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Question

Which of the following is a MISMATCH?
Wavelength $\mu m$DescriptionExamples of use
A.0.58 – 0.68VisibleHuman inhabitation
B.0.725 – 1.10Near InfraredLand, Water differences, penetrates Haze
C.3.55 – 3.93InfraredTemperature difference, cloud heights
D.10.30 – 11.30InfraredThermal mapping, water vapour correction

The correct answer is
D

Identifying Wavelength Description Mismatch

The question asks to identify the mismatch among the provided descriptions for different electromagnetic wavelength bands used in remote sensing.

Analysis of Options

  • Option A: The 0.58 – 0.68 $\mu m$ range corresponds to visible light. 'Human inhabitation' is a plausible context for visible light imagery.
  • Option B: The 0.725 – 1.10 $\mu m$ range is Near Infrared (NIR). NIR is effective for distinguishing land and water and has better haze penetration than visible light.
  • Option C: The 3.55 – 3.93 $\mu m$ range falls within the Mid-wave Infrared (MWIR) spectrum. This band is sensitive to temperature differences and can be used for assessing cloud properties like height (via temperature).
  • Option D: The 10.30 – 11.30 $\mu m$ range is in the Long-wave Infrared (LWIR) or Thermal Infrared (TIR) spectrum.

Mismatch Explanation

The description for Option D states 'Thermal mapping, water vapour correction'.

  • Thermal Mapping: The 10.30 – 11.30 $\mu m$ band is indeed primarily used for thermal mapping, as it measures emitted thermal radiation related to surface temperature.
  • Water Vapour Correction: However, this band is significantly affected by atmospheric water vapour, which absorbs thermal radiation. Therefore, while thermal imagery requires correction for water vapour effects, the band itself is not typically used for performing water vapour correction. This makes 'water vapour correction' an inaccurate description of the band's primary application or function in this context.

Options A, B, and C present generally accepted descriptions for their respective wavelength ranges.

Therefore, Option D represents the mismatch.

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Important Questions from Remote Sensing Basics

  1. Which one of the following statements about Normalized Difference Vegetation Index (NDVI) is incorrect?
  2. A map is prepared on 1:50,000 scale. How many cm on the map represents 1.0 km on the ground?

  3. Which one of the following pairs helps to distinguish between different types of rocks and soils?

  4. What is the typical period of revolution of a polar-orbiting Earth satellite, orbiting at a height of $\sim 700\text{ km}$ from the Earth's surface?
  5. To distinguish between different rock types, a sensor with high _____ resolution is best
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