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B4U4M1 > Remote Sensing & R.S. Products > Flashcards

Remote Sensing & R.S. Products Flashcards

1
Q

What are the 4 components of Incident Radiation?

A

1) Transmission
2) Emission
3) Absorption
4) Reflection

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2
Q

What are the 3 remote sensing ranges?

A

1) Visible Light & Reflective IR
2) Emitted & Thermal IR
3) Microwave

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3
Q

What are the 7 steps of the remote sensing process?

A

1) Source of radiation (Sun)
2) Incident radiation
3) Target
4) Reflection
5) Sensor
6) Processing
7) Product

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4
Q

What are the 3 sources of energy?

A

1) Sunlight
2) Objects
3) Sensors

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5
Q

What is the difference between a passive and an active sensor?

A

A passive sensor uses existing (ambient) energy; an active sensor generates its own energy

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6
Q

The total area that can be captured by a sensor is its…

A

Field of Regard (FOR)

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7
Q

The area perceivable by the sensor at a particular time instant is its…

A

Field of View (FOV)

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8
Q

The area actually imaged by the sensor is its…

A

Sensor swath

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9
Q

What are the 4 types of sensor resolution?

A

1) Spatial
2) Spectral
3) Temporal
4) Radiometric

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10
Q

The definition of spatial resolution:

A

The finest detail distinguishable in an image, measured in meters, i.e. how many meters are depicted per pixel (1m resolution much better than 30m).

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11
Q

Spatial resolution is aka…

A

Instantaneous FOV

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12
Q

The definition of radiometric resolution:

A

The ability to detect differences in energy magnitude. Measured in bits (more bits=more levels of brightness detected=better resolution).

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13
Q

The definition of spectral resolution:

A

Differentiation between distinct wavelengths of received EM radiation

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14
Q

The definition of temporal resolution:

A

The frequency at which data are captured for a specific place, i.e. how often images are taken.

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15
Q

The definition of revisit rate:

A

The time between imaging opportunities for a given point on the Earth’s surface, i.e. how long until a satellite flies over the same spot again.

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16
Q

What type of resolution information involves dimensional characteristics (location, size, shape, number, motion, surface structure)?

A

Spatial info

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17
Q

What type of resolution information involves the total amount of radiant energy (emissivity, reflectivity, type material, chemical composition)?

A

Radiometric (intensity) info

18
Q

What type of resolution information involves radiation as a function of wavelength (temperature, resonance, type material)?

A

Spectral info

19
Q

What type of resolution information involves time-changing characteristics (sensor geographical/orbital characteristics/capabilities)?

A

Temporal info

20
Q

What are the 4 bands of IR, in order of increasing wavelength?

A

1) NIR
2) SWIR
3) MWIR
4) LWIR

21
Q

What are the remote sensing EMR bands, in order of increasing wavelength (decreasing freq)?

A

Visible
NIR
SWIR
MWIR
LWIR
Microwaves: EHF, SHF, UHF

22
Q

Which band(s) can analyze crops & vegetation and detect camoflage?

A

NIR & SWIR

23
Q

Which band(s) can measure thermal radiation?

A

MWIR & LWIR

24
Q

Shortwave/high freq=
_____ detail; _____ penetration

A

More; less

25
Q

Longwave/low freq =
_____ detail; _____ penetration

A

Less; more

26
Q

Which microwave band offers high spatial resolution and provides imagery day or night?

A

EHF

27
Q

Which microwave band can penetrate heavy weather, smoke, fog with good (but not great) spatial resolution?

A

SHF

28
Q

Which microwave band offers very good penetration (tree canopy, sea water) but has low spatial resolution?

A

UHF

29
Q

Which orbit is used for optical sensing?

A

Sun-synchronous (LEO)

30
Q

What are the 3 remote sensing imagery classifications?

A

1) Panchromatic (grayscale) - good spatial rez
2) Multispectral Imaging (MSI) - lower spatial rez
3) Hyperspectral - low spatial rez

31
Q

What colors (bands) does panchromatic imaging collect?

A

Blue, gree & red (displays in grayscale)

32
Q

What band(s) does MSI capture?

A

Light (including IR) from a narrow range of wavelength across the EM spectrum.

33
Q

How does hyperspectral collect light?

A

Hundreds of very narrow bands across the visible & IR spectrum.

34
Q

Hyperspectral provides _____ discrimination but _____ spatial rez.

A

High; low

35
Q

Which type of imagery can distiguish between many kinds of vegetation?

A

Hyperspectral (Hyperion)

36
Q

Spatial rez (size & shape) and spectral rez (composition) are _____ proportional.

A

Inversely

37
Q

Using gases to determine composition is a function of…

A

Spectroscopy

38
Q

Which remote sensing application can determine how much water is in dirt (mud!)?

A

Hydrology

39
Q

Which remote sensing app uses temporal rez?

A

Change detection (red has fled, blue is new)

40
Q

Which remote sensing app can map the sea floor (trenches, reefs, depth)?

A

Bathymetry

41
Q

Which is the only remote sensing band that cannot be used both day and night?

A

Visible light

42
Q

To get a combo of spatial & spectral rez requires what technique?

A

Image fusion

B4U4M1 (1 decks)

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