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利用LANDSAT-5的专题制图仪(TM)对中巴地球资源卫星(CBERS)-02的CCD1～4波段进行交叉定标,得到了CCD1～4波段的参考定标系数。利用该定标系数并应用气象数据和ATCOR3软件对CBERS-02的CCD数据进行大气校正;对比大气修正前后图像的清晰度和归一化的植被指数。结果表明,大气校正增强了图像的对比度,归一化植被指数(NDVI)的均值明显提高,增大了高植被覆盖区与低植被覆盖区NDVI的差别,植被信息更加突出。对于山区崎岖地表状况下,大气校正后,山体的棱角分明,轮廓清晰可见,还原了下垫面的原貌,有利于遥感信息的提取。
Using LANDSAT-5’s thematic plotter (TM) to cross-calibrate CCD1 ~ 4 bands of China Earth-Pakistani Earth Resources Satellite (CBERS) -02, the reference calibration coefficients of CCD1 ~ 4 bands were obtained. Atmospheric correction was performed on CCD data of CBERS-02 by using the calibration coefficient and the weather data and ATCOR3 software. The sharpness of the image before and after atmospheric correction and the normalized vegetation index were compared. The results show that the atmospheric correction enhances the contrast of the images. The average normalized NDVI increases obviously, which increases the difference of NDVI between high and low vegetation cover, and the vegetation information is more prominent. For the rugged terrain in the mountainous area, after the atmospheric correction, the edges and corners of the mountain are clear, the outline is clearly visible, and the original appearance of the underlying surface is restored, which is good for the extraction of remote sensing information.