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Spectral signature sampling (987 words) |
 | Reflectance is the fraction of incident flux that is reflected by a surface. |
| The spectral irradiance may be measured directly by attaching a cosine receptor to the spectroradiometer and pointing the receptor parallel to the surface for which the irradiance is to be measured. |
| The spectral reflectance signatures should in the ideal world be independent of the illumination situation, it is however always preferential to measure the spectral reflectance signatures at conditions similar to the situation when the image data are acquired. |
| Spectral reflectance of whitecaps (279 words) |
| Spectral properties of whitecaps are of importance for color ocean remote sensing and aerosol optical thickness probing from satellite-based instruments. |
| Several experimental measurements of whitecap spectral reflectance have been performed both in the surf zone and in the open ocean, which indicate that oceanic foam cannot be considered as a gray body (e.g., for satellite remote sensing techniques). |
| The model introduced is capable of explaining main features observed, like a sharp decrease of the foam spectral reflectance in the infrared as compared with the visible part of the electromagnetic spectrum and a high correlation of the foam reflectance R and the water absorption coefficient α. |
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