| Popis: |
The identification of terrestrial objects using hyperspectral measurements is confounded by the influence of the intervening atmosphere that can obscure spectral features through gaseous line absorption and reduce contrast as a result of scattering by aerosols. Although hyperspectral measurements provide an effective source for the estimation of the amount of water vapor the estimate of aerosol properties using spectral radiances is much more uncertain. This deficiency can be remedied by making polarimetric measurements which allow a more accurate and complete retrieval of aerosol properties over land than simple radiance measurements. As a proof of this concept we have made measurements of known ground targets with the HyperSpecTIR (HST), a flexible, airborne hyperspectral imager capable of on-the-fly programmability and the Research Scanning Polarimeter (RSP). Measurements were made both in the mountains near Santa Barbara and at lower altitude near Buellton. The collected data is analyzed, atmospherically corrected and compared to the known spectral reflectance of the ground targets. The capabilities and deficiencies of the measurements, analysis and atmospheric correction technique are discussed. |
