Category Archives: Geography Practicals/Lab and Statistical Techniques

HYTHERGRAPH

  Introduced by Griffith Taylor to show the relationship between temperature and rainfall.  Monthly temperature is plotted on Y-axis and rainfall along X- axis . The 12 points, each for a month, are marked on the graph and a 12-sided … Continue reading

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Differential Levelling

Differential leveling is a technique used to determine differences in elevation between points that are remote from each other. Differential leveling requires the use of a surveyor’s level together with graduated measuring rods. An elevation is a vertical distance above … Continue reading

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Compass Surveying: An Overview

Compass surveying is the branch of surveying in which the position of an object is located using angular measurements determined by a compass and linear measurements using a chain or tape. Compass surveying is used in following circumstances: If the … Continue reading

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History of Aerial Photography

The first real Aerial photograph was taken around 1826. The first aerial photograph was taken in 1858 by Felix Tournachon, known as Nadar, from a tethered balloon over the Bievre Valley in France. Those photographs no longer exist. The oldest surviving aerial … Continue reading

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