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Last Post 03 Aug 2008 05:37 PM by  anon
FLAASH and smoke haze artifact
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anon



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03 Aug 2008 05:37 PM
    I have used FLAASH to atmospherically correct an Ikonos image. The image had forest fire smoke haze which I was content to leave in the image - as it was in the top right corner (out of the way). However I seem to have an artefact in the ex-FLAASH image that looks like smoke haze right across the middle of the output image. The artefact is a line with a sharp edge running width ways, halfway up the image and it "feathers" out for a distance (perhaps1/20th of the image). Is leaving smoke in one part create this artefact? regards Michael Hewson, University of Queensland

    MariM



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    27 Aug 2008 08:18 AM
    I don't think this kind of artifact would be caused by the smoke.  It sounds more like a line caused by tiling.  When the input images are large, it becomes necessary to tile them when processing.  If the atmosphere is significantly different enough in different parts of the image, then you can get different reflectance results returned for these areas based on what was calculated within a tile.  You might try increasing the tile size, or reduce the dimensions of the input image.
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