Radiance modeling
AssigneeAtmospheric and Environmental Research, Inc.
InventorJean-Luc Moncet
Life of this patent
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Abstract
A spectrum is automatically searched to select monochromatic spectral points, monochromatic transmittances or radiances are automatically calculated at the selected monochromatic spectral points, for one or more viewing geometries and for non-homogeneous atmospheres belonging to an ensemble of non-homogeneous atmospheres, and a weighted sum of the monochromatic calculated transmittances or radiances is automatically determined. The individual spectral points are selected so that the weighted sum is representative of calculations of spectrally averaged transmittances or radiances for the viewing geometries and for any non-homogeneous atmosphere belonging to the ensemble, in spectral bands to which the selected spectral points belong. The weighted sum is used for computing transmittances or radiances in emitting or scattering atmospheres.
Claims11
A machine-based method comprising
- receiving spectra of monochromatic transmittances or radiances computed using a reference line-by-line model applied to a training ensemble of atmospheric conditions defined by vertical profiles of temperature, pressure, and concentration of optically active gases for one or more viewing geometries,
- automatically selecting monochromatic spectral points within a spectral range of the line-by-line model computations,
- automatically determining weights for selected spectral points so that the weighted sum of radiances or transmittances at the selected locations is optimally representative, to within any user-prescribed tolerance of error, of spectrally averaged transmittances or radiances computed from the reference line-by-line model, and
- providing the weights and properties of active gases at the selected spectral points tabulated as a function of pressure and temperature to a transfer model to compute averaged radiances or transmittances for an atmospheric condition and viewing geometry belonging to a domain encompassed by the training ensemble.
Dependencies are inferred from the claim text.