Geography (from the Greek words Ge (γη) or Gaea (γαια), both meaning "Earth", and graphein (γραφειν) meaning "to describe" or "to write"or "to map") is the study of the surface of the Earth and the activities of humanity upon it. The 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 earth sciences. 
Historically, the distinction between physical and human geography has been a source of tension within the discipline. Some academic systems recognise a strong division between physical geography and human geography. Other systems seek to position geography as a meeting point for earth sciences and social science, where modern geography is synthesising. Whichever route is followed, the history of geography shows a clear progression from being essentially descriptive in character to essentially analytical.
Historically, geography was closely associated with eras of exploration and, as such, geographers have been seen as synonymous with cartographers and people who study place names: so-called "capes and bays" geography. Most geographers are trained in at least the basics of cartography, but geographers study the spatial and temporal distribution of phenomena, processes and feature as well as the interaction of humans and their environment. By the mid-19th Century those practising geography were making this explicit:
"Mere names of places...are not geography...To know by heart a whole gazetteer full of them would not, in itself, constitute anyone a geographer. Geography has higher aims than this: it seeks to classify phenomena (alike of the natural and of the political world, in so far as it treats of the latter), to compare, to generalize, to ascend from effects to causes, and, in doing so, to trace out the great laws of nature and to mark their influences upon man. This is 'a description of the world'—that is Geography. In a word Geography is a Science—a thing not of mere names but of argument and reason, of cause and effect." William Hughes 1863
Human geography 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. Physical geography examines the natural environment and how the climate, vegetation & life, soil, water and landforms are produced and interact. Environmental geography seeks to combine physical and human geography and looks at the interactions between the environment and humans.
History of geography
- See main article: History of geography
The foundations of geography can be traced to the ancient cultures, such as the Greeks, who were the first to explore geography as both art and science, through Cartography, Philosophy, and Literature, or through Mathematics. Th earliest known debates about the size and shape of the Earth occurred there. Anaxagoras was able to demonstrate that the profile of the Earth was circular by explaining eclipses. although he believed that the Earth was a flat disk. One of the first estimates of the radius of the Earth was made by Eratosthenes.
The first rigorous system of latitude and longitude is credited to Hipparchus, using a sexagesimal system derived from Babylonian mathematics. The parallels and meridians were sub-divided into 360°, with each degree further subdivided 60′ (minutes). To measure longitude, he suggested using eclipses to determine the relative difference in time. Extensive mapping by the Romans 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.
The fall of the Roman empire saw shift in the evolution of geography from Europe to the Islamic world. Scholars such as Idrisi (produced detailed maps), Ibn Batutta, and Ibn Khaldun provided detailed accounts of their Hajj. 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.
The Age of discovery and imperialism during the 16th and 17th centuries, with many new lands discovered, and accounts by explorers such as Christopher Columbus, Marco Polo and James Cook, revived a desire for accurate geographic detail.
The 18th and 19th centuries were the times when geography began to be recognized as a discrete academic discipline and became part of a typical university curriculum in Europe (especially Paris and Berlin). The development of many geographic societies also occurred during the 19th century with the foundations of the Société de Géographie in 1821, the Royal Geographical Society in 1830, Russian Geographical Society in 1845 and the National Geographic Society in1888. The influence of Immanuel Kant, Alexander von Humbolt, Carl Ritter and Paul Vidal de la Blache can be seen as a major turning point in geography from a descriptive to an analytical subject.
In the West during the 20th century, geography went through four major phases: environmental determinism, regional geography, the quantitative revolution, and critical geography, reflecting tensions with the discipline regarding it proper focus and approach. Interdisciplinary links between geography and geology, botany,economics, sociology and demographics mean that geography remains synthetic in nature, but the evolution of the discipline has follow rather different patterns in North America than in Europe.
Advances 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.
