ELEMENTS OF REMOTE SENSING QUIZ

DGPS is based on the concept that bias errors in the position of locations in a given local area, are same if their distances are within

100 km

25 km

50 km

75 km

TRUE ANSWER : ?
YOUR ANSWER : ?

The normal altitude of GPS satellite is about

20,200 km

16,200 km

36,100 km

24,400 km

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Consider the following statements regarding the satellite imaging: 1. The satellite orbit is fixed in the inertial space 2. During successive across-track imaging, the earth rotates beneath the sensor 3. The satellite images a skewed areaWhich one of the following statements is/are correct?

1, 2

1, 2, 3

2, 3

1, 3

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Earth observations from a satellite platform provide:

Repetitive observations of the same area with intervals of a few minutes to a few weeks

Constant solar zenith angles and similar illumination conditions

Synoptic view of a large area

All of these

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YOUR ANSWER : ?

Leaf reflectance depends primarily on:

Equivalent water content

Internal cell structure

The pigments

All of these

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YOUR ANSWER : ?

While propagating through homogeneous, isotropic media,

Directions of both the fields are orthogonal

Both (A) and (B)

Both the fields are at right angles to the direction of propagation

Neither (A) nor (B)

TRUE ANSWER : ?
YOUR ANSWER : ?

A passive sensor uses:

Flash light as a source of energy

None of these

Sun as the source of energy

Its own source of energy

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Repetitive observations of the same area at equal interval of time are useful to monitor the dynamic phenomena:

All of these

Cloud evolution

Snow cover

Vegetative cover

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Which one of the following errors is produced by platform characteristics of the sensor?

Altitude variation

All of these

Orbit drift

Altitude

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According to the Snell's law if an electromagnetic wave is incident in a medium (refractive index n₁) on another medium (refractive index m₂);

The angle of incidence is equal to the angle of refraction

Neither (A) nor (B)

Both (A) and (B)

The angle of refraction (θr) is given by sin θ₂ = (n₁/n₂) sin θi

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