Analysis of View-angle Effects in Hyperspectral Data of Urban Areas
نویسنده
چکیده
Data from the Hyperspectral Mapper (HyMap), which is acquired with a field of view (FOV) of 61.3 degrees, is disturbed by the bidirectional behavior of the covered surface and its complex geometry. The resulting phenomena, an across-track brightness gradient and spectral differences caused by shifted objects, were described and analyzed in detail. An appropriate correction method for the object shift does not exist; its influence on the spectral information is severe, though, due to the great illumination differences caused by facades that are visible at large view angles. These either very bright or dark facades require the user to take into account the resulting spectral influences. Concerning the brightness gradient, it was shown that different surfaces have different bidirectional properties and a correction thus requires an approach, where an individual correction function is fit to each surface type. * Corresponding author
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