ELEMENTS OF REMOTE SENSING QUIZ

Rayleigh's criteria for a rough surface is: (where letters carry their usual meanings).

h = λ/8 cos θ

h > λ/Δ cos θ

h < λ/8 cos θ

h > λ/8 cos θ

TRUE ANSWER : ?
YOUR ANSWER : ?

If flying height of a spacecraft is H, the length of air base is B and the parallax difference between two points is dp, then the difference in height

h = (B/H) dp

h = dp/(B/H)

h = dp/(H/B)

h = (H/B) dp

TRUE ANSWER : ?
YOUR ANSWER : ?

‘A’ and ‘B’ are two towers of equal height diametrically opposite on either side of the nadir point, at 3 km and 5 km distances. Which one of the following statements is correct?

Height displacement of A and B is equal

Height displacement of A will be less than that of B

Height displacement of B will be less than that of A

Height displacement of A and B will be towards each other

TRUE ANSWER : ?
YOUR ANSWER : ?

Earth observations from a satellite platform provide:

Constant solar zenith angles and similar illumination conditions

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

All of these

Synoptic view of a large area

TRUE ANSWER : ?
YOUR ANSWER : ?

Which one of the following helps to identify the objects on the earth surface?

None of these

Atmospheric window

Radiometric error

Signature

TRUE ANSWER : ?
YOUR ANSWER : ?

The GPS space segment consists of Navigation Satellite Timing and Ranging whose number is :

8

16

12

24

TRUE ANSWER : ?
YOUR ANSWER : ?

Which one of the following statements is correct regarding the GPS satellites?

The inclination of axis satellite is 55°

All of these

The satellite transmits two L band signals (L1 with 1575.42 MHz and L2 with 1276.6 MHz)

The nominal altitude is about 20,200 km

TRUE ANSWER : ?
YOUR ANSWER : ?

The reflection of solar energy is characterized by the water content in the leaf, in the reflective optical infrared:

Visible (0.4 - 0.7 μm) region

Near-IR (0.7 - 1.3 μm) region

Short wave-IR (1.3 - 2.7 μm) region

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

If θ is the angle of scan measured from the nadir, the ground distance swept by the sensor IFOV is proportional to:

sec²θ

sin²θ

tan²θ

cos²θ

TRUE ANSWER : ?
YOUR ANSWER : ?

The part radiation due to scattered/diffused radiation entering the field of view of a remote sensor other than that from the required target,

Reduces the contrast of the image and also its sharpness

Reduces the contrast but increases the sharpness

Increases both the contrast and sharpness

Increases the contrast of the image but reduces the sharpness

TRUE ANSWER : ?
YOUR ANSWER : ?