to Parmenides or Pythagoras. Anaxagoras was able to demonstrate that the profile of the Earth was circular by explaining eclipses. However, he still believed that the Earth was a flat disk, as did many of his contemporaries. One of the first estimates of the radius of the Earth was made by Eratosthenes.

The first rigorous system of latitude and longitude lines is credited to Hipparchus. He employed a sexagesimal system that was derived from Babylonian mathematics. The parallels and meridians were sub-divided into 360°, with each degree further subdivided 60′ (minutes). To measure the longitude at different location on Earth, he suggested using eclipses to determine the relative difference in time. The extensive mapping by the Romans as they explored new lands would later provide a high level of information for Ptolemy to construct detailed atlases. He extended the work of Hipparchus, using a grid system on his maps and adopting a length of 56.5 miles for a degree.

From the 3rd century onwards, Chinese methods of geographical study and writing of geographical literature became much more complex than what was found in Europe at the time (until the 13th century). Chinese geographers such as Liu An, Pei Xiu, Jia Dan, Shen Kuo, Fan Chengda, Zhou Daguan, and Xu Xiake wrote important treatises, yet by the 17th century, advanced ideas and methods of Western-style geography were adopted in China.

During the Middle Ages, the fall of the Roman empire led to a shift in the evolution of geography from Europe to the Islamic world. Muslim geographers such as Muhammad al-Idrisi produced detailed world maps (such as Tabula Rogeriana), while other geographers such as Yaqut al-Hamawi, Abu Rayhan Biruni, Ibn Battuta and Ibn Khaldun provided detailed accounts of their journeys and the geography of the regions they visited. Turkish geographer, Mahmud al-Kashgari drew a world map on a linguistic basis, and later so did Piri Reis (Piri Reis map). Further, Islamic scholars translated and interpreted the earlier works of the Romans and Greeks and established the House of Wisdom in Baghdad for this purpose. Abū Zayd al-Balkhī, originally from Balkh, founded the "Balkhī school" of terrestrial mapping in Baghdad. Suhrĝb, a late tenth century Muslim geographer, accompanied a book of geographical coordinates with instructions for making a rectangular world map, with equirectangular projection or cylindrical equidistant projection. In the early 11th century, Avicenna hypothesized on the geological causes of mountains in The Book of Healing (1027).

Abu Rayhan Biruni (976-1048) first described a polar equi-azimuthal equidistant projection of the celestial sphere. He was regarded as the most skilled when it came to mapping cities and measuring the distances between them, which he did for many cities in the Middle East and Indian subcontinent. He often combined astronomical readings and mathematical equations, in order to develop methods of pin-pointing locations by recording degrees of latitude and longitude. He also developed similar techniques when it came to measuring the heights of mountains, depths of valleys, and expanse of the horizon. He also discussed human geography and the planetary habitability of the Earth. He hypothesized that roughly a quarter of the Earth's surface is habitable by humans. He also calculated the latitude of Kath, Khwarezm, using the maximum altitude of the Sun, and solved a complex geodesic equation in order to accurately compute the Earth's circumference, which were close to modern values of the Earth's circumference. His estimate of 6,339.9 km for the Earth radius was only 16.8 km less than the modern value of 6,356.7 km. In contrast to his predecessors who measured the Earth's circumference by sighting the Sun simultaneously from two different locations, al-Biruni developed a new method of using trigonometric calculations based on the angle between a plain and mountain top which yielded more accurate measurements of the Earth's circumference and made it possible for it to be measured by a single person from a single location. He also published a study of map projections, Cartography, which included a method for projecting a hemisphere on a plane.



During the European Age of Discovery of the 16th and 17th centuries, many new lands were discovered by European explorers such as Christopher Columbus, Marco Polo and James Cook. There was a revived desire for increasingly accurate geographic detail and solid theoretical foundations in Europe.

The 18th and 19th centuries were the times when geography became recognized as a discrete academic discipline and became part of a typical university curriculum in Europe (especially Paris and Berlin). Many geographic societies were formed during the 19th century, such as the Société de Géographie in 1821, the Royal Geographical Society in 1830, the Russian Geographical Society in 1845, the American Geographical Society in 1851, and the National Geographic Society in 1888. The influence of Immanuel Kant, Alexander von Humboldt, Carl Ritter and Paul Vidal de la Blache can be seen as a major turning point in geography from a philosophy to an academic subject.

Over the past two centuries the advancements in technology such as computers, have led to the development of geomatics and new practices such as participant observation and geostatistics being incorporated into geography's portfolio of tools. In the West during the 20th century, the discipline of geography went through four major phases: environmental determinism, regional geography, the quantitative revolution, and critical geography. The strong interdisciplinary links between geography and the sciences of geology and botany, as well as economics, sociology and demographics have also grown greatly especially as a result of Earth System Science that seeks to understand the world in a holistic view.

Notable geographers

 * Eratosthenes (276BC - 194BC) - calculated the size of the Earth.
 * Ptolemy (c.90–c.168) - compiled Greek and Roman knowledge into the book Geographia.
 * Gerardus Mercator (1512-1594) - innovative cartographer produced the mercator projection
 * Alexander von Humboldt (1769–1859) - Considered Father of modern geography, published the Kosmos and founder of the sub-field biogeography.
 * Carl Ritter (1779-1859) - Considered Father of modern geography. Occupied the first chair of geography at Berlin University.
 * Arnold Henry Guyot (1807-1884) - noted the structure of glaciers and advanced understanding in glacier motion, especially in fast ice flow.
 * William Morris Davis (1850-1934) - father of American geography and developer of the cycle of erosion.
 * Paul Vidal de la Blache (1845-1918) - founder of the French school of geopolitics and wrote the principles of human geography.
 * Sir Halford John Mackinder (1861-1947) - Co-founder of the LSE, Geographical Association
 * Walter Christaller (1893-1969) - human geographer and inventor of Central place theory.
 * Yi-Fu Tuan (1930-) - Chinese-American scholar credited with starting Humanistic Geography as a discipline.
 * David Harvey (1935-) - Marxist geographer and author of theories on spatial and urban geography, winner of the Vautrin Lud Prize.
 * Edward Soja (born 1941) - Noted for his work on regional development, planning and governance along with coining the terms Synekism and Postmetropolis.
 * Michael Frank Goodchild (1944-) - prominent GIS scholar and winner of the RGS founder's medal in 2003.
 * Doreen Massey (1944-) - Key scholar in the space and places of globalization and its pluralities, winner of the Vautrin Lud Prize.
 * Nigel Thrift (1949-) - originator of non-representational theory.

Famous Geography Students

 * Prince William - studied at St. Andrews University.
 * Michael Jordan - studied at University of North Carolina.

Geographical institutions and societies

 * Anton Melik Geographical Institute (Slovenia)
 * National Geographic Society (U.S.)
 * National Geographic Bee (U.S.)
 * Royal Canadian Geographical Society (Canada)
 * Royal Geographical Society (UK)

Publications

 * African Geographical Review
 * Geographical Review