Section 3.1 Flashcards Preview

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Flashcards in Section 3.1 Deck (40):
1

Instantaneous field of view refers to ....

Smallest unit recordable for a sentence

2

Identify the variables:

D = HB

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

3

Angular field of view is ....

The apparent field of view of a sensor

4

Optical sensors cover _____ to _____ nm on the electromagnetic spectrum

400, 2500

5

True or false
An electromechanical scanner is an active scanner

False

6

An electrochemical scanner is a _______ scanner with wide channels

Passive

7

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

Rotating mirror

8

True or false
Electromechanical scanners have large spatial coverage

True

9

Two issues associated with electrochemical scanners are:

Mirror velocity profile variation
Scan line length variation

10

What type of scanner is a Landsat?

Electrochemical

11

What is a limiting factor when looking at image interpretation?

Resolution/pixel size

12

True or false
Landsat is a multispectral scanner

True

13

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

Blue, green, red, NIR
80 m

14

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

Passive, discrete

15

Pushbroom scanner uses .....

Charged couple devices

16

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

Pushbroom, perpendicular

17

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

Multispectral image

18

Give two examples of a pushbroom scanner.

AISA
CASI

19

What is the resolution of a AISA image?

2m

20

True or false
Spectrometers acquire image data

False

21

What are four sensor types?

Electrochemical
Pushbroom
Spectrometer
Imaging spectrometer

22

True or false
Spectrometers are usually used in aerial photography.

False, most are ground based

23

What does CCD mean?

Charged couple device

24

Spectrometers can determine reflectance spectra of ...

Leaves, grass, trees

25

True or false
Spectrometers are only used on the ground

False, they can be airborne

26

Spectrometers use a large number of _______ programmed to specific wavelengths

CCD

27

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

Small, continuous

28

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

False, it is a combination of all three

29

Imaging spectrometer creates a true image ______.

Cube

30

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

X and y axis are spatial dimensions
Z axis is spectral

31

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

Complimentary metal-oxide-semiconductor matrix (CMOS)

32

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

Large, large

33

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

Large, high

34

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

Computers

35

Define radiometric resolution.

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

36

Finer radiometric resolution means _______ sensitivity

More

37

Radiometric resolution determines the range of _________

Possible digital numbers

38

Greater data depth means greater....

Precision.

39

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

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

40

What is a histogram?

A chart that shows the frequency distribution of data.