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How is at-sensor reflectance calculated?

at-sensor calculated Reflectance
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How is at-sensor reflectance calculated?

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Before at-sensor reflectance can be determined, the radiance needs to be first calculated using the Digital Number (DN) values. Section 11.3.1 describes the conversion to radiance, and Section 11.3.2 the radiance to reflectance process, both on the Landsat Data Products page.

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