
Proceedings Paper
Improved MODIS aerosol retrieval using modified VIS/MIR surface albedo ratio over urban scenesFormat | Member Price | Non-Member Price |
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Paper Abstract
In this paper, we focus on the use of simultaneous MODIS and AERONET sky radiometer data to refine
the surface albedo models regionally and improve on the current AOD operational retrieval. In particular,
over New York City, we show that the correlation coefficient assumption used in the MODIS Collection
(5) model between the VIS and MIR channels used for surface reflection parameterization are still severely
underestimated in comparison with high spatial imagery data from Hyperion thereby leading to an
underestimate in the VIS ground albedos and explaining the subsequent overestimate of the VIS optical
depth. Furthermore, we find that the VIS/MIR ratios depend only weakly on the scattering geometry
allowing us to generate a regional VIS/MIR surface reflectance correlation coefficient map at spatial
resolutions down to 1.5km. When applying the new VIS/MIR surface reflectance ratio model, we show the
MODIS and AERONET derived optical thickness agreement is significantly improved for the operational
10km resolution product. Moreover, we also show the high resolution surface model allows us to improve
the resolution of the retrieved AOD to 3km. Although direct comparisons for a given day can only be made
at the AERONET site, we find the AOD spatial variability from the improved MODIS retrievals is in far
better agreement with temporal statistics seen in the AERONET time series retrievals. In addition to that,
we also process and validate with another urban area, Mexico City, and the result is also significantly
improved by using refined regional VIS/MIR surface reflectance ratio model.
Paper Details
Date Published: 13 October 2008
PDF: 12 pages
Proc. SPIE 7107, Remote Sensing of Clouds and the Atmosphere XIII, 71070W (13 October 2008); doi: 10.1117/12.800388
Published in SPIE Proceedings Vol. 7107:
Remote Sensing of Clouds and the Atmosphere XIII
Richard H. Picard; Adolfo Comeron; Klaus Schäfer; Aldo Amodeo; Michiel van Weele, Editor(s)
PDF: 12 pages
Proc. SPIE 7107, Remote Sensing of Clouds and the Atmosphere XIII, 71070W (13 October 2008); doi: 10.1117/12.800388
Show Author Affiliations
Ana Picon, City College, CUNY (United States)
Min M. Oo, City College, CUNY (United States)
Eduardo Hernandez, City College, CUNY (United States)
Matthias Jerg, City College, CUNY (United States)
Min M. Oo, City College, CUNY (United States)
Eduardo Hernandez, City College, CUNY (United States)
Matthias Jerg, City College, CUNY (United States)
Barry M. Gross, City College, CUNY (United States)
Fred Moshary, City College, CUNY (United States)
Samir A. Ahmed, City College, CUNY (United States)
Fred Moshary, City College, CUNY (United States)
Samir A. Ahmed, City College, CUNY (United States)
Published in SPIE Proceedings Vol. 7107:
Remote Sensing of Clouds and the Atmosphere XIII
Richard H. Picard; Adolfo Comeron; Klaus Schäfer; Aldo Amodeo; Michiel van Weele, Editor(s)
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