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Remote sensing > Intro and EM > Flashcards

Intro and EM Flashcards

1
Q

What is remote sensing?

A

It is the science of acquiring information about the earth surface without getting in contact with it.

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2
Q

Energy travels in

A

electromagnetic waves

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3
Q

What are the two properties of every wave?

A

Wavelength and frequency

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4
Q

The distance between two successive crests is

A

wavelength

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5
Q

The number of cycle of wave passing a fixed point per unit of time is

A

frequency

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6
Q

The longer the wavelength the lower/higher the frequency?

A

lower

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7
Q

The electro magnetic spectrum ranges from Gamma to ….

A

microwave

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8
Q

What is the shortest wave length?

A

Ultra violet

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9
Q

The primary colors from which other colors on the visible light portion of the electromagnetic spectrum can be obtained are…?

A

Blue, green and red

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10
Q

Which wave on the spectrum has the longest wavelength and the shortest frequency?

A

Radio waves

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11
Q

I am shorter than radio waves but I have a higher frequency than that bitch, 🙄 who am i?

A

Microwaves

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12
Q

The wave that is applied in RIS for thermal imaging and communication is called?

A

Infrared

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13
Q

The type of wave applied in germicidal lamps, black light and UV spectroscopy is called?

A

Ultraviolet waves

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14
Q

Shortest in the spectrum with the highest frequency is

A

Gamma rays

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15
Q

Applied in medical imaging, security scanning and materials testing is

A

X-rays

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16
Q

What is spectral resolution?

A

ability of the sensor to separate EM into small intervals (bands)

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17
Q

Three main types of sensors used are

A

Optical, Radar and LiDAR

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18
Q

With the passive type of remote sensing, what is the source of energy?

A

The sun, earth or atmosphere

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19
Q

Source of energy in active remote sensing is

A

remote sensor system

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20
Q

The angle between the sun and a line perpendicular to a surface is called

A

solar incidence angle

21
Q

The solar incidence angle for a horizontal surface is called

A

Solar zenith angle

22
Q

The finer the spectral resolution the ….., the wavelength range for a particular channel or band

A

narrower

23
Q

The length of time for a satellite to complete one entire orbit circle is called

A

Temporal resolution

24
Q

The two basic theories that describe EMR are

A

the wave and particle theory

25
Q

EM energy is composed of discrete units called

A

photons or quanta

26
Q

The theory that is most useful in quantifying the amount of energy measured by the sensors is

A

Particle theory

27
Q

The wavelengths at which the radiation can penetrate the atmosphere with the little interference are called

A

Atmospheric windows

28
Q

Recording devices that measure emitted radiation or sound is

A

Sensor

29
Q

The type of sensor that provides its own energy source for illumination is called an/a

A

Active sensor

30
Q

What are the three forms of interactions between radiation and the target?

A

reflection, absorption and transmission

31
Q

The unpredictable diffusion of radiation by particles in the atmosphere is called

A

Scattering

32
Q

What type of scattering is responsible for the blue and red skies?

A

Rayleigh

33
Q

……..results in the effective loss of energy to atmospheric constituents.

A

absorption

34
Q

Where the angle of reflection equals the angle of incidence is

A

Specular

35
Q

Where reflectance is equal in all direction is

A

diffuse

36
Q

The ratio of reflected energy to incident energy as a function of wavelength is called

A

spectral reflectance

37
Q

The light energy per unit time impinging on a surface, normalized by the surface area is called

A

irradiance

38
Q

……is simply how much light the instrument sees from the object being observed.

A

radiance

39
Q

When radiation is redirected from its original path, we call it

A

scattering

40
Q

When ozone, CO2 and water vapor absorbs radiation, we call it

A

absorption

41
Q

The two main interactions in the atmosphere are

A

scattering and absorption

42
Q

Smooth surface bouncing radiation in one direction is

A

specular

43
Q

rough surface bouncing energy in all directions is

A

diffuse

44
Q

Leaves in summer have more chlorophyll hence they absorb …… wavelength reflecting green.

A

Red and blue

45
Q

In Autumn, chlorophyll is reduced hence it exhibits …..

A

yellow to red color

46
Q

Out of the five human body sensors, how many can be considered as a form of remote sensing?

A

3

47
Q

The EM spectrum is divided into narrow wavelength intervals called

A

band or channel

48
Q

Energy detected are stored in

A

bands

49
Q

Bands are numbered from?

A

1

Remote sensing (6 decks)

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