Components of Remote Sensing
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Questions and Answers

What is the primary difference between active and passive remote sensing?

  • The frequency of electromagnetic energy
  • The wavelength of electromagnetic energy
  • The type of electromagnetic energy used
  • The source of electromagnetic energy (correct)

    • What is the purpose of a sensor in remote sensing?

  • To store and record data
  • To gather and present electromagnetic energy (correct)
  • To process and analyze data
  • To transmit electromagnetic energy

    • What type of sensors operate within the visible spectrum of electromagnetic radiation?

  • Radar sensors
  • Lidar sensors
  • Optical sensors (correct)
  • Hyperspectral sensors

    • What is the primary function of the sensor in remote sensing?

    <p>To collect and record the electromagnetic radiation</p> Signup and view all the answers

    What does Radar stand for?

    <p>Radio Detection and Ranging</p> Signup and view all the answers

    What is the function of Radar sensors in remote sensing?

    <p>To determine the range, angle, or speed of objects</p> Signup and view all the answers

    What is the final element of the remote sensing process?

    <p>Application</p> Signup and view all the answers

    What type of imaging do Radar sensors use?

    <p>Advanced imaging techniques</p> Signup and view all the answers

    What is the purpose of transmission, reception, and processing in remote sensing?

    <p>To transmit the data to a receiving station for processing</p> Signup and view all the answers

    What is the purpose of electromagnetic energy in remote sensing?

    <p>To gather information about objects</p> Signup and view all the answers

    What is one of the applications of remote sensing in natural resource mapping?

    <p>Crop conditions monitoring</p> Signup and view all the answers

    What is the role of interpretation and analysis in remote sensing?

    <p>To extract information about the target from the image</p> Signup and view all the answers

    What is the primary advantage of active remote sensing?

    <p>It can operate at night or in low-light conditions</p> Signup and view all the answers

    What is the energy source in remote sensing?

    <p>The illumination source</p> Signup and view all the answers

    What is the interaction with the atmosphere in remote sensing?

    <p>The energy is transmitted through the atmosphere</p> Signup and view all the answers

    What is the purpose of remote sensing in urban planning?

    <p>To update road infrastructure</p> Signup and view all the answers

    What is the primary focus of remote sensing?

    <p>Measuring the radiation reflected from targets</p> Signup and view all the answers

    What is the relationship between the angle of incidence and the angle of reflection in reflection?

    <p>The angle of incidence is equal to the angle of reflection</p> Signup and view all the answers

    What is spectral reflectance?

    <p>The ratio of energy reflected to energy incident on the surface</p> Signup and view all the answers

    What is the result of more reflection of blue light?

    <p>Blue color</p> Signup and view all the answers

    Why do leaves appear green?

    <p>Because they reflect radiation in the green wavelengths</p> Signup and view all the answers

    What is the graphical representation of the spectral response of an object over different wavelengths of the electromagnetic spectrum called?

    <p>Spectral reflectance curve</p> Signup and view all the answers

    What do spectral reflectance curves provide insight into?

    <p>The spectral characteristics of objects</p> Signup and view all the answers

    Why are spectral reflectance curves used in remote sensing?

    <p>To select a particular wavelength band for data acquisition</p> Signup and view all the answers

    What is the primary requirement for remote sensing?

    <p>An energy source to illuminate the target</p> Signup and view all the answers

    What type of wave pattern does electromagnetic energy exhibit?

    <p>Harmonic sinusoidal wave pattern</p> Signup and view all the answers

    What is the velocity of electromagnetic waves?

    <p>3×10^8 m/s</p> Signup and view all the answers

    What is the unit of measurement for the wavelength of electromagnetic radiation?

    <p>Micrometers</p> Signup and view all the answers

    What is the frequency of electromagnetic radiation measured in?

    <p>Hertz (Hz)</p> Signup and view all the answers

    Why is it important to understand the characteristics of electromagnetic radiation?

    <p>To extract information from remote sensing data</p> Signup and view all the answers

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

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

    What is the range of wavelengths for the infrared region of the electromagnetic radiation spectrum?

    <p>0.7 to 100 μm</p> Signup and view all the answers

    What is the primary factor that determines the type of platform used in a particular application?

