[Retrieval and validation of the surface reflectance using HJ-1-CCD data].

The potentiality of the retrieval of surface reflectance using CCD camera aboard HJ-1A/B satellite was studied.It is very difficult to use dark targets in atmospheric correction due to the lack of near infrared band.The alternative normalized difference vegetation index(NDVI) and the red/blue reflectance ratio are detected from the spectral experiment in Beijing and the Pearl River Delta.Ground-based spectral data including grass,dense vegetation,water body,soil,residential roof and bright building etc.were used to validate the surface reflectance in Beijing,and the relative error in red,blue band is under 38.7% and 37.2% respectively.Uncertainties of the surface reflectance retrievals were analyzed.The comparison of MODIS surface reflectance product showed that there is a good agreement in the dense targets,and the correlation coefficient(R2) in red,blue band is as high as 0.809 4 and 0.723 9 respectively.HJ-1-CCD data can effectively reduce pixel-mixed impact on the cement roof and bright buildings,and the inversion accuracy is higher than MODIS products.