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Geography 228 > Section 3.1 > Flashcards

Section 3.1 Flashcards

1
Q

Instantaneous field of view refers to ….

A

Smallest unit recordable for a sentence

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2
Q

Identify the variables:

D = HB

A 
D = pixel size
H = sensor altitude
B = instantaneous field of view
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3
Q

Angular field of view is ….

A

The apparent field of view of a sensor

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4
Q

Optical sensors cover _____ to _____ nm on the electromagnetic spectrum

A

400, 2500

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5
Q

True or false

An electromechanical scanner is an active scanner

A

False

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6
Q

An electrochemical scanner is a _______ scanner with wide channels

A

Passive

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7
Q

The angular field of view of an electrochemical scanner is achieved by a _____________

A

Rotating mirror

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8
Q

True or false

Electromechanical scanners have large spatial coverage

A

True

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9
Q

Two issues associated with electrochemical scanners are:

A

Mirror velocity profile variation

Scan line length variation

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10
Q

What type of scanner is a Landsat?

A

Electrochemical

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11
Q

What is a limiting factor when looking at image interpretation?

A

Resolution/pixel size

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12
Q

True or false

Landsat is a multispectral scanner

A

True

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13
Q

What wavelengths do a Landsat pick up in 1972 and what was the resolution?

A

Blue, green, red, NIR

80 m

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14
Q

A pushbroom scanner is a _______ scanner using a _________ linear detector

A

Passive, discrete

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15
Q

Pushbroom scanner uses …..

A

Charged couple devices

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16
Q

Charged couple devices are used in ________ scanners and are oriented _______ to the flight direction

A

Pushbroom, perpendicular

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17
Q

When you use a multiple array of charged couple devices, each programmed to different wavelengths you get a

A

Multispectral image

18
Q

Give two examples of a pushbroom scanner.

A

AISA

CASI

19
Q

What is the resolution of a AISA image?

A

2m

20
Q

True or false

Spectrometers acquire image data

A

False

21
Q

What are four sensor types?

A

Electrochemical
Pushbroom
Spectrometer
Imaging spectrometer

22
Q

True or false

Spectrometers are usually used in aerial photography.

A

False, most are ground based

23
Q

What does CCD mean?

A

Charged couple device

24
Q

Spectrometers can determine reflectance spectra of …

A

Leaves, grass, trees

25
Q

True or false

Spectrometers are only used on the ground

A

False, they can be airborne

26
Q

Spectrometers use a large number of _______ programmed to specific wavelengths

A

CCD

27
Q

Spectrometers cover a very _______ area, but provide _________ spectral information.

A

Small, continuous

28
Q

True or false

Imaging spectrometer is a combination of pushbroom scanners and spectrometers but not electrochemical scanners.

A

False, it is a combination of all three

29
Q

Imaging spectrometer creates a true image ______.

A

Cube

30
Q

In a imaging spectrometer what do the axis of the image cube represent?

A

X and y axis are spatial dimensions

Z axis is spectral

31
Q

Imaging spectrometer uses a two dimensional Charged couple device(CCD) what is another name for this?

A

Complimentary metal-oxide-semiconductor matrix (CMOS)

32
Q

And imaging spectrometer collects ________ spectral data across a _________ spectral range.

A

Large, large

33
Q

Imaging spectrometers collect data over a _______ area with _______ spatial resolution.

A

Large, high

34
Q

Image processing systems (_________) are fundamental tools for remote sensing.

A

Computers

35
Q

Define radiometric resolution.

A

The ability of remote sensing systems to distinguish changes in electromagnetic energy

36
Q

Finer radiometric resolution means _______ sensitivity

A

More

37
Q

Radiometric resolution determines the range of _________

A

Possible digital numbers

38
Q

Greater data depth means greater….

A

Precision.

39
Q

What is the difference between real and integer storage and what are the benefits of real?

A

Integer storage is 8-bit whole numbers
Real storage is 32-bit with fractions.
Real is advantageous because there is finer definition.

40
Q

What is a histogram?

A

A chart that shows the frequency distribution of data.

Geography 228 (10 decks)

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