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| Titel |
A statistics-based temporal filter algorithm to map spatiotemporally continuous shortwave albedo from MODIS data |
| VerfasserIn |
N. F. Liu, Q. Liu, L. Z. Wang, S. L. Liang, J. G. Wen, Y. Qu, S. H. Liu |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 17, no. 6 ; Nr. 17, no. 6 (2013-06-05), S.2121-2129 |
| Datensatznummer |
250018893
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| Publikation (Nr.) |
 copernicus.org/hess-17-2121-2013.pdf |
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| Zusammenfassung |
| Land-surface albedo plays a critical role in the earth's radiant energy
budget studies. Satellite remote sensing provides an effective approach to
acquire regional and global albedo observations. Owing to cloud coverage,
seasonal snow and sensor malfunctions, spatiotemporally continuous albedo
datasets are often inaccessible. The Global LAnd Surface Satellite (GLASS)
project aims at providing a suite of key land surface parameter datasets with
high temporal resolution and high accuracy for a global change study. The
GLASS preliminary albedo datasets are global daily land-surface albedo
generated by an angular bin algorithm (Qu et al., 2013). Like other products,
the GLASS preliminary albedo datasets are affected by large areas of missing
data; beside, sharp fluctuations exist in the time series of the GLASS
preliminary albedo due to data noise and algorithm uncertainties. Based on
the Bayesian theory, a statistics-based temporal filter (STF) algorithm is
proposed in this paper to fill data gaps, smooth albedo time series, and
generate the GLASS final albedo product. The results of the STF algorithm are
smooth and gapless albedo time series, with uncertainty estimations. The
performance of the STF method was tested on one tile (H25V05) and three
ground stations. Results show that the STF method has greatly improved the
integrity and smoothness of the GLASS final albedo product. Seasonal trends
in albedo are well depicted by the GLASS final albedo product. Compared with
MODerate resolution Imaging Spectroradiometer (MODIS) product, the GLASS
final albedo product has a higher temporal resolution and more
competence in capturing the surface albedo variations. It is recommended that
the quality flag should be always checked before using the GLASS final albedo
product. |
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