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在遥感观测中,目标辐射信息中包含了背景辐射经过大气散射后进入传感器视场的部分,从而使地物边缘模糊,对比度降低,即邻近效应。要从遥感图像中准确获取目标信息,邻近效应校正是必不可少的环节。根据大气辐射传输模型,利用MODIS气溶胶产品并引入新的邻近效应校正系数对高分一号卫星多光谱遥感影像进行邻近效应校正。结果表明,经过校正的遥感影像对比度增强,清晰度增加,地物信息更丰富。
In the remote sensing observation, the target radiation information contains the part of the background radiation entering the sensor’s field of view after being scattered by the atmosphere, so that the edge of the object is blurred and the contrast is reduced, that is, the proximity effect. To obtain accurate target information from remote sensing images, proximity correction is an indispensable part. According to the model of atmospheric radiative transfer, the MODIS aerosol products were used to calibrate the proximity effect of multi-spectral remote sensing images of high score one satellite by introducing a new proximity correction coefficient. The results show that the corrected remote sensing image has more contrast, more sharpness and more abundant feature information.