| Autor: |
Zhao, W.J., Wang, G.Q., Cao, W.X., Cui, T.W., Wang, G.F., Ling, J.F., Sun, L., Zhou, W., Sun, Z.H., Xu, Z.T., Hu, S.B. |
| Předmět: |
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| Zdroj: |
International Journal of Remote Sensing; Jun2014, Vol. 35 Issue 11/12, p4252-4274, 23p |
| Abstrakt: |
The Sea-viewing Wide Field-of-view Sensor (SeaWiFS), Moderate Resolution Imaging Spectroradiometer (MODIS), and Medium Resolution Imaging Spectrometer (MERIS) remote-sensing radiometric and chlorophyll-a(chl-a) concentration products for the South China Sea (SCS) from October 2003 to May 2010 were assessed usingin situdata. A strict spatiotemporal match-up method was used to minimize the temporal variability effects of atmosphere and seawater around the measurement site. A comparison of the remote-sensing reflectance (Rrs(λ)) of the three sensors within situvalues from the open waters of the SCS showed that the mean absolute percentage difference varied from 13% to 55% in the 412–560 nm spectral range. Generally, the MERIS radiometric products exhibited higher typical uncertainties and bias than the SeaWiFS and MODIS products. TheRrs(443) toRrs(555/551/560) band ratios of the satellite data were in good agreement within situobservations for these sensors. The SeaWiFS, MODIS, and MERIS chl-aproducts overestimatedin situvalues by 74%, 42%, and 120%, respectively. MODIS retrieval accuracy was better than those of the other sensors, with MERIS performing the worst. When the match-up criteria were relaxed, the assessment results degraded systematically. Therefore, strict spatiotemporal match-up is recommended to minimize the possible influences of small-scale variation in geophysical properties around the measurement site. Coastal and open-sea areas in the SCS should be assessed separately because their biooptical properties are different and the results suggest different atmospheric correction problems. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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