Category Archives: Class Notes

Tourism in Garhwal Himalayas: An Introduction

The ancient history of Garhwal says that it had once been a part of the Mauryan Empire.The history of Garhwal began as a unified whole in the 15th century, when king Ajai Pal merged the 52 principalities of the Garhwal … Continue reading

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Various Uses of Sextant and How it Works

Even today big ships are all required to carry working sextants and the navigating officers have regular routines to keep themselves familiar with making it work. Despite all the Global Positioning Satellites, gyro compasses and radio communications it is at … Continue reading

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History of Sextant

How do navigators use the stars, including our sun, the moon, and planets to find their way? Well, for at least two millennia, navigators have known how to determine their latitude — their position north or south of the equator. … Continue reading

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Concept and Applications of Digital Elevation Model (DEM)

A digital elevation model (DEM) is a digital model or 3D representation of a terrain’s surface — commonly for a planet (including Earth), moon, or asteroid — created from terrain elevation data. In most cases the term digital surface model represents the earth’s surface and includes … Continue reading

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