finals_week 7

Question 1

Refers to the sensitivity
of the sensor to the
magnitude of the EM
energy.

Answer 1

Radiometric Resolution

Question 2

It describes its ability to
discriminate very slight
differences in energy.

Answer 2

Radiometric Resolution

Question 3

to correct for uneven sensor response over
the whole image

Answer 3

Radiometric Corrections

Question 4

to correct for geometric distortion due to
Earth’s rotation and other imaging conditions (such as oblique viewing).

Answer 4

Geometric Corrections

Question 5

Corrections applied to the Digital
Numbers (DN’s) of the imagery to
remove or reduce the influence of
atmospheric and solar illumination.

Answer 5

radiometric correction

Question 6

Radiometric correction is used to modify DN values in
order to account for noise, that is, contributions to the
DN that are a function NOT of the feature being
sensed but of:

Answer 6

a. the intervening atmosphere (transmission),

b. the sun-sensor geometry (imaging),

c. the sensor itself (imaging), or

d. the data acquisition and storage process
(digitization)

Question 7

Radiometric correction addresses:

Answer 7

1. Radiometric Correction addresses:
2. Sensor and Processing effects
3. Atmospheric effects
   -Background

    -Absolute correction
   
    -Relative correction

4. Topographic effects

Question 8

Operations intended to remove systematic or random
noise affecting the brightness values of pixels due to
uneven sensor response over the whole image.

Answer 8

Radiometric calibration

Question 9

Interaction of photons with molecules or non-
absorbing aerosols is elastic and photons are
immediately re-emitted in a direction other than
the incident one

Answer 9

SCATTERING

Question 10

scattering of light by particles in its path of size
up to one-tenth the wavelength of the light and occurs
without any loss of energy or change of wavelength

Answer 10

Rayleigh

Question 11

occurs when the diameters of atmospheric
particulates are similar to or larger than the wavelengths of
the light

Answer 11

Mie

Question 12

all wavelengths are scattered about
equally

Answer 12

Non selective

Question 13

Because the solar radiation is
scattered on its travel down through the atmosphere,
a particular pixel will be irradiated both by the direct
radiation and the scattered radiation. The latter is
referred to as the sky irradiance (LP).

Answer 13

Sky Irradiance

Question 14

Because of the scattering alone,
radiation can reach the sensor from adjacent pixels
and also via diffuse scattering of the incoming
radiation that is actually scattering towards the sensor
by the atmospheric constituents before it reaches the
ground. These two components are referred to as path
radiance (LT)

Answer 14

Path Radiance