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Principles of Electromagnetic Spectrum and Satellite Platforms

Quiz Questions

1. Remote sensing describes the collection of data about an object, area, or phenomenon from a distance with a device that is not in contact with the object. More commonly, the term remote sensing refers to imagery and image information derived by both airborne and satellite platforms that house sensor equipment.
2. ___________ is synonymous to many terms, including electromagnetic radiation, radiant energy, energy, and radiation.
Electromagnetic energy
Electrical energy
3. The overall process of remote sensing can be broken down into five components. These components are:
1) an energy source;
2) the interaction of this energy with particles in the atmosphere;
3) subsequent interaction with the ground target;
4) energy recorded by a sensor as data; and
5) data displayed digitally for visual and numerical interpretation.
4. ________________ illustrates the basic elements of airborne and satellite remote sensing systems.
Figure 2-1
Figure 2-2
5. Primary components of remote sensing are _____________________________.
Electromagnetic energy is emitted from a source.
Energy interacts with surface objects.
Energy is detected and recorded by the sensor.
All of the above
None of the above
6. Electromagnetic energy has two components, the electric and magnetic fields. This energy is defined by its wavelength ( ) and frequency ( ).
7. Electromagnetic waves are measured from wave crest to wave crest or conversely from trough to trough. This distance is known as wavelength and is expressed in units of micrometers (┬Ám) or nanometers (nm).
8. The ___________________________ Law states that the total energy radiated by a black body per volume of time is proportional to the fourth power of temperature.
Wien’s Displacement
9. Rayleigh scattering, Mie scattering, and nonselective scattering are three types of scatter that occur as radiation passes through the atmosphere. These types of scatter lead to the redirection and diffusion of the wavelength in addition to making the path of the radiation longer.
10. Rayleigh scattering occurs when an atmospheric particle diameter is equal to the radiation’s wavelength (Φ = Ψ).
11. The equation for determining radiance from the digital number is L = (Lmax – Lmin)/255 × DN + Lmin where DN represents ________________________.
Digital number
12. Spectral resolution is the size and number of wavelengths, intervals, or divisions of the spectrum that a system is able to detect. Fine spectral resolution generally means that it is possible to resolve a large number of similarly sized wavelengths, as well as to detect radiation from a variety of regions of the spectrum.