Geography

Geography is the scientific study of the locational and spatial variation of both physical, biological and human phenomena on Earth. The word derives from the Greek words γη or γεια ("Earth") and γραφειν ("to describe" and "to write,").

Geographic techniques

As spatial interrelationships are key to this synoptic science, maps are a key tool. Classical cartography has been joined by a more modern approach to geographical analysis, computer-based geographic information systems (GIS).

Related Topics:
Synoptic science - Map - Cartography - Geographic information systems

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• 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.

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• Geographic Information Systems deals 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 so revolutionized the field of cartography that nearly all mapmaking is now done with the assistance of some form of GIS software.
• Geographic quantitative methods deal with numerical methods peculiar to (or at least most commonly found in) geography. In addition to spatial analyses, you are likely to find things like cluster analysis, discriminant analysis, and non-parametric statistical tests in geographic studies.

In their study geographers use four interrelated approaches:

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• 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.