Title :
A synergetic approach for the retrieval of aerosol optical thickness from both AATSR data and MODIS BRDF data over Land
Author :
Guo, JianPing ; Xue, Yong ; Guang, Jie ; Luo, Ying ; Wan, Wei ; Bai, Linyan ; Zheng, Lei ; Wei, Wei
Author_Institution :
Chinese Acad. of Sci., Beijing
Abstract :
As is known that multi-angle sensor can provide more information to characterize the angular spectral reflectance, which is important for the inversion of most geophysical parameters, including aerosol optical thickness (AOT). In this paper, a synergetic approach for simultaneous retrieval of AOT over land at a 1 km spatial resolution for 0.55, 0.66 and 0.87 mum from Advanced Along-Track Scanning Radiometer (AATSR) TOA radiance is presented which exploits the synergy of AATSR dual-angle view capabilities and semi-empirical linear kernel-driven bi-directional reflectance distribution function (BRDF) model product from NASA. In this approach, the BRDF characteristics of land surface are used to retrieve AOT by combining the geometrical information extracted from AATSR and linear kernel-driven BRDF parameter product. No assumptions are required about the land surface spectral properties, thus allowing for quantitative retrieval of aerosol particles over virtually arbitrary land surface. A retrieval example is given by validating against AERONET Beijing in-situ AOT measurements with the maximum standard deviation of 0.06, which suggests that the retrieval precision of AOT be favorable by accounting for BRDF effects through this synergetic approach developed in this paper.
Keywords :
aerosols; atmospheric optics; atmospheric spectra; atmospheric techniques; data acquisition; optical variables measurement; radiometry; remote sensing; AATSR data; Advanced Along-Track Scanning Radiometer; MODIS BRDF data; aerosol optical thickness retrieval; aerosol particles; angular spectral reflectance; dualangle view capability; geometrical information; land surface characteristics; land surface spectral properties; multiangle sensor; semiempirical linear kernel-driven bidirectional reflectance distribution function; synergetic approach; Aerosols; Bidirectional control; Information retrieval; Land surface; MODIS; Optical sensors; Radiometry; Reflectivity; Sensor phenomena and characterization; Spatial resolution; AATSR; AERONET; AOT BRDF;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 2007. IGARSS 2007. IEEE International
Conference_Location :
Barcelona
Print_ISBN :
978-1-4244-1211-2
Electronic_ISBN :
978-1-4244-1212-9
DOI :
10.1109/IGARSS.2007.4423796