Branches of geography
Physical geography focuses on geography as an Earth science. It aims to understand the physical features of the Earth, its lithosphere, hydrosphere, atmosphere, pedosphere and global flora and fauna patterns (biosphere). Physical Geography can be divided into the following broad categories:
- Climatology and paleoclimatology
Human geography focuses on the study of patterns and processes that shape human interaction with various environments. It encompasses, political, cultural, social, and economic aspects. Human geography can be divided into many broad categories, such as:
- Historical geography
- Political geography, including Geopolitics*
- Regional geography
- Social geography
- Strategic geography
- Urban geography
- * – Distinction between these fields a prone to change. The above list should not be considered definitive.
Environmental geography studies 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 specialisation of the two sub-fields. Furthermore, as human relationship with the environment has changed as a result of globalisation and technological change a new approach seeks to understand the changing and dynamic relationship. Examples of areas of research in environmental geography include disaster management, environmental management, sustainability and political ecology.
Geomatics (also known as Geographic Information Science) has emerged since the quantitative revolution in geography in the mid 1950s. Geomatics involves the use of traditional spatial techniques used in cartography and terrain analysis and their application to computers. Geomatics has become a widespread field with many other disciplines using techniques such as GIS and remote sensing. Geomatics has also lead to a revitalisation of some geography departments especially in Northern America where the subject had a declining status during the 1950s.
Regional geography is a branch of geography that studies the regions of all sizes across the Earth. It has a prevailing descriptive character. The main aim is to understand or define the uniqueness or character of a particular region which consists of natural as well as human elements. Attention is paid also to regionalization which covers the proper techniques of space delimitation into regions.
As spatial interrelationships are fundamental to geography, maps are a key tool. Classical cartography has been joined by a more modern approach to geographical analysis, computer-based geographic information systems (GIS).
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 - Simply specifies the locations of features and populations.
- Analytical - Asks why we find features and populations in a specific geographic area.
Techniques used by geographers include, but are not limited to:
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 abstract 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 (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. In addition to all of the other subdisciplines 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 can be defined as the art and 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).
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, 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.
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.
Selective list of 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
- Alexander Von Humboldt (1769–1859) - published the Kosmos and founder of the sub-field biogeography. Founder of modern geography
- Carl Ritter (1779-1859) - Occupied the first chair of geography at Berlin University, founder of modern geography
- 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
- Walter Christaller (1893-1969) - human geographer and inventor of Central Place Theory
- David Harvey (1935-) - Marxist geographer and author on theories on space and urban geography.
- Arnold Henry Guyot (1807-1884) - noted the structure of glaciers and advanced understanding in glacier motion especially fast ice flow
- Nigel Thrift (1949-) - originator of non-representational theory
- Michael Frank Goodchild (1944-) - prominent GIS scholar and winner of the RGS founder's medal in 2003 and the Prix Vautrin Lud (the Nobel Prize of Geography) in 2007
- The American Heritage Dictionary of the English Language, Fourth Edition, Houghton Mifflin Company
- Pattison, W.D. (1990). "The Four Traditions of Geography". Journal of Geography 89 (5): pp. 202-6. Template:ISSN. Reprint of a 1964 article.
- What is Environmental Geography, Anyway?
- Hughes, William. (1863). The Study of Geography. Lecture delivered at King's College, London. Quoted in Baker, J.N.L (1963). The History of Geography. Oxford: Basil Blackwell, p. 66.
- http://www.aag.org/Careers/What_is_geog.html What is geography?
- Jean-Louis and Monique Tassoul (1920). A Concise History of Solar and Stellar Physics. London: Princeton University Press.
- Hipparcos of Rhodes. Technology Museum of Thessaloniki (2001). Retrieved on 2006-10-16.
- Sullivan, Dan (2000). Mapmaking and its History. Rutgers University. Retrieved on 2006-10-16.
- Société de Géographie, Paris, France (French). Retrieved on 2007-01-15.
- About Us. Royal Geographical Society. Retrieved on 2007-01-15.
- 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 planetology. Alternative terms such as areology (the study of Mars) have been proposed but are not widely used.