Weeks 1-4 Flashcards
(23 cards)
what is spatial resolution?
the size of individual pixels
what is spectral resolution?
the number and size of spectral regions the sensor records data in
what is temporal resolution?
how often the sensor acquires data at the same location
what is radiometric resolution?
the sensitivity of detectors to small differences in electromagnetic energy
what is a blackbody?
an object that absorbs and emits all energy that falls upon it
what does stefan-boltzmann equation describe?
the total amount of energy being radiated
what does wien’s equation describe?
the dominant wavelength of the EM radiance of an object
what does Planck’s equation describe?
the radiance of an object at a given temperature at any wavelength
what is rayleigh scattering?
particles are very small compared to the wavelength of the radiation
what is mie scattering?
when the particles are just about the same size as the wavelength of the radiation
what is nonselective scattering?
when the particles are much larger than the wavelength of the radiation
what is specular reflection?
smooth, the average surface profile is several times smaller than the wavelength of the radiation
what is diffuse reflection?
rough, the reflected rays go in many directions
what is lambertian reflection?
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)
what design options must be kept in mind for remote sensing (7)?
color, tone, size/shape, pattern, texture, shadow, association
what are vegetation indices?
algebraic combination of remote sensing bands to provide additional information about vegetation in the image
what is an advantage of vegetation indices?
minimizes the disturbing influences
what wavelength region would you use to differentiate land from pure water?
near-infrared and middle-infrared from 740-2,500 nm
what is spectral reflectance impacted by (soil properties)?
soil texture, soil moisture content, organic matter content, iron-oxide content, and surface roughness
what are some advantages of remote sensing?
large scale of study, does not disturb object or area of interest, no sampling bias
what are some limitations to remote sensing?
often oversold, human error is a possibility, can become uncalibrated, may be expensive
what is refraction?
the bending of light when it passes from a medium of one density to another
what are some different forms of image enhancement?
contrast enhancement, linear stretch, histogram stretch, digital slicing, pan-sharpening
