TY - JOUR
T1 - Chi-square spectral fitting for concentration retrieval, automatic local calibration, quality control, and water type detection
AU - Hommersom, A.
AU - Peters, S.W.M.
AU - van der Woerd, H.J.
AU - Eleveld, M.A.
AU - de Boer, J.
PY - 2011
Y1 - 2011
N2 - In this study, the inverse bio-optical model HYDROPT was calibrated with regional specific inherent optical properties (SIOPs) and various local SIOPs to examine the effect of these calibrations on the retrievals. The study area, the Wadden Sea, is an estuary and tidal flat area with very high concentrations of chlorophyll a (Chl a), suspended particulate matter (SPM), and coloured dissolved organic matter (CDOM). HYDROPT could derive concentrations of Chl a, SPM, and CDOM with a reasonable degree of accuracy when in situ above-water reflectances were used as input (root mean squared error of 0.19-0.52 mg?m23 for Chl a, 0.28-0.46 mg?m23 for SPM, and 0.20-0.34 m21 for aCDOM). However, quality control showed that 70% of the in situ input reflectance spectra were ambiguous; these spectra could be modelled with various sets of SIOPs. Therefore, automatic local calibration based on the spectral fit (x
AB - In this study, the inverse bio-optical model HYDROPT was calibrated with regional specific inherent optical properties (SIOPs) and various local SIOPs to examine the effect of these calibrations on the retrievals. The study area, the Wadden Sea, is an estuary and tidal flat area with very high concentrations of chlorophyll a (Chl a), suspended particulate matter (SPM), and coloured dissolved organic matter (CDOM). HYDROPT could derive concentrations of Chl a, SPM, and CDOM with a reasonable degree of accuracy when in situ above-water reflectances were used as input (root mean squared error of 0.19-0.52 mg?m23 for Chl a, 0.28-0.46 mg?m23 for SPM, and 0.20-0.34 m21 for aCDOM). However, quality control showed that 70% of the in situ input reflectance spectra were ambiguous; these spectra could be modelled with various sets of SIOPs. Therefore, automatic local calibration based on the spectral fit (x
U2 - 10.5589/m11-004
DO - 10.5589/m11-004
M3 - Article
VL - 36
SP - 650
EP - 670
JO - Canadian Journal of Remote Sensing
JF - Canadian Journal of Remote Sensing
SN - 0703-8992
IS - 6
ER -
