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Last Post 01 May 2007 02:53 PM by  anon
output of Flaash
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anon



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01 May 2007 02:53 PM
    Hi, everyone, I use Flaash to do atmospheric correction for MODIS. Now i have a question: the output of flaash is reflectance with unitless. This reflectance is irrandiance(up) over irradiance(down), right? Thanks in advance. Lijian

    MariM



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    01 May 2007 02:53 PM
    The FLAASH reflectance is actually a scaled radiance reflectance that equals the irradiance reflectance in the case of a Lambertian surface. It can be thought of as an "apparent" irradiance reflectance derived from the observed upwelling radiance. This definition is standard in atmospheric correction codes for HSI/MSI imagery (e.g., ATREM, ACORN, ATCOR, HATCH in addition to FLAASH). -mm
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