HERO QUOTE FOR TOPOGRAPHIC CORRECTION

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Topographic Correction

Reflectance retrieval in DROACOR is done based on a horizontal-terrain assumption in the standard processing, resulting in (apparent) bottom-of-atmosphere reflectances. The outputs are still showing illumination variations for non-horizontal surfaces, while absolute reflectance is retrieved for the horizontal case.

A semi-empirical terrain correction using the meta information can optionally being applied as an additional processing step. It’s using information from a digitial surface model which can cover the whole area of an imaging campaign. This processing step requires orthorectified imagery and a corresponding elevation model and can be applied to a whole directory of images in one single step.

Cuprite Nevada data of Hyspex Mjolnir; SWIR false color display, before and after terrain correction.

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