Quantitative estimation of Secchi disk depth using the HJ-1B CCD image and in situ observations in Sishili Bay, China
2014
Secchi disk depth (SDD) is an important optical property of water related to water quality and primary production. The
traditional sampling method is not only time-consuming and labor-intensive but also limited in terms of temporal and
spatial coverage, while remote sensing technology can deal with these limitations. In this study, models estimating SDD
have been proposed based on the regression analysis between the HJ-1 satellite CCD image and synchronous in situ
water quality measurements. The results illustrate the band ratio model of B3/B1 of CCD could be used to estimate
Secchi depth in this region, with the mean relative error (MRE) of 8.6% and root mean square error (RMSE) of 0.1 m,
respectively. This model has been applied to one image of HJ-1 satellite CCD, generating water transparency on June 23,
2009, which will be of immense value for environmental monitoring. In addition, SDD was deeper in offshore waters
than in inshore waters. River runoffs, hydrodynamic environments, and marine aquaculture are the main factors
influencing SDD in this area.
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