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DETERMINE CONCENTRATIONS OF NITROGEN AND PHOSPHORUS IN ESTUARY WITH SATELLITE IMAGE
Author(s): 
Pages: 1486-1492
Year: Issue:  6
Journal: Oceanologia et Limnologia Sinica

Keyword:  DIN concentrationDIP concentrationSheyang River estuaryBeijing-1 Micro-satelliteremote sensing;
Abstract: Using in-situ measured spectrum, we simulated the reflectance of multi-spectral image taken by satellite Beijing-1 and calculated the correlations between simulated reflectance and concentrations of dissolved inorganic nitrogen(DIN) and dissolved inorganic phosphorus(DIP) in Sheyang River estuary in northern Jiangsu Province, Yellow Sea, East China. Results show that near-infrared and red bands have greater positive correlations with DIN and DIP concentrations than that of green band, indicating that resuspended sediment is an important source of nutrients in the estuary. Multi-band factors are more closely correlated with DIN and DIP concentrations than single band factors do, which is caused mostly by the difference or ratio of near-infrared and green bands. After comparing R2 and relative accuracy, the cubic models established by F10(3, 1) factor are chosen to retrieve DIN and DIP concentrations. The value R2 of DIN and DIP models arrive at 0.645 and 0.730, respectively. The accuracy of the models under relatively high concentration conditions(DIN≥200μg/L, DIP≥20μg/L, which are well below the average value in this area) arrive at 73.69% and 73.45%. The retrieved results are well consistent with the real conditions and errors between the retrieved results and in-situ data are lower than errors of whole sample set. The model therefore, was proved effective.
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