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| Titel |
Determination of land surface reflectance using the AATSR dual-view capability |
| VerfasserIn |
L. Sogacheva, P. Kolmonen, T. H. Virtanen, E. Rodríguez, A.-M. Sundström, G. de Leeuw |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 8, no. 2 ; Nr. 8, no. 2 (2015-02-22), S.891-906 |
| Datensatznummer |
250116142
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| Publikation (Nr.) |
 copernicus.org/amt-8-891-2015.pdf |
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| Zusammenfassung |
In this study, a method is presented to retrieve the surface reflectance
using the radiances measured at the top of the atmosphere for the two views
provided by the Advanced Along-Track Scanning Radiometer (AATSR). In the first step,
the aerosol optical depth (AOD) is obtained using the AATSR dual-view
algorithm (ADV) by eliminating the effect of the surface on the measured
radiances. Hence the AOD is independent of surface properties and can thus
be used in the second step to provide the aerosol part of the atmospheric
correction which is needed for the surface reflectance retrieval. The method
is applied to provide monthly maps of both AOD and surface reflectance at
two wavelengths (555 and 659 nm) for the whole year of 2007.
The results are validated versus surface reflectance provided by the
AERONET-based Surface Reflectance Validation Network (ASRVN). Correlation
coefficients are 0.8 and 0.9 for 555 and 659 nm, respectively. The standard
deviation is 0.001 for both wavelengths and the absolute error is less than
0.02. Pixel-by-pixel comparison with MODIS (Moderate Resolution Imaging
Spectrometer) monthly averaged surface reflectances show a good correlation
(0.91 and 0.89 for 555 and 659 nm, respectively) with somewhat higher values
(up to 0.05) obtained by ADV over bright surfaces. The difference between
the ADV- and MODIS-retrieved surface reflectances is smaller than ±0.025
for 68.3% of the collocated pixels at 555 nm and 79.9% of the
collocated pixels at 659 nm. An application of the results over Australia
illustrates the variation in the surface reflectances for different land
cover types.
The validation and comparison results suggest that the algorithm can be
successfully used for both the AATSR and ATSR-2 (which has characteristics
similar to AATSR) missions, which together cover a 17-year period of
measurements (1995–2012), as well as a prototype for the Sea and Land
Surface Temperature Radiometer (SLSTR) planned to be launched in the fall
of 2015 onboard the Sentinel-3 satellite. |
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