GIS 255 Midterm Review

  1. What are the five parts of a remote-sensing "system"?



    B. The answer is A.
  2. What is the order of the four steps of the remote-sensing process?



    B. The answer is C.
  3. In what units is electromagnetic radiance (L) measured?



    A. The answer is B.
  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?



    D. The answer is B.
  5. In L = f(λ, sx, y, z, t, θ, P, Ω), what is λ?



    A. The answer is wavelength.
  6. In L = f(λ, sx, y, z, t, θ, P, Ω), what is t?



    D. The answer is A.
  7. In L = f(λ, sx, y, z, t, θ, P, Ω), what is sx, y, z?



    B. Location of the picture element and its size.
  8. In L = f(λ, sx, y, z, t, θ, P, Ω), what is θ?



    A. The answer is A.
  9. In L = f(λ, sx, y, z, t, θ, P, Ω), what is P?



    C. The answer is polarization of back-scattered energy.
  10. What are the three ways energy is transferred?



    B. Conduction, convection, radiation.
  11. What is the difference between scattering and reflection?



    D. The answer is B.
  12. What are the 3 types of scattering?



    D. Rayleigh, Mie, and non-selective.
  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.



    A. The answer is radiant flux.
  16. TCPED stands for Tasking, Collection, Processing, ___________, Dissemination.



    C. Exploitation.
  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
    B. The answer is B.
  18. Are spectral characterization, radiometric calibration, and spherical integrating source pre-launch or post-launch aspects of sensor calibration?



    B. Pre-launch
  19. Which of the following are the post-launch aspects of sensor calibration?



    B. Internal calibrator, full-aperture solar calibrator, partial-aperture solar calibrator.
  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. 1G
  22. At what level are Landsat data systematically terrain-corrected?



    B. 1Gt
  23. At what level are Landsat data terrain-corrected?



    C. 1T
  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?



    B. Georeferencing
  26. What is another term for terrain correction?



    A. Orthorectification
  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.



    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?



    D. Wallops, VA
  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."



    C. Scan line corrector.
  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?



    B. Superimposed bands 4, 3, and 2.
  32. What is meant by true color in the context of Landsat?



    D. Bands 3, 2, and 1.
  33. With true color in Landsat, red is assigned to band _, green to band _, and blue to band _.



    A. 3, 2, 1.
  34. What is the amount of radiant flux per unit of a projected source area in a specified direction?



    A. Radiance
  35. What is the amount of light that reflects off of something divided by the amount of incoming light?



    A. Reflectance
  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)
  39. What is the inclination (in degrees) of the Landsat 7 and 5 sensors?



    D. 98.2
  40. When did the SLC on the Landsat 7 fail?



    D. May 31, 2003
Author
dtarasov
ID
111789
Card Set
GIS 255 Midterm Review
Description
Terms and concepts needed for the remote-sensing midterm.
Updated