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Category Archives: Geography Practicals/Lab and Statistical Techniques
Celestial sphere
In astronomy and navigation, the celestial sphere is an imaginary rotating sphere of “gigantic radius”, concentric and coaxial with the Earth. All objects in the sky can be thought of as lying upon the sphere. Projected from their corresponding geographic … Continue reading
Mercator’s Projection
The Mercator projection was invented by Gerardus Mercator, a Flemish mapmaker. His name is a latinized version of Gerhard Kramer. This is his famous world map of 1569. A modern Mercator projection map The property of the Mercator projection map … Continue reading
Pie Chart
A pie chart is a circular chart divided into sectors, illustrating relative magnitudes or frequencies or percents. In a pie chart, the arc length of each sector (and consequently its central angle and area), is proportional to the quantity it … Continue reading
Datum, Ellipsoid, Rhumb Line, Secant, Spheroid, Tangent and other useful terms in Map Projection
Datum—A reference for position on the surface of the Earth. In surveying, a datum is a reference system for computing or correlating the results of surveys. There are two principal types of datums: vertical and horizontal. A vertical datum is … Continue reading
Rashid's Blog: A Place for Inquisitive Souls 