Appendix III - Quiz Answers

Fill in the blanks.

1.  Remote sensing refers to the process of gathering information about an object, at a distance, without touching the object itself.

2.  Three major components of electromagnetic radiation are frequency, amplitude, and wavelength.

3.  A major difference between the human eye and remote sensors is the frequency range of light in the electromagnetic spectrum that they are sensitive to.

4.  The electromagnetic spectrum can be sliced up into discrete segments of wavelength ranges called bands, also sometimes referred to as a channel.

5.  The frequency of visible light ranges from a high of .4 µm to a low of .7 µm.

6.  The three primary colors reflected from an object known as additive primaries are the blue, green, and red wavelengths.

7.  Remote sensors operating in the thermal infrared wavelength range measure an object’s temperature.

8.  The sharp increase of reflected energy just beyond the red region of visible light into the near infrared region is referred to as the red edge.

9.  Passive sensors monitor only the natural solar reflected light or electromagnetic energy from an object.

10. The smallest size picture elements on a computer screen are called pixels.

11. Spectral resolution, is the sensitivity of a sensor to respond to a specific frequency range.

12. Change detection is a process where two images at the same location taken on different dates are compared with each other to measure any changes in physical shape, location, or spectral properties.

13. The sensor detectors in a pushbroom scanner are lined up in a row called a linear array.

14. Terrestrial remote sensing systems are ground-based sensor systems.

15. The goal of precision farming is to gather and analyze information about the variability of soil and crop conditions in order to maximize the efficiency of crop inputs within small areas of the farm field.


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