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| Titel |
Remote sensing of aerosols and atmospheric correction of HJ-1 CCD data over urban areas |
| VerfasserIn |
L. Fang, T. Yu, X. Gu |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250059070
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| Zusammenfassung |
| Satellite aerosol retrieval over urban areas remains a difficult task due to heterogeneity and
high reflectance of the urban ground surface. Compared to most moderate/low resolution
satellite sensors for aerosol detection, the high spatial resolution of HJ-1 CCD camera (30 m)
enables larger opportunities to find spectrally pure pixels over urban areas. In this study,
we developed a SPP (spectrally pure pixels) algorithm for urban aerosol optical
depth (AOD) retrieval using HJ-1 CCD data. Pixel Purity Index (PPI) is used to
identify the pure pixels on the image. The surface reflectances of the pure pixels
are estimated from the multi-temporal CCD measurements of HJ-1A and HJ-1B
platforms based on surface BRDF model. Then the aerosol optical depth can be derived
from satellite radiation. The comparison with ground-based AERONET (AErosol
RObotic NETwork) AOD measurements shows good performance of our algorithm.
A significant (R=0.84) is obtained with a linear regression slope close to 1 and,
however, a relatively large intercept of ~0.057. With the retrieved AOD as input, the
atmospheric correction of HJ-1CCD data over urban areas is largely improved. |
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