Principles of Remote Sensing Quiz
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Questions and Answers

Which element of remote sensing involves the transmission and reception of energy?

  • Recording of the reflected energy by the sensor
  • Propagation through the atmosphere
  • Energy or illumination source
  • Transmission and reception (correct)

What is the common source of radiation for the electromagnetic spectrum?

  • Microwave and broadcast radio waves
  • Ultraviolet rays
  • The Earth
  • The Sun (correct)

Which form of electromagnetic energy is specifically mentioned as being transmitted from the Sun to the Earth?

  • Radio waves
  • Visible light (correct)
  • X-rays
  • Heat

What is the range of the electromagnetic spectrum in terms of wavelengths?

<p>Shorter wavelength at gamma rays to longer wavelengths at microwave and broadcast radio waves (B)</p> Signup and view all the answers

What is the definition of remote sensing?

<p>Collection of information about an object without coming into physical contact with it (C)</p> Signup and view all the answers

What is the range of wavelengths for the visible region of the electromagnetic spectrum?

<p>0.4 μm to 0.7 μm (B)</p> Signup and view all the answers

What is the function of specular reflectance?

<p>Leaving at a reflected angle equal to angle of incidence (C)</p> Signup and view all the answers

What is the significance of the spectral signature of materials?

<p>It provides insight into the spectral characteristics of objects/features (A)</p> Signup and view all the answers

Which region has a wavelength ranging from 0.7 μm to 1.0 mm?

<p>Infrared region (A)</p> Signup and view all the answers

What does the reflectance of vegetation indicate about its absorption?

<p>High absorption in red and blue wavelengths (A)</p> Signup and view all the answers

In the context of GIS and remote sensing, what is the primary purpose of image rectification?

<p>To correct for geometric distortions in the image (D)</p> Signup and view all the answers

What is the main objective of radiometric corrections in digital image processing for remote sensing?

<p>To ensure consistency and accuracy in the pixel values of the images (A)</p> Signup and view all the answers

What is the primary role of spectral indices in remote sensing applications?

<p>To quantify specific features or properties of the land or vegetation (C)</p> Signup and view all the answers

What is the key purpose of noise removal in digital image processing for remote sensing?

<p>To ensure clarity and accuracy in the images by reducing unwanted disturbances (C)</p> Signup and view all the answers

In the context of remote sensing, what is the main purpose of spatial enhancements in image processing?

<p>To enhance the visual interpretation and analysis of images (C)</p> Signup and view all the answers

What is the primary purpose of radiometric correction in remote sensing?

<p>To reduce or correct errors in the digital numbers of images (D)</p> Signup and view all the answers

What does radiance measured by a sensor depend on?

<p>Distance between the Earth and the sun and the altitude of the sun above the horizon (C)</p> Signup and view all the answers

What additional information is required to convert raw sensor values (DN) to radiance?

<p>Earth-sun distance, Solar zenith angle, exoatmospheric irradiance (A)</p> Signup and view all the answers

What is included in Landsat Level-2 Science Products?

<p>Surface reflectance, surface temperature, surface reflectance-derived spectral indices, and provisional aquatic reflectance (B)</p> Signup and view all the answers

What is the primary purpose of noise removal in remote sensing images?

<p>To remove unwanted noise including destriping and random noise (A)</p> Signup and view all the answers

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