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Remote Sensing > Exam 1 > Flashcards

Exam 1 Flashcards

1
Q

What is remote sensing?

A

=> Obtain information
=> About Earth’s resources
=> From a distance
=> Using electromagnetic energy

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2
Q

When was the first aerial image taken?

A

1858, Boston (using a balloon)

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3
Q

Launch of Landsat 1?

A

July 23, 1972

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4
Q

Describe Earth’s landscape.

A

=> Geographically variable

=> Time dynamic

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5
Q

What is em energy?

A

Energy that moves with the constant velocity of light in a harmonic wave pattern

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6
Q

Describe electromagnetic spectrum.

A

=> No sharp divisions

=> Classification of em energy according to wavelength (based on what they can do for us)

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7
Q

List colors (wavelengths) of electromagnetic spectrum.

A

ROY.G.BIV (Longer Shorter)

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8
Q

Additive colors?

A

Blue, Green, Red

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9
Q

Subtractive colors?

A

Yellow, Magenta, Cyan

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10
Q

What dyes are present to see black? Wavelengths?

A

Dyes: Y, M, C
Wavelengths: None

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11
Q

What is frequency, wavelength, amplitude?

A 
Frequency = Speed
Wavelength = Used to describe energy
Amplitude = Height
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12
Q

What is atmospheric scattering?

A

=> Redirection of EM energy by suspended atmospheric particles

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13
Q

Raleigh Scatter

A

Elastic scattering of light or other EM radiation by particles much smaller than the wavelength of the radiation. **Increases as wavelength decreases

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14
Q

Most common atmospheric constituents?

A

Nitrogen - 78%
Oxygen - 21%
Argon - 3%

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15
Q

Define spectral signatures.

A

=> An objects unique distribution of reflected, emitted, and transmission of EM energy

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16
Q

What wavelengths and frequencies are considered most harmful to humans?

A

Short and fast

17
Q

If image is 1,000 by 1,000 and fit to frame?

A

Meta data tells width and height (7,000 x 7,000). Looking at 1/49

18
Q

Define analog remote sensing.

A

=> Obtain info
=> Earth
=> Distance
=> B, G, R, NIR (0.4 - 0.9 um)

19
Q

List process of analog remote sensing.

A
  1. Sun
  2. Scattering
  3. Reflectance
  4. Airplane
  5. Photo
  6. Map
20
Q

7 P’s of A.P.I.

A 
Pattern
Shadow
Shape
Size
Site
Tone
Texture
21
Q

Why do federal agencies prefer color-infrared?

A

Visible and NIR give sharper, clearer and more info

22
Q

Film types?

A

=> Black and White (All visible light (B, G, R))
=> Black and White-infrared (G, R, NIR)
=> Color (0.4 - 0.7 um)
=> Color-infrared (G, R, NIR)

23
Q

CIR and red shift?

A

Healthy veg. is seen as bright red, old veg. has lengthy shadows, and less healthy veg. is more magenta

24
Q

List the process of digital remote sensing.

A
  1. Sun
  2. Scattering
  3. Reflectance off earth’s surface
  4. Satellite
  5. Digital image
  6. Map
25
Q

Define digital remote sensing.

A

=> Obtain info
=> About Earth
=> From a distance
=> using visible, near, mid and far infrared

26
Q

What is a digital image?

A

=> Grid of #s used to control the brightness of each pixel (DNs) in the grid.

27
Q

Values of DNs?

A

Real: B, G, R; DEM = DI
Category: Land cover/use = Map

28
Q

What does SEA stand for?

A

Slope, Elevation, Aspect

29
Q

How many bits are there in a byte?

A

1 Byte = 8 bits

30
Q

30x30 m or 5x5 m, which is better?

A

5x5 m is 36 times better

31
Q

Spatial, Spectral, Radiometric, and Temporal? (Image resolution)

A

Spatial: Size of pixel
Spectral: Width of spectrum
Radiometric: Level of detail
Temporal: Time between images

32
Q

Which display would be best suited for on screen digitizing to update road features for a GIS?

A

Color Infrared

33
Q

Which individual band would be best for identifying structural differences within the highly vegetated area?

A

Red

34
Q

What does Meta data provide in ERDAS?

A

Statistics

35
Q

What band is best for identifying water?

A

Band 4

36
Q

EM Spectrum “ “?

A

” “ = controls interaction of energy (visible)

37
Q

How do dry areas and water appear on ERDAS?

A

Water = Black (absorbs energy)

Dry areas = White (reflects energy)

38
Q

Visible, NIR, MIR, and FIR “ “

A 
Visible = "pigments" (0.4 - 0.7 um)
NIR = "cell structure" (0.7 - 1.3 um)
MIR = "moisture" (1.3 - 3.0 um)
FIR = "thermal" (7.0 - 15.0 um)

Remote Sensing (3 decks)

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