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Waste Water Evaluation and Management Part 7

Tham khảo tài liệu 'waste water evaluation and management part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Satellite Monitoring and Mathematical Modelling of Deep Runoff Turbulent Jets in Coastal Water Areas 169 Fig. 6. Propagation areas for anomalies caused by the deep outfall in Mamala Bay Hawaii detected in optical a and radar b satellite images for different days under various hydrometeorological conditions 5.5 Anomalies of hydrooptical characteristics detected using high resolution satellite imagery and sea truth data The processing of high resolution 2.4 m multispectral images was carried out using the characteristics of relative signal variety in red R green G and blue B spectral bands of 60 -80 nm width. The processing technique used the following basic procedures Bondur 2004 Bondur Zubkov 2005 synthesizing the colour image from separate bands RGB-synthesis interpreting imagery to mark out clouds ships and their traces land and unclouded marine surface selecting fragments of the full scene of an image for the area of interest for further processing filtering decorrelation stretch to remove correlation of spectral bands parametric and non-parametric classification combination of classes colour coding. To correct brightness image distortions caused non-uniform sensitivity of the CCD camera additional procedures consisting in removing brightness transversal trend within each fragment and brightness band interleveling based on statistic parameter use. To verify the results of multispectral satellite imagery processing in the studied area sea truth measurements were carried out using AC-9 hydrooptical equipment and various hydrophysical equipment at the moments of time close to satellite imaging time Gibson et al. 2006 Bondur et al. 2006a 2007 The gauge was deployed from the Klaus Wyrtki ship down to a depth of 150 m. Values of absorption factor and attenuation were measured using AC-9 equipment at nine wavelengths in 412 to 715 nm spectral band at each station B6 located in the area of the outfall. Vertical profiles of these values were created for each station .