ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 40 Issue 5 > 2014,40(5):619-627. DOI:10.7519/j.issn.1000-0526.2014.05.013 Prev Next
Research on Haze Indentification in Beijing Based on NOAA/AVHRR Satellite Data
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Abstract:
Using 2008-2013 NOAA/AVHRR 1B satellite data and weather observation data, preliminary research of haze indentification is carried out by digitizing image color processing technology, frequency distribution figure of apparent reflectance and technology of apparent reflectance threshold of visible light channel. And the distinguish indices were applied in haze monitoring of Beijing and surrounding area. The results show that haze is easily distinguished by the color composition of red, green and blue channels with NOAA/AVHRR bands 1, 2, 1 or bands 4, 2, 1 pattern and the colors of remote sensing images are mainly grey, purple and blue. Generally, it is difficult to distinguish haze from mist only by remote sensing images, but with the help of prior knowledge, surrounding environment information and image color, haze can be identified. Apparent reflectance of the first channel of NOAA/AVHRR 1B can be used as spectral index of haze identification. The apparent reflectance values for haze identification in winter, spring, summer, autumn are 0.15-0.32, 0.15-0.30, 0.14-0.30, 0.14-0.32, respectively. And the verification analysis shows that accuracy of haze identification using these spectral indices is 82％. The color indices and reflectance indices are effectively applied in haze monitoring over Beijing and surrounding area from January to March 2013.
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