Category Archives: Class Notes

The Gravity Model of Migration

The gravity model of migration is a model in urban geography derived from Newton’s law of gravity, and used to predict the degree of interaction between two places. Newton’s law states that: “Any two bodies attract one another with a force that is proportional to … Continue reading

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Thematic Maps and Thematic Mapping Techniques

A thematic map is a type of map specifically designed to “show a particular theme connected with a specific geographic area. Unlike reference maps, which tell us where something is, thematic maps tell us how something is. There are a number of visualization techniques and … Continue reading

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Isopleths and Isopleth Maps

An Isopleths is a line drawn on a map through all points having the same value of some measurable quantity. The following is a list of all the important isopleths encountered in operational meteorology. An isopleth is a line or curve of equal values. Constant Pressure Surface Most analysis and … Continue reading

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Rail Tourism in India and Pakistan (from the site of Salman Rashid)

Railways is among the more enduring legacies of the British Raj in the subcontinent. There is virtually an inexhaustible body of extremely interesting lore and history of the building of this great system of transportation discussed in a few excellent books and … Continue reading

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