QUIZES

Question 1

Instruments that collect a large number of precisely defined wavelength bands are referred to as __________ sensors.

Answer 1

hyperspectral

Question 2

Before images can be used as the basis of precise measurement of areas and distances, they should be corrected for:

a. atmospheric windows
b. Rayleigh scattering
c. bidirectional reflectance
d. terrain relief

Answer 2

d. terrain relief

Question 3

The spectral response of a feature over a range of wavelengths is often referred to as __________.

Answer 3

a spectral signature

Question 4

The optical portion of the electromagnetic spectrum ranges from:

Answer 4

ultraviolet to far infrared

Question 5

Which 3 of the following statements express contributions of the Landsat program to the field of remote sensing for Earth observation? (come back to and update)

Answer 5

1. The availability of Landsat data promoted the use of digital image analysis techniques rather than analog techniques.
2. Scientists and researchers were introduced to the use of multiple, broad wavelength bands for remote sensing analysis.
3. Landsat served as a model for development of other remote sensing systems for Earth observation.

Question 6

True or False: An object is “green” because it reflects equal amounts of blue and yellow light.

Answer 6

False

Question 7

In a remotely sensed image, which of the wavelength bands listed below will likely contain the largest amount of “noise” due to scattering of light in the atmosphere?

a. far infrared
b. mid infrared
c. near infrared
d. blue
e. red
f. green

Answer 7

d. blue

Question 8

Atmospheric effects: (come back to and update)

Answer 8

make a larger proportional contribution to observed brightness for dark objects than for light objects.

Question 9

Specular reflection would most likely be caused by a:

a. lake
b. plant leaf
c. cloud
d. sand dune
e. asphalt

Answer 9

a. lake

Question 10

Select the three statements below that most closely correspond to the three models of remote sensing, as defined by Campbell. (come back to and update)

Answer 10

1. Lidar instruments generate laser pulses and then record the reflections of these pulses from objects on the ground.
2. The thermal bands of Landsat can be used to examine the extent of urban heat islands.
3. Decreases in the amount of green light reflected from a tropical rain forest might be used as an indicator of deforestation.