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| Monitoring of aerosol optical depth over land surface using CCD camera on HJ-1 satellite. |
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Abstract The potentiality of the retrieval of aerosol optic depth over land using CCD camera aboard on HJ-1A/B satellite was studied. It is very difficult to use CCD data to retrieve aerosol optic depth due to the lack of near infrared band. By using the normalized difference vegetation index (NDVI) to search for the dark pixel, a modified dark dense vegetation (DDV) method was developed to retrieve the aerosol optical depth (AOD) from CCD data. Firstly, the CCD images was re-sampled and calibrated, and then the AOD was derived using a look up table (LUT) which was built based on “6S”with the features of HJ-1 CCD taken into account. The retrieved AODs were validated using ground-based observation by a CE318 sunphotometer and compared with the MODIS aerosol products. The retrieved AODs from HJ-1 CCD was in a good agreement with the MODIS AOD products when the AOD was larger than 0.2. Finally, the AOD thematic maps was obtained after smoothing AOD image.
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Received: 24 February 2009
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