Atmospheric Correction Of Landsat-8 Remote Sensing Image

In the earth observation process of the satellite-borne sensor, the atmospheric interference significantly reduces its image quality. In visible light waveband, the impact caused by the atmospheric interference is more serious. To eliminate the influence of the atmospheric interference and then to maximally retrieve the ground surface reflectance is an important content of improving the remote sensing images quality. In this paper, a kind of Atmospheric Correction based on Normalized Spectrum is used (ACNS). This atmospheric correction methods entirely in accordance with the images own metadata information. It doesn't depend on other external data, such as digital terrain models, atmospheric measured parameters.The images of Landsat-8 OLI sensor waveband are selected to conduct the atmospheric correction experiment. Firstly, we need retrieve the images'ground surface reflectance of each waveband from 1 to 7 by radiation transfer equation, then build a ground surface normalized spectral space based on the surface reflectance of 6 and 7 wavebands, finally, correct the surface reflectance errors of wavebands from 2 to 4 according to the position of each pixel in the normalized spectral space. After the final comparison and inspection, visual effects have been significantly improved, especially in the mountainous areas of the correction results significantly. In the OLI 2 band, the image error is less than 20%, and the error of OLI 3 and 4 band is less than 10%. Compared with FLAASH model, the surface reflectance of visible light waveband corrected through ACNS has a higher accuracy.The result of ACNS atmospheric correction is the surface reflectance measured in the direction of satellite observation, and it contains terrain factor, ground object BRDF characteristic factor and mixed pixel each ground object proportion factor. This method is suitable for atmospheric correction of panoramic image, and it can automatically adapt to the changes of ground object and ground object BRDF characteristic factor. By this method, the correction accuracy of rugged terrain is close to that of flat region.