# GIS 255 Midterm Review

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1. What are the five parts of a remote-sensing "system"?
A. Source, sensor, medium, clutter, target.
B. Sensor, medium, albedo. reflectance, atmosphere.
C. Reflectance, atmosphere, clutter, target, coordinate system.
D. Sourse, sensor, medium, reflectance, atmosphere.
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2. What is the order of the four steps of the remote-sensing process?
A. Data collection, statement of the problem, data-to-information conversion, information presentation.
B. Information presentation, data-to-information conversion, statement of the problem, data collection.
C. Statement of the problem, data collection, data-to-information conversion, information presentation.
D. Information presentation, statement of the problem, data collection, data-to-information conversion.
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3. In what units is electromagnetic radiance (L) measured?
A. Roentgens per meter squared per steradian.
B. Volts per meter squared per steradian.
C. Amperes per meter squared per steradian.
D. Watts per meter squared per steradian.
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4. The amount of electromagnetic radiance (L) recorded within the IFOV of an optical remote-sensing system is a function of which of the following?
A. L = f(P, sx, y, z, t, θ, μ, Ω)
B. L = f(λ, sx, y, z, t, θ, P, Ω)
C. L = f(θ, sx, y, z, t, μ, P, Ω)
D. L = f(μ, sx, y, z, t, θ, P, Ω)
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5. In L = f(λ, sx, y, z, t, θ, P, Ω), what is λ?
A. Scattering.
B. Temporal information (how often data are collected).
C. Radiometric resolution at which data are recorded.
D. Wavelength.
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6. In L = f(λ, sx, y, z, t, θ, P, Ω), what is t?
A. Radiometric resolution at which data are recorded.
B. Wavelength.
C. Temporal information (how often data are collected).
D. Scattering.
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7. In L = f(λ, sx, y, z, t, θ, P, Ω), what is sx, y, z?
A. Radiometric resolution (precision) at which the data are recorded.
B. A set of angles that describes the geometric relationships between the source, the target, and the sensor.
C. Polarization of back-scattered energy.
D. Location of the picture element and its size.
D. Location of the picture element and its size.
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8. In L = f(λ, sx, y, z, t, θ, P, Ω), what is θ?
A. Location of the picture element and its size.
B. Radiometric resolution (precision) at which the data are recorded.
C. A set of angles that describes the geometric relationships between the source, the target, and the sensor.
D. Polarization of back-scattered energy.
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9. In L = f(λ, sx, y, z, t, θ, P, Ω), what is P?
A. Polarization of back-scattered energy.
B. A set of angles that describes the geometric relationships between the source, the target, and the sensor.
C. Location of the picture element and its size.
D. Radiometric resolution (precision) at which the data are recorded.
A. The answer is polarization of back-scattered energy.
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10. What are the three ways energy is transferred?
A. Conduction, convection, subduction.
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11. What is the difference between scattering and reflection?
A. There is no difference.
B. The direction of scattering cannot be predicted, the direction of reflection can.
C. Scattering cannot take place in the atmosphere, reflection can.
D. The direction of scattering can be predicted, the direction of reflection cannot.
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12. What are the 3 types of scattering?
A. Rayleigh, Mie, conductive.
B. Rayleigh, Mie, non-selective.
C. Rayleigh, Mie, selective.
D. Rayleigh, Mie, convective.
B. Rayleigh, Mie, and non-selective.
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13. True or false: The type of scattering is a function of the wavelength of the incident radiant energy and the velocity of the molecules of the medium encountered.
A. True
B. False
B. False; it is a function of the wavelength and the size of the molecules.
14. True or false: the angle of incidence and the angle of reflection are equal.
A. True
B. False
A. True
15. Irradiance is a measure of the amount of __________ incident upon a surface per unit area of the surface measured in watts per meter squared.
B. reflectance
C. albedo
D. scattering
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16. TCPED stands for Tasking, Collection, Processing, ___________, Dissemination.
A. Estimation
B. Evaluation
C. Examination
D. Exploitation
D. Exploitation.
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17. Which of the following are the parameters of the Long-Term Acquisition Plan (LTAP) for Landsat data?
A. Seasonality, cloud avoidance, gain settings, sun
angle, missed opportunities, scene clustering, system constraints.
B. Seasonality, land definition, cloud avoidance, gain settings, sun
angle, missed opportunities, scene clustering, system constraints.
C. Seasonality, land definition, cloud avoidance, gain settings, sun
angle, missed opportunities, system constraints.
D. Seasonality, land definition, cloud avoidance, gain settings, sun
angle, missed opportunities, scene variance, system constraints
18. Are spectral characterization, radiometric calibration, and spherical integrating source pre-launch or post-launch aspects of sensor calibration?
A. Neither
B. Pre-launch
C. It depends
D. Post-launch
B. Pre-launch
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19. Which of the following are the post-launch aspects of sensor calibration?
