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Georeferencing and Projections Questions and Answers

1.

On 1 : 50,000 scale survey of India, toposheet, 2 cm corresponds to ........

Exam Year(s)

MH SET - 2023, SET Exam - 2023,

Answer: A

2 cm corresponds to 1 km.

A scale of 1 : 50,000 means 1 cm on the map is 50,000 cm on the ground.

\[ \begin{aligned} 1\ \text{cm} &= 50{,}000\ \text{cm} = 0.5\ \text{km} \\ 2\ \text{cm} &= 2 \times 0.5 = 1\ \text{km} \end{aligned} \]

5 km and 10 km would need scales of 1 : 250,000 and 1 : 500,000, and 20 km would be 1 : 1,000,000.

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2.

In universal polar stereographic coordinate system the eastings and northings are computed using which projection method ?

Exam Year(s)

UGC NET - 2012,

Answer: A

The universal polar stereographic (UPS) system uses the polar aspect stereographic projection to compute eastings and northings in the polar regions, north of 84 degrees N and south of 80 degrees S. It is the polar counterpart of UTM, which covers the rest of the world with transverse Mercator zones. A non-polar aspect stereographic projection would distort the polar regions, and Mercator projections, in either aspect, stretch distances toward the poles. Only the polar aspect stereographic projection is used.

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