Modified DDV method of aerosol optical depth inversion over land surfaces from CBERS02B
CBERS02B卫星CCD传感器数据反演陆地气溶胶

In this paper, the retrieval of AOD (aerosol optical depth) over land surfaces from CCD (Charge Coupled Device) data of CBERS (China Brazil Earth Resources Satellite) 02B was studied. The inversive method is modified DDV (dark dense vegetation) algorithm: (1) based on the spectral data of vegetation and the characteristics of the CCD sensor, the relationship between blue and red band surface reflectances and the NDVI (Normalized Difference Vegetation Index) thresholds for dense vegetation (dark pixel) were worked out, and the atmospheric effect and its correction were also analyzed. (2) The LUT (look up table) for different bands was pre-computed using the 6S atmospheric radiative transfer code. (3) The AODs was retrieved through interpolating in LUT in accordance with radiances obtained by CCD, and the errors of this modified DDV method was also analyzed and discussed. Finally, the modified DDV method was successfully applied to Nanning and Beijing areas. The comparison of the retrieved AODs with those of MODIS shows a good agreement.