Section 3.1

Question 1

Instantaneous field of view refers to ….

Answer 1

Smallest unit recordable for a sentence

Question 2

Identify the variables:

D = HB

Answer 2

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

Question 3

Angular field of view is ….

Answer 3

The apparent field of view of a sensor

Question 4

Optical sensors cover _____ to _____ nm on the electromagnetic spectrum

Answer 4

400, 2500

Question 5

True or false

An electromechanical scanner is an active scanner

Answer 5

False

Question 6

An electrochemical scanner is a _______ scanner with wide channels

Answer 6

Passive

Question 7

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

Answer 7

Rotating mirror

Question 8

True or false

Electromechanical scanners have large spatial coverage

Answer 8

True

Question 9

Two issues associated with electrochemical scanners are:

Answer 9

Mirror velocity profile variation

Scan line length variation

Question 10

What type of scanner is a Landsat?

Answer 10

Electrochemical

Question 11

What is a limiting factor when looking at image interpretation?

Answer 11

Resolution/pixel size

Question 12

True or false

Landsat is a multispectral scanner

Answer 12

True

Question 13

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

Answer 13

Blue, green, red, NIR

80 m

Question 14

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

Answer 14

Passive, discrete

Question 15

Pushbroom scanner uses …..

Answer 15

Charged couple devices

Question 16

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

Answer 16

Pushbroom, perpendicular

Question 17

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

Answer 17

Multispectral image

Question 18

Give two examples of a pushbroom scanner.

Answer 18

AISA

CASI

Question 19

What is the resolution of a AISA image?

Answer 19

2m

Question 20

True or false

Spectrometers acquire image data

Answer 20

False

Question 21

What are four sensor types?

Answer 21

Electrochemical
Pushbroom
Spectrometer
Imaging spectrometer

Question 22

True or false

Spectrometers are usually used in aerial photography.

Answer 22

False, most are ground based

Question 23

What does CCD mean?

Answer 23

Charged couple device

Question 24

Spectrometers can determine reflectance spectra of …

Answer 24

Leaves, grass, trees

Question 25

True or false | Spectrometers are only used on the ground

Answer 25

False, they can be airborne

Question 26

Spectrometers use a large number of _______ programmed to specific wavelengths

Answer 26

CCD

Question 27

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

Answer 27

Small, continuous

Question 28

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

Answer 28

False, it is a combination of all three

Question 29

Imaging spectrometer creates a true image ______.

Answer 29

Cube

Question 30

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

Answer 30

X and y axis are spatial dimensions | Z axis is spectral

Question 31

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

Answer 31

Complimentary metal-oxide-semiconductor matrix (CMOS)

Question 32

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

Answer 32

Large, large

Question 33

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

Answer 33

Large, high

Question 34

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

Answer 34

Computers

Question 35

Define radiometric resolution.

Answer 35

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

Question 36

Finer radiometric resolution means _______ sensitivity

Answer 36

More

Question 37

Radiometric resolution determines the range of _________

Answer 37

Possible digital numbers

Question 38

Greater data depth means greater....

Answer 38

Precision.

Question 39

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

Answer 39

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

Question 40

What is a histogram?

Answer 40

A chart that shows the frequency distribution of data.