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GEOG 271 > Weeks 1-4 > Flashcards

Weeks 1-4 Flashcards

1
Q

what is spatial resolution?

A

the size of individual pixels

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2
Q

what is spectral resolution?

A

the number and size of spectral regions the sensor records data in

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3
Q

what is temporal resolution?

A

how often the sensor acquires data at the same location

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4
Q

what is radiometric resolution?

A

the sensitivity of detectors to small differences in electromagnetic energy

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5
Q

what is a blackbody?

A

an object that absorbs and emits all energy that falls upon it

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6
Q

what does stefan-boltzmann equation describe?

A

the total amount of energy being radiated

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7
Q

what does wien’s equation describe?

A

the dominant wavelength of the EM radiance of an object

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8
Q

what does Planck’s equation describe?

A

the radiance of an object at a given temperature at any wavelength

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9
Q

what is rayleigh scattering?

A

particles are very small compared to the wavelength of the radiation

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10
Q

what is mie scattering?

A

when the particles are just about the same size as the wavelength of the radiation

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11
Q

what is nonselective scattering?

A

when the particles are much larger than the wavelength of the radiation

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12
Q

what is specular reflection?

A

smooth, the average surface profile is several times smaller than the wavelength of the radiation

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13
Q

what is diffuse reflection?

A

rough, the reflected rays go in many directions

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14
Q

what is lambertian reflection?

A

the radiant flux leaving the surface is constant for any angle of reflectance to the surface normal (the surface is equally bright in all directions)

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15
Q

what design options must be kept in mind for remote sensing (7)?

A

color, tone, size/shape, pattern, texture, shadow, association

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16
Q

what are vegetation indices?

A

algebraic combination of remote sensing bands to provide additional information about vegetation in the image

17
Q

what is an advantage of vegetation indices?

A

minimizes the disturbing influences

18
Q

what wavelength region would you use to differentiate land from pure water?

A

near-infrared and middle-infrared from 740-2,500 nm

19
Q

what is spectral reflectance impacted by (soil properties)?

A

soil texture, soil moisture content, organic matter content, iron-oxide content, and surface roughness

20
Q

what are some advantages of remote sensing?

A

large scale of study, does not disturb object or area of interest, no sampling bias

21
Q

what are some limitations to remote sensing?

A

often oversold, human error is a possibility, can become uncalibrated, may be expensive

22
Q

what is refraction?

A

the bending of light when it passes from a medium of one density to another

23
Q

what are some different forms of image enhancement?

A

contrast enhancement, linear stretch, histogram stretch, digital slicing, pan-sharpening

GEOG 271 (4 decks)

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