14 Questions
What type of remote sensors measure radiant energy reflected or emitted by the Earth?
Passive remote sensors
Which type of remote sensors provide their own energy source for illumination?
Active sensors
What do laser and radar instruments primarily operate as in the field of remote sensing?
Active sensors
What is the primary source of energy for passive remote sensors?
Radiant energy reflected or emitted by the Earth
In what portion of the electromagnetic spectrum do most active sensors operate?
Microwavy portion
What is the function of a laser rangefinder in remote sensing?
Measure the elapse time between sending out an energy signal and receiving it back
Which law states that the total emitted radiation from a blackbody is proportional to the fourth power of its absolute temperature?
Stefan-Boltzmann law
What type of scattering is a function of the wavelength of the incident radiant energy and the size of the gas molecule?
Rayleigh scattering
Which concept refers to a specific range of electromagnetic wavelengths within the Earth's atmosphere where radiation can pass through relatively unimpeded by atmospheric gases?
Reflectance
What is the measure of the optical density of a substance?
Index of refraction
Which type of scattering occurs due to the cumulative effect of the absorption by various constituents, causing the atmosphere to 'close down' in certain regions of the spectrum?
Cumulative scattering
What is the time rate of flow of energy onto, off of, or through a surface called?
Radiant flux
In what law is it stated that the peak wavelength of radiation emitted by a black body is inversely proportional to its absolute temperature?
Wien's displacement law
What is used for precise ranging (distance measurement)?
Phase change
Test your knowledge of passive remote sensing and radiant energy with this quiz. Explore topics such as satellite sensors, resolution, and obtaining information about objects from a distance.
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