Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Geog 272 > Test 1 > Flashcards

Test 1 Flashcards

(64 cards)

Start Studying
1
Q

remote Sensing

A

acquiring information about a subject without coming into physical contact with it, through use of EMR

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Electromagnetic waves

A

Require water and transmit energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

wavelength

A

the distance between wave crests

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Frequency

A

number of crests passed in one second

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What are the Visible wavelengths?

A

400-700 nm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What are the NIR wavelengths?

A

0.7-1.3 um
7-1.3 nm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What are the IR wavelengths?

A

700 nm-1mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What wavelengths is SW?

A

2.5 um

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What wavelength is LW?

A

2.5um-1mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What happens are energy increases?

A

Frequency increases and wavelength becomes shorter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Source of passive energy?

A

Natural, like the sun

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Source of active energy?

A

Sensor emits radiation
LIDAR and RADAR

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is spectral resolution?

A

the number, location, and bandwidths of EM spectrum and specific sensor is sensitive to

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is spatial resolution?

A

Relative to spectral response function; how close objects we can discriminate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

what is multi-spectral?

A

10s of bands

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

what is hyper-spectral?

A

100s of bands

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is temporal?

A

How frequently we can get the data

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What does temporal depend on?

A

Orbit, Field of View, and radiometric

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What is swath?

A

The width of the coverage
higher the resolution the smaller the swath

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What is radiometric?

A

How many different intensity levels can be discriminated by the remote sensor within a specific band?

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What are the 3 ways to transfer energy from one place or object to another?

A

Conduction, Convection, Radiation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Radiant Flux

A

energy delivered to a surface in a unit of time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Irradiance

A

Radiation that strikes the surface

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Exitance

A

rate at which radiation is emitted from a unit area

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Radiance
radiant flux emitted, reflected, transmitted or received by a unit solid angle per unit projected area
26
Spectral radiance
Radiance of a surface per unit frequency or wavelength
27
Planck's Law
describes the spectral density of EM radiation emitted by a black body in thermal equilibrium at a given temperature T
28
Stefan-Boltzmann Law
Defines the relationship between total emitted radiation (W) and temperature
29
Wien's displacement law
Specifies the relationship between wavelength of radiation emitted and the temperature of a blackbody
30
what is scattering
redirection of EM energy by particles suspended in the atm or by large molecules of atm gasses
31
What does scattering depend on?
sizes of particles, abundance, wavelength of radiation, depth of atm
32
Reyleight scattering
Particle sizes are small compared to wavelength of em radiation Dominant high in the atm wavelength dependent 1/λ^4
33
Mie scattering
caused by larger atmospheric particles occurs with particles that are 0.1 to 10 times the size of the wavelength wavelength dependent absorbs more in short wavelength scatter more in longwave
34
Nonselective
wavelength is MUCH SMALLER than the particle size is not wavelength dependent
35
absorption
occurs when the atm prevents transmissions of radiation or its energy through the atm
36
Refraction
bending of light rays at the contact area between two media that transmit light Snells law
37
Reflectance
fraction of reflected flux to the incident flux
38
Absorbance
Fraction of absorbed flux to the incident flux
39
Transmittance
Fraction of transmitted flux to the incident flux
40
Reflections
a ray of light is redirected as it strikes a nontransparent surface
41
Spectral Reflectance
the surface is smooth, redirects all, or almost all, of the incident radiation in a single direction
42
Diffusive Reflectance
Surface is rough and energy is scattered in all directions
43
Lambertian surface
reflects light equally in all directions
44
Backwards scattering
Sun is behind the observer hiding most of the shadows Reflection will be high
45
The bright spot in backwards scattering
hot spot
46
Nadir Observations
Reflectance will have medium values 0 incident angle
47
Forward Scattering
sun and viewer are in opposite directions reflectance will have low values
48
Hot Spot
Occurs when the azimuth and zenith angle are equal to the sun
49
Anisotropy factor
The ratio of the radiance at a specific viewing geometry divided by the radiance at a nadir viewing geometry
50
Bidirectional reflectance distribution function
A mathematical description of the optical behavior of a surface with respect to angles of illumination and observation, given that is has been illuminated with a parallel beam of light at a specific azimuth and elevation
51
What is the dominating factor when measuring in visible for vegetation?
Leaf pigment, low reflectance causes green
52
What is the dominating factor when measuring in NIR for vegetation?
Multiple scattering within the cell structure
53
What is the dominating factor when measuring in SWIR for vegetation?
two absorption areas caused by water in the leaf
54
Reflectance in soil depends on?
Soil moisture, organic matter, soil texture, and iron oxide
55
How does increasing soil moisture content change reflectance?
Inverse relationship, as soil moisture goes up, reflectance goes down
56
How does increasing organic matter content change reflectance?
decreases reflectance
57
How does increasing soil texture change reflectance?
Portion of clay, silt, and ssand affects the ability to contain moisture and roughness
58
what particle size leads to high reflectance?
finer particles
59
Coarse particles have _________ reflectance?
lower
60
Does water absorb or reflect more?
more absorption
61
Describe the reflectance spectral plot for snow
High reflectance near 1 in the visible and decreases in the near IR with reflectance near to 0 from 1.5 um.
62
How does reflectance act with age?
it decreases with age, fresh snow has high reflectance than ice
63
Surface Albedo
the ratio of the radiant flux reflected from a unit surface area into the whole hemisphere to the incident radiant flux of hemisphere to the incident radiant flux or hemispherical angular extent
64
atmospheric correction
To perform quantitative analyses of RS data requires removal of the atmospheric effects from the measurements

Geog 272 (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions