Pixel-by-pixel reduction of atmospheric haze effects in multispectral digital imagery of water

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Title: Pixel-by-pixel reduction of atmospheric haze effects in multispectral digital imagery of water
Author: Francis, John W.
Abstract: A study is described in which the effects of the atmosphere on a remotely sensed, multispectral image of water are reduced in a spatially varying manner. The near zero IR reflectance of a water body is used to compute the atmospheric path transmittance and atmospheric path radiance on a pixel-by-pixel basis for a LANDSAT-5 Thematic Mapper image of Lake Ontario. TM Band 4 (0.76-0.90um) image radiance measures are used to define the atmospheric path radiance. Radiosonde data and the LOWTRAN 6 atmospheric model are used to compute the equivalent atmospheric effects for the spectral regions corresponding to the visible wavelength Thematic Mapper image bands on a pixel specific basis. The pixel-by-pixel correction technique is shown to provide a useful reduction of atmospheric effects and to significantly reduce the uncertainty in the image derived measurement of water reflectance.
Record URI: http://hdl.handle.net/1850/11359
Date: 1989-03-17

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