    <p>Type of sensor to be attached</p> Signup and view all the answers

    What is the maximum height of mobile hydraulic platforms used in ground-based platforms?

    <p>15 m</p> Signup and view all the answers

    What is the primary advantage of using airborne platforms?

    <p>High spatial resolution images</p> Signup and view all the answers

    What is the typical altitude range of space-borne platforms?

    <p>250 to 36,000 km</p> Signup and view all the answers

    What is the primary disadvantage of using airborne platforms?

    <p>High cost per unit area of ground coverage</p> Signup and view all the answers

    What is the primary advantage of using space-borne platforms?

    <p>Cover large areas and repetitive coverage</p> Signup and view all the answers

    What type of platform is used for studying properties of a single plant?

    <p>Ground-based platform</p> Signup and view all the answers

    What is the typical use of downward or sideward looking sensors?

    <p>Obtaining high spatial resolution images</p> Signup and view all the answers

    Study Notes

    Components of Remote Sensing (RS)

    • The remote sensing process involves six components: Energy Source or Illumination (A), Interaction with the Atmosphere (B), Interaction with the Target (C), Recording of Energy by the Sensor (D), Transmission, Reception, and Processing (E), Interpretation and Analysis (F), and Application (G)

    Remote Sensing Process

    • Recording of Energy by the Sensor (D): a sensor is required to collect and record the electromagnetic radiation reflected or emitted from the target
    • Transmission, Reception, and Processing (E): the energy recorded by the sensor is transmitted to a receiving and processing station where the data are processed into an image
    • Interpretation and Analysis (F): the processed image is interpreted to extract information about the target
    • Application (G): the extracted information is applied to better understand the target, reveal new information, or assist in solving a particular problem

    Applications of Remote Sensing

    • Remote sensing is useful for various applications in urban planning and transportation, natural resource mapping, and more

    Electromagnetic Energy (EM)

    • Electromagnetic energy is a form of energy that travels in a harmonic sinusoidal wave pattern
    • It has both electric and magnetic components that oscillate perpendicular to each other and perpendicular to the direction of energy propagation
    • EM energy can be described in terms of its velocity, wavelength, and frequency
    • The velocity of EM energy is approximately 3 × 10^8 m/s, wavelength is typically expressed in micrometers (μm), and frequency is expressed in Hertz (Hz)

    Electromagnetic Radiation Spectrum

    • The EM spectrum ranges from gamma rays with very short wavelengths to radio waves with very long wavelengths
    • The visible region occupies a small range between 0.4 and 0.7 μm, while the infrared (IR) region spans between 0.7 and 100 μm
    • The EM spectrum is divided into regions or intervals of different wavelengths, denoted by different names

    Passive and Active Remote Sensing

    • Passive remote sensing uses natural energy sources such as the Sun, while active remote sensing provides its own energy source for illumination
    • Examples of active remote sensing include radar and lidar

    Sensor Definition

    • A sensor is a device that detects and responds to some type of input from the physical environment
    • In remote sensing, a sensor is a device that gathers electromagnetic energy and presents it in a form suitable for obtaining information about the object under investigation

    Sensor Types

    • Optical sensors primarily operate within the visible spectrum and are used to create images of the Earth's surface
    • Radar sensors utilize micro or radio waves to determine the range, angle, or speed of objects and create high-resolution images of the Earth's surface

    Sensor Platforms

    • Platforms can be ground-based, air-borne, or space-borne
    • Ground-based platforms are used for close-range characterization of objects and have high spatial resolution
    • Air-borne platforms are used to obtain images of the Earth's surface and have high spatial resolution (20 cm or less)
    • Space-borne platforms are used to cover large areas and have repetitive coverage of an area of interest

    Energy Interactions with Earth Surface Features

    • Reflection: incident energy is redirected in such a way that the angle of incidence is equal to the angle of reflection
    • Spectral reflectance: the ratio of energy reflected by the surface to the energy incident on the surface, measured as a function of wavelength
    • Spectral reflectance curves: graphical representation of the spectral response of an object over different wavelengths of the electromagnetic spectrum, used to gain insight into the spectral characteristics of different objects

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    Description

    This quiz covers the components of remote sensing, including recording of energy by the sensor, transmission, reception, and processing of electromagnetic radiation.

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