A. Spectral characterization, full-aperture solar calibrator, partial-aperture solar calibrator.
B. Internal calibrator, radiometric calibration, partial-aperture solar calibrator.
C. Internal calibrator, full-aperture solar calibrator, partial-aperture solar calibrator.
D. Internal calibrator, full-aperture solar calibrator, spherical integrating source.
C. Internal calibrator, full-aperture solar calibrator, partial-aperture solar calibrator.
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20. True or false: reflectance is measured in watts per meter squared per steradian.
A. True
B. False
B. False (no units, given as a percentage).
21. At what level are Landsat data corrected both geometrically and radiometrically?
A. 1T
B. 1Gt
C. 1G
D. None of the above.
C. 1G
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22. At what level are Landsat data systematically terrain-corrected?
A. 1G
B. 1T
C. 1Gt
D. None of the above.
C. 1Gt
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23. At what level are Landsat data terrain-corrected?
A. 1G
B. 1Gt
C. 1T
D. None of the above.
C. 1T
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24. True or false: both satellite and aerial data can be orthorectified.
A. True
B. False
A. True.
25. What is another term for geometric correction?
A. Georeferencing
B. Stretched display method
C. Orthorectification
D. None of the above
A. Georeferencing
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26. What is another term for terrain correction?
A. Georeferencing
B. Orthorectification
C. Stretched display method
D. None of the above.
B. Orthorectification
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27. Which of the following is true about the orbits of Landsats 5 and 7?
1. Repetitive, circular, sun-synchronous, near-polar orbits.
2. Nominal altitude: 705.3 km at the equator.
3. Viewing the entire Earth between 81 degrees north and south latitude.
4. Descending orbital node time: ca. 9:45 A.M. at the equator, 14+ orbits per day, viewing the entire Earth every 16 days.
A. 1, 2, and 3
B. 1 and 4 only
C. 1 and 3 only
D. All of the above.
D. All of the above.
28. There are Landsat ground stations at Sioux Falls, SD; Poker Flat, Alaska; Alice Springs, Australia; Svalbard, Norway; and what other place?
A. Heidelberg, Germany
B. Eugene, OR
C. Wallops. VA
D. Marion, IN
C. Wallops, VA
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29. What does the following describe:
"An electro-optical mechanism composed of two parallel nickel-plated beryllium mirrors set at an angle on a shaft. The shaft rotates about an axis normal to the axis of the scan mirror in a saw tooth fashion. The thing is positioned behind the primary optics and compensates for the along-track motion of the spacecraft that occurs during an active SMA cross track scan. A rectilinear scan pattern is produced using this thing instead of the zigzag pattern that would be produced without it."
A. Full-aperture solar calibrator.
B. Spherical integrating source.
C. Partial-aperture solar calibrator.
D. Scan line corrector.
D. Scan line corrector.
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30. True or false: On the ETM+, band 8 is the panchromatic band, ranging from 0.5 to 1.1 micrometers.
A. True
B. False
B. False; band 8 is indeed the panchromatic band, but it ranges from 0.5 to 0.9 micrometers.
31. What is meant by CIR in the context of Landsat?
A. Superimposed bands 4, 3, and 2.
B. Superimposed bands 5, 6, and 7.
C. Superimposed bands 1, 4, and 5.
D. Superimposed bands 2, 6, and 7.
A. Superimposed bands 4, 3, and 2.
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32. What is meant by true color in the context of Landsat?
A. Bands 4, 3, and 2.
B. Bands 4, 6, and 2.
C. Bands 3, 2, and 1.
D. Bands 1, 3, and 4.
C. Bands 3, 2, and 1.
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33. With true color in Landsat, red is assigned to band _, green to band _, and blue to band _.
A. 2, 3, 1.
B. 2, 3, 1.
C. 3, 2, 1.
D. 1, 3, 2.
C. 3, 2, 1.
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34. What is the amount of radiant flux per unit of a projected source area in a specified direction?
A. Exitance
C. Reflectance
D. Scattering
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35. What is the amount of light that reflects off of something divided by the amount of incoming light?
A. Scattering
C. Reflectance
D. Exitance
C. Reflectance
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36. True or false: the purpose of orthorectification is to establish an image’s location in terms of map projections or coordinate systems.
A. True
B. False
B. False; the purpose of orthorectification is to remove distortion from an image.
37. True or false: the purpose of georeferencing is to establish an image’s location in terms of map projections or coordinate systems.
A. True
B. False
A. True
38. How many Landsat 7 bands are there?
A. 7 (+ 1 panchromatic)
B. 8 (+ 1 panchromatic)
C. 6
D. 8
A. 7 (+ 1 panchromatic)
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39. What is the inclination (in degrees) of the Landsat 7 and 5 sensors?
A. 78.2
B. 98.2
C. 68.2
D. 99.2
B. 98.2
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40. When did the SLC on the Landsat 7 fail?
A. March 31, 2003
B. May 31, 2003
C. April 31, 2003
D. June 31, 2003
B. May 31, 2003
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 Author: dtarasov ID: 111789 Card Set: GIS 255 Midterm Review Updated: 2011-10-24 20:52:41 Tags: remote sensing midterm Folders: Description: Terms and concepts needed for the remote-sensing midterm. Show Answers: