Journal
ENVIRONMENTAL MONITORING AND ASSESSMENT
Volume 177, Issue 1-4, Pages 563-574Publisher
SPRINGER
DOI: 10.1007/s10661-010-1657-3
Keywords
Total suspended matter; Pearl River estuary; Remote sensing reflectance; MERIS
Categories
Funding
- CUHK [4450188, 2020928]
- GRF [2120344]
- ITF [8118036]
- CAS Key Laboratory of Ocean Circulation and Wave Studies [KLOCAW0809]
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Based on the cruise data collected in the Pearl River estuary (PRE) in May 2008, an empirical two-band model by using the ratio of R (rs) at 629 and 671 nm was established to retrieve total suspended matter (TSM) concentration with the determination coefficient (R-2) of 0.854, mean relative error (MRE) of 7.483%, and root-mean-square error (RMSE) of 1.295 mg L (-aEuro parts per thousand 1). To match with medium resolution imaging spectrometer (MERIS) bands, in situ remote sensing reflectance was re-sampled to the bandwidth of 10 nm. The relationship between TSM and re-sampled R (rs) at 620 nm (MERIS band 6) and 665 nm (MERIS band 7) are obtained (R-2 = 0.748, RMSE = 1.697 mg L (-aEuro parts per thousand 1), MRE = 8.785%, n = 13). Additionally, to map the spatial distribution of TSM in the PRE, MERIS level_1B data were calibrated using a multiple linear regression model based on in situ R (rs). Another dataset collected in the PRE in January 2004 was used to validate the two-band model and also applied to map TSM distribution from MERIS image. The comparison between measured TSM values and modeled ones showed satisfactory results (R-2 = 0.753, MRE = 22.199%, and RMSE = 2.603 mg L (-aEuro parts per thousand 1)).
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