Podcast
Questions and Answers
What are the two opposite ways in which the atmosphere influences radiance?
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?
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?
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?
Which type of radiation involves the energy that illuminates the surface?
What does a sensor record for each pixel as a digital number?
What does a sensor record for each pixel as a digital number?
Why does the irradiance vary throughout the year?
Why does the irradiance vary throughout the year?
Why is radiometric calibration and correction important in remotely sensed data?
Why is radiometric calibration and correction important in remotely sensed data?
What is the primary purpose of converting an image from radiance to reflectance?
What is the primary purpose of converting an image from radiance to reflectance?
Why do the spectral signatures differ when correcting an image from radiance to reflectance?
Why do the spectral signatures differ when correcting an image from radiance to reflectance?
Which factor can influence the energy recorded by sensors on aircraft or satellites?
Which factor can influence the energy recorded by sensors on aircraft or satellites?
What is a common reason for conducting radiometric corrections when comparing multiple data sets over time?
What is a common reason for conducting radiometric corrections when comparing multiple data sets over time?
Why is it essential to account for radiometric errors when obtaining ground radiance or reflectance values?
Why is it essential to account for radiometric errors when obtaining ground radiance or reflectance values?
What does Landsat data need in order to carry out the calibration process?
What does Landsat data need in order to carry out the calibration process?
In Landsat data, what does the conversion to reflectance not require?
In Landsat data, what does the conversion to reflectance not require?
What is the purpose of converting data from thermal sensors to Brightness Temperature?
What is the purpose of converting data from thermal sensors to Brightness Temperature?
Which factor do equations used for rescaling DN data take into account for calibration purposes?
Which factor do equations used for rescaling DN data take into account for calibration purposes?
What is the unit typically used to express Brightness Temperature?
What is the unit typically used to express Brightness Temperature?
Which software feature helps Landsat data conversion directly to reflectance?
Which software feature helps Landsat data conversion directly to reflectance?
What is the purpose of radiometric calibration in optical remote sensing imagery?
What is the purpose of radiometric calibration in optical remote sensing imagery?
Why is radiometric calibration important for imagery analysis?
Why is radiometric calibration important for imagery analysis?
What does each pixel in a spectral image have a signature based on?
What does each pixel in a spectral image have a signature based on?
Which type of calibration ensures that you can use satellite or aerial imagery in mapping applications?
Which type of calibration ensures that you can use satellite or aerial imagery in mapping applications?
What is another term for radiometric calibration?
What is another term for radiometric calibration?
Why is accurate radiometric calibration essential for successful imagery analysis?
Why is accurate radiometric calibration essential for successful imagery analysis?
What is the purpose of atmospheric correction in remote sensing?
What is the purpose of atmospheric correction in remote sensing?
In the context of Landsat 8 TIRS, how is the at-satellite brightness temperature calculated?
In the context of Landsat 8 TIRS, how is the at-satellite brightness temperature calculated?
Why is knowledge of atmospheric conditions and aerosol properties important for atmospheric correction?
Why is knowledge of atmospheric conditions and aerosol properties important for atmospheric correction?
What do atmospheric models help in accounting for in remote sensing?
What do atmospheric models help in accounting for in remote sensing?
How can satellite data contribute to estimating atmospheric aerosols?
How can satellite data contribute to estimating atmospheric aerosols?
Why do some software packages include special atmospheric correction modules?
Why do some software packages include special atmospheric correction modules?
