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How is at-sensor reflectance calculated for Landsat 4-5 or Landsat 7?

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How is at-sensor reflectance calculated for Landsat 4-5 or Landsat 7?


Before at-sensor reflectance can be determined for Landsat 4-5 or Landsat 7 data, the radiance needs to be first calculated using the Digital Number (DN) values. Details on the conversion to radiance, and radiance to reflectance can be found in the Landsat 7 Data Users Handbook.


Landsat represents the world's longest continuously acquired collection of space-based moderate-resolution land remote sensing data. Four decades of imagery provides a unique resource for those who work in agriculture, geology, forestry, regional planning, education, mapping, and global change research. Landsat images are also invaluable for emergency response and disaster relief.


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