Remote Sensing: Elements and Methods Quiz

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Questions and Answers

Which type of sensors in remote sensing rely on an external source of energy?

  • Infrared sensors
  • Passive sensors
  • Ultraviolet sensors
  • Active sensors (correct)

In remote sensing, how is Electromagnetic Radiation (EMR) primarily used?

  • To create artificial light sources
  • To directly interact with the human eye
  • To gather information about the Earth's surface and atmosphere (correct)
  • To transmit and receive data wirelessly

What is the main function of passive sensors in remote sensing?

  • Generates its own energy for scanning
  • Detects energy naturally emitted by objects (correct)
  • Receives signals from satellites
  • Emits energy to scan the surroundings

What happens when Electromagnetic Radiation interacts with the Earth's surface in remote sensing?

<p>It gets absorbed, reflected, or transmitted based on surface characteristics (A)</p> Signup and view all the answers

How do passive sensors record Electromagnetic Energy in remote sensing?

<p>By receiving naturally emitted energy from objects (B)</p> Signup and view all the answers

Which type of sensors in remote sensing require their own source of energy to operate?

<p>Active sensors (A)</p> Signup and view all the answers

What is the primary method of recording Electromagnetic Energy in remote sensing?

<p>Radiometric measurement (C)</p> Signup and view all the answers

In remote sensing, which factor determines the wavelength range of energy recorded by sensors?

<p>The atmospheric composition (A)</p> Signup and view all the answers

When Electromagnetic Radiation interacts with the atmosphere, which process causes scattering of the radiation?

<p>Absorption (D)</p> Signup and view all the answers

How do Active sensors differ from Passive sensors in terms of data acquisition in remote sensing?

<p>Active sensors measure reflections from their own emitted energy pulses (B)</p> Signup and view all the answers

Flashcards

Active sensors

Sensors that rely on an external energy source.

EMR Use in Remote Sensing

To gather data by measuring reflected or emitted energy.

Passive sensors function

Detecting energy naturally emitted or reflected from objects.

EMR Interaction with Earth

It can be absorbed, reflected, or transmitted.

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Passive sensors recording EMR

By receiving naturally emitted energy.

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Active sensors

Sensors that generate their own energy to measure reflections.

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Primary method of recording EMR

Radiometric measurement.

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Wavelength range determinant

Atmospheric composition.

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Scattering cause of radiation

Absorption

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Active vs. Passive sensors

Active sensors measure reflections from emitted pulses.

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