A simple atmospheric correction method for satellite imagery.

Dark Object Subtraction is a simple empirical atmospheric correction method for satellite imagery available in ENVI which assumes that reflectance from dark objects includes a substantial component of atmospheric scattering. Dark object subtraction searches each band for the darkest pixel value. The scattering is removed by subtracting this value from every pixel in the band. This simple technique is effective for haze correction in multispectral data, but it should not be used for hyperspectral data.

References: Landsat data processing (in ENVI) SPEAR Atmospheric Correction