Q. Consider the following statements:
1.LiDAR uses pulsed laser light to measure distances and create high-resolution 3D maps of the Earth’s surface.
2.Bathymetric LiDAR utilizes near-infrared light to map land surfaces, while Topographic LiDAR uses green light to penetrate water.
3.LiDAR data is essential for creating Digital Elevation Models (DEMs) used in Geographic Information Systems (GIS).
Which of the statements given above are correct?

[A] 1 and 2 only

[B] 2 and 3 only

[C] 1 and 3 only

[D] 1, 2 and 3

Answer: C
Notes:

Explanation:

  • Statement 1 is correct: It measures the time of flight of laser pulses to calculate elevation.
  • Statement 2 is incorrect: Topographic uses near-infrared; Bathymetric uses green light (because green light penetrates water better).
  • Statement 3 is correct: It is a primary source for high-accuracy 3D terrain modeling.
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