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    • 2. 发明授权
    • Methods for atmospheric correction of solar-wavelength hyperspectral imagery over land
    • 太平洋波长高光谱图在陆地大气校正方法
    • US07337065B2
    • 2008-02-26
    • US09767539
    • 2001-01-23
    • Steven M. Adler-GoldenMichael MatthewAlexander BerkLawrence S. BernsteinGail Anderson
    • Steven M. Adler-GoldenMichael MatthewAlexander BerkLawrence S. BernsteinGail Anderson
    • G01W1/00
    • G06K9/0063G06T5/50G06T2207/10036G06T2207/30181
    • This invention discloses several improved methods of correcting for atmospheric effects on a remote image of the Earth's surface taken from above, wherein the image comprises a number of simultaneously acquired images of the same scene, each including a large number of pixels, each at a different wavelength band, and including infrared through ultraviolet wavelengths. One method is for retrieving the aerosol/haze amount (i.e., visible range) from an assumed ratio of in-band reflectances, rather than from an assumed reflectance value. Another method is for identifying cloud-containing pixels. This is used to improve the calculation of the spatially averaged radiance L*e and reflectance ρe images in standard equations. Another method greatly reduces the number of mathematical operations required to generate the reflectance values. This method operates by averaging the water vapor and ρe values over small groups of neighboring pixels, so that the same A, B, S, L*a parameter values may also be assigned to all pixels within the group. Yet another new method accounts for shifts in the wavelength calibration within the image, such as would be caused by spectral “smile”. This method loops the calculation of A, B, S and L*a over a set of possible wavelength shifts with respect to the input channel centers, and assigns the appropriate set of parameters to each pixel based on a pixel-location-dependent formula for the wavelength shift.
    • 本发明公开了一种用于校正从上方获取的对地球表面的远程图像的大气影响的几种改进方法,其中图像包括多个相同场景的同时获取的图像,每个图像包括大量像素,每个像素具有不同的像素 波长带,并包括通过紫外线波长的红外线。 一种方法是从假设的带内反射比率而不是假定的反射率值来检索气溶胶/雾度量(即,可视范围)。 另一种方法是识别含云像素。 这用于改进标准方程式中的空间平均辐射度L * E和反射率的影像的计算。 另一种方法大大减少了生成反射率值所需的数学运算的数量。 该方法通过在小的相邻像素组上平均水蒸汽和低温值来进行操作,使得相同的A,B,S,L * A参数值也可以 分配给组内的所有像素。 另一种新的方法考虑了图像内的波长校准的偏移,例如由光谱“微笑”引起的。 该方法使A,B,S和L * A的计算相对于输入信道中心在一组可能的波长移位中循环,并且基于一个 用于波长偏移的像素位置相关公式。