Remote Sensing Questions Chapter 7

  1. What are the two types of remote sensing devices that operate in the microwave bands?
  2. How does sonar differ from radar?
  3. How does radar work?
  4. What is a major advantage of long-wavelength radars?
  5. Of what is the tonal record of a radar image a measure?
  6. How are good reflectors depicted in a radar image?
  7. What type of radar is used for weather forecasting, navigation, and air-traffic control?
  8. What are the two types of SLARs?
  9. What is the primary difference between these two?
  10. What two groups have operated research SAR systems?
  11. Of what are the incidence angle and grazing angle a function?
  12. When the terrain is horizontal, what is the relationship between the depression and grazing angles?
  13. When the terrain is horizontal, what is the relationship between the look and incidence angles?
  14. What is a prime capability of a SLAR system?
  15. What are the six parts of a RAR?
  16. How does a RAR work?
  17. What two factors control the size of the pulse rectangle?
  18. How does ground range resolution change with increased distance from the ground track?
  19. How can resolution be improved?
  20. What is the minimum pulse length?
  21. What is determined by the width of the terrain strip illuminated by the radar pulse?
  22. Of what is the along-track resolution a function?
  23. As range increases, what happens to beamwidth?
  24. As range increases, what happens to the azimuth resolution?
  25. What two changes can improve azimuth resolutions?
  26. Summarize the three ways to improve azimuth resolution of RAR.
  27. Why was SAR developed?
  28. What is the relationship of antennae length to range on a SAR?
  29. What information is processed to produce a phase history?
  30. On what two media are phase histories traditionally recorded?
  31. When making a visual image of a radar hologram, where is image film positioned?
  32. What is the theoretic limit of azimuthal resolution for SAR?
  33. What is the resolution of civilian SARs?
  34. What terms are used for HH-HV and VV-VH image pair scenarios?
  35. What is the condition when the backslope angle equals the depression angle?
  36. What factors determine the length of the radar shadow?
  37. How are the feature height and the slant-range distance related to the shadow length?
  38. How are the platform height and depression angle related to the shadow angle?
  39. What are the four shadow rules?
  40. What is the effect of the juxtaposition of a strong returen from a foreslope and no return from a backslope?
  41. When is foreshortening most severe?
  42. What is an extreme case of foreshortening?
  43. What is a fundamental system parameter that influences backscatter strength?
  44. That like-polarized backscatter results from single reflections along a feature'ssurface is known by what term?
  45. What causes depolarization?
  46. What type of polarization is most sensitive to plant stocks and tree trunks?
  47. What type of polarization is most sensitive to physical and cultural surfaces?
  48. What type best penetrates mantles of dry sand?
  49. What are the rules for interpreting radar images with different polarities?
  50. When does maximum backscatter occur?
  51. What are the two types of penetration to e considered when dealing with imaging radars?
  52. What radar band will best penetrate haze, dust, fog, and most clouds?
  53. What bands are considered all weather?
  54. What conditions are necessary for subsurface radar imaging?
  55. What is the relationship between penetration depth and vegetation canopy thinckness and the moisture content?
  56. What two factors influence the tones of a radar image?
  57. Should the near range of a radar image be placed at the top or bottom when viewed?
  58. Describe the tone of a homogenous surface?
  59. How should the sizes of metal objects be interpreted on a radar image?
  60. How is relief displacement for vertical features above the datum plane?
  61. How is displacement in the along-track dimension?
  62. How can stereo radar coverage be achieved?
  63. As the difference in the depression angles increases, how is the vertical exaggeration effected?
  64. What are the scales for the available strip images?
  65. What was the first NASA satellite imaging radar system?
  66. From where can SIR images be obtained?
  67. What do passive microwave radiometers detect?
  68. What terms are used for these instruments that produce images?
  69. How do passive microwave scanners differ from thermal IR scanners?
  70. Why must passive microwave systems have large instantaneous fields of vision?
  71. How is the microwave radiance of a passive microwave radiometer expressed?
  72. How are brightness temperatures determined?
  73. How does the speed of sound compare to electromagnetic radiation?
  74. What are the two types of sonars?
  75. What systems are used to produce bathymetric charts?
  76. What are the three components of sidescan sonar?
  77. One a sonar printout, what is represented by light tones?
  78. On a digital sonar, what is represented by light tones?
  79. How are acoustic shadows depicted?
  80. How are rough materials indicated on a sonar image?
  81. What is the name of the reconnaissance-scale mapping program which used GLORIA?