Radiometric Calibration Review at St. John Paul II College of Davao
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Questions and Answers

What are the two opposite ways in which the atmosphere influences radiance?

  • Reflection and absorption
  • Elevation and distance
  • Path radiance and incident radiation (correct)
  • Scattering and absorption

How does the atmospheric effects vary with wavelength?

  • Rayleigh scattering occurs at all wavelengths equally
  • Rayleigh scattering is more pronounced at shorter wavelengths (correct)
  • The atmosphere has no effect on wavelength
  • Rayleigh scattering is more pronounced at longer wavelengths

What does radiometric calibration and correction processes aim to achieve?

  • To enhance the atmospheric effects on energy recording
  • To increase the intensity of radiation scattered by the atmosphere
  • To obtain only the actual surface values (correct)
  • To reduce the sensor's ability to detect radiation

Which type of radiation involves the energy that illuminates the surface?

<p>Incident radiation (C)</p> Signup and view all the answers

What does a sensor record for each pixel as a digital number?

<p>Intensity of electromagnetic radiation (B)</p> Signup and view all the answers

Why does the irradiance vary throughout the year?

<p>Seasonal differences in solar elevation and Earth-Sun distance (B)</p> Signup and view all the answers

Why is radiometric calibration and correction important in remotely sensed data?

<p>To improve the interpretability and quality of the data (A)</p> Signup and view all the answers

What is the primary purpose of converting an image from radiance to reflectance?

<p>To obtain accurate reflectance values for comparison (D)</p> Signup and view all the answers

Why do the spectral signatures differ when correcting an image from radiance to reflectance?

<p>Because of changes in the atmospheric conditions (A)</p> Signup and view all the answers

Which factor can influence the energy recorded by sensors on aircraft or satellites?

<p>Sun's azimuth and elevation (C)</p> Signup and view all the answers

What is a common reason for conducting radiometric corrections when comparing multiple data sets over time?

<p>Variations in atmospheric conditions (C)</p> Signup and view all the answers

Why is it essential to account for radiometric errors when obtaining ground radiance or reflectance values?

<p>To ensure accuracy by compensating for atmospheric influences (B)</p> Signup and view all the answers

What does Landsat data need in order to carry out the calibration process?

<p>Metadata file (A)</p> Signup and view all the answers

In Landsat data, what does the conversion to reflectance not require?

<p>Conversion to radiance (B)</p> Signup and view all the answers

What is the purpose of converting data from thermal sensors to Brightness Temperature?

<p>Measuring emitted radiance of a surface (B)</p> Signup and view all the answers

Which factor do equations used for rescaling DN data take into account for calibration purposes?

<p>Differences in illumination geometry (C)</p> Signup and view all the answers

What is the unit typically used to express Brightness Temperature?

<p>Kelvin (K) (B)</p> Signup and view all the answers

Which software feature helps Landsat data conversion directly to reflectance?

<p>Radiometric calibration tools (D)</p> Signup and view all the answers

What is the purpose of radiometric calibration in optical remote sensing imagery?

<p>To convert raw image data to a common physical scale based on reflectance measurements (A)</p> Signup and view all the answers

Why is radiometric calibration important for imagery analysis?

<p>It ensures successful conversion of raw image data to known reflectance measurements (B)</p> Signup and view all the answers

What does each pixel in a spectral image have a signature based on?

<p>The object or objects it represents (B)</p> Signup and view all the answers

Which type of calibration ensures that you can use satellite or aerial imagery in mapping applications?

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

What is another term for radiometric calibration?

<p>Radiometric transformation (A)</p> Signup and view all the answers

Why is accurate radiometric calibration essential for successful imagery analysis?

<p>To ensure high-quality and useful results from the images (D)</p> Signup and view all the answers

What is the purpose of atmospheric correction in remote sensing?

<p>To remove the effects of the atmosphere and produce surface reflectance values (B)</p> Signup and view all the answers

In the context of Landsat 8 TIRS, how is the at-satellite brightness temperature calculated?

<p>Using the thermal constant provided in the metadata file (B)</p> Signup and view all the answers

Why is knowledge of atmospheric conditions and aerosol properties important for atmospheric correction?

<p>To accurately apply the correction and produce meaningful results (B)</p> Signup and view all the answers

What do atmospheric models help in accounting for in remote sensing?

<p>Effects of scattering and absorption in the atmosphere (C)</p> Signup and view all the answers

How can satellite data contribute to estimating atmospheric aerosols?

<p>By helping estimate the amount and distribution of atmospheric aerosols (D)</p> Signup and view all the answers

Why do some software packages include special atmospheric correction modules?

<p>To utilize atmospheric radiation transfer models and produce accurate surface reflectance estimates (A)</p> Signup and view all the answers

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