quiz 1

Question 1

what is continuity in remote sensing

Answer 1

field based observations are only discrete “points in space. Remote sensing allows for spatially continuous data.

Question 2

what three things does remote sensing provide

Answer 2

1.)continuity
2.)scale
3.)visibility

Question 3

what is scale in remote sensing

Answer 3

scale is the relationship between reality and what is actually displayed

Question 4

Explain active vs passive remote sensing

Answer 4

-active: active is when the remote sensing device emits electromagnetic radiation
-passive: passive is when the sun or other objects send out the electromagnetic radiation

Question 5

true or false: energy can be emitted, transmitted, reflected, or absorbed

Answer 5

true

Question 6

what is electromagnetic radiation

Answer 6

rediation that propagates as a wave of electric and magnetic field perpendicular to each other

Question 7

what is particle radiation

Answer 7

radiation of energy by fast moving subatomic particles

Question 8

what is acoustic radiation

Answer 8

radiation that takes the form of mechanical waves

Question 9

gravitational radiation

Answer 9

takes the form of gravitational waves

Question 10

what is wavelength

Answer 10

wavelength is the distance between peaks

Question 11

what is frequency

Answer 11

frequency is how often you see a peak on the same side

Question 12

what is the relationship between frequency and wavelenght?

Answer 12

inverse relationship. Long wave length means lower frequency

Question 13

what are wave and quanta in electromagnetic radiation, and is electromagnetic radiation made up of both?

Answer 13

yes electromagnetic radiation is made of both waves and quanta.
waves are continuous and quanta are discrete particles

Question 14

is energy inversely related to wavelength?

Answer 14

yes the longer the wavelength the less energy

Question 15

what is the stefen-boltzman law

Answer 15

this law defines the relationship between temperature and energy emited

Question 16

true or false: matter at temps above absolute zero continuously emit electromagnetic radiation

Answer 16

true

Question 17

what is a black body

Answer 17

a blackbody is a hypothetical ideal radiator that totally absorbs and reemits all energy incident upon it

Question 18

does temperature impact wavelength?

Answer 18

yes it does

Question 19

what is wins displacement law

Answer 19

gives you the wavelength of an object based on its heat. You have to convert from celsius to kelvin by adding 273.15. The formula is A/T where A is a constant 2897.8 and T is abosulte temp in kelvin

Question 20

what variables affect radiation going through the atmosphere

Answer 20

-difference in path length
-magnitudde of energy being senses
-atmosphere condition
-wavelength involved

Question 21

what are the two ways atmosphere interacts with radiation

Answer 21

scattering and absorption

Question 22

what is rayleigh scattering

Answer 22

spreading radiation everywhere around a particle because the wavelengths are larger than the particle

Question 23

what is mie scattering

Answer 23

mie scattering the wavelengths are about the size of the particles and the vast majority of scattering is in the direction of the wave

Question 24

what is non selective scattering

Answer 24

the wavelength is smaller than the large particles and scattering is in random directions

Question 25

what are the three fundemental interactions energy has with the earth

Answer 25

transmitted energy, reflected energy, and absorbed energy

Question 26

what is the energy balance equation

Answer 26

incident energy(EI) = reflected energy(ER) + transmitted energy(ET) +absorbed energy (EA) -incident energy is the energy coming in

Question 27

what is spectral reflectance

Answer 27

the portion of incident energy that is reflected

Question 28

what is a spectral reflectance curve?

Answer 28

an average reflectance value compiled from large number of features

Question 29

what is a spectral signature

Answer 29

its the spectral response which allows the assessment of an object. these come from spectral reflectance curves

Question 30

what are the spatial and temporal effects influencing spectral signature

Answer 30

1.)temporal effects: factors change the spectral signature of an object over time 2.)spatial effects: factors that change the spectral signature of a feature at a given point in time at different locations

Question 31

what is atmospheric correction

Answer 31

difference between two "signatures" caused by atmospheric scattering and absorption in the instrument

Question 32

what is geometric impact on spectral signature

Answer 32

geometry impacts the amount of energy reflected by an object

Question 33

what is specular reflectors

Answer 33

are flat surfaces that manifest like a mirror

Question 34

what are diffuse reflectors

Answer 34

reflectors are rough surfaces that reflect uniformly in all directions

Question 35

for remote sensing do we want diffuse of specular reflectors

Answer 35

we want diffuse

Question 36

describe spectral bands

Answer 36

every sensor records certain energy wave lengths that can then be chopped into even finer portions of the wavelength known as bands

Question 37

what is a digital number

Answer 37

a digital number is a value assigned to each pixel that represnets energy or the color is has

Question 38

what are the 3 ways images are stored

Answer 38

1.) band sequential 2.)band interlead by line 3.) band interlead by pixel

Question 39

what is DSM

Answer 39

digital surface model which describes the elevation of uppermost surfaces

Question 40

what is DTM

Answer 40

digital terrain model which is elevation of bare land

Question 41

what is DEM

Answer 41

digital elevation model which is a general description of elevation

Question 42

what is the canopy height model and how do you get canopy heights

Answer 42

you subtract DSM from DTM to get CHM which is height of trees

Question 43

what are the 3 ways reference data might be used

Answer 43

1.) to aid in analysis and interpretation of data 2.)to calibrate a sensor 3.)to verify data information

Question 44

what are the 4 distortions of map projections

Answer 44

-shape -size -distance -bearing

Question 45

when making a map projection how many out of the 4 distortions are you able to choose

Answer 45

you can only ever not have 2 aspects distorted out of the 4

Question 46

what are the basic elements of image interpretation

Answer 46

-shape -size -pattern -tone -texture -shadow -site

Question 47

what are the 4 types of resolution

Answer 47

1.)temporal 2.)spatial 3.)spectral 4.)radiometric

Question 48

describe temporal resolution

Answer 48

how often the same area is observed to detect changes over time

Question 49

describe spatial resolution

Answer 49

spatial resolution is the limit on how small an object can be on earths surface and still be delineated from its surroundings

Question 50

describe spectral resolution

Answer 50

sensors ability to distinguish features based on spectral properties -depends on the number of spectral bands and wave lengths

Question 51

describe radiometric resolution

Answer 51

sensors ability to differentiate among brightness

Question 52

true of false: spatial resolution is inversely related to the number or wavelengths (spectral resolution) and the radiometric resolution

Answer 52

true

Question 53

describe how spatial resolution is a function of sensor size

Answer 53

with a larger pixel you get worse resolutions therefore smaller sensors have better resolution but a smaller area is seen. because these sensors are small they also capture little energy and might not see anything

Question 54

what are the 3 types of projections

Answer 54

1.)cylindrical 2.)conical 3.)planar

Question 55

what is gnomic, orthographic and stereographic

Answer 55

these are all view points on earth 1.)othorgraphic:lines point down towards infinity and are parallel, its the best in theory 2.)gnomonic is a view point at earths center 3.)stereogrphic is a view point at earths surface