Estimating Water Optical Properties.ppt
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This document summarizes a study that used a spectral matching algorithm to estimate water optical properties, water depth, and bottom albedo from a WorldView-2 satellite image of coastal waters in Singapore. The algorithm fitted pixel reflectance spectra to a shallow water reflectance model to derive parameters like water depth, bottom composition, and detect submerged vegetation. Estimates of water depth, bottom albedo, and a vegetation index were produced and helped map different coastal habitats beneath the water surface.
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Thomas Fickenscher3
Andrew Wixted1,2
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University
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Queensland Academy of Sport
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- 2. WorldView-2 High resolution with 8 spectral bands Launched: 8 October 2009 0.46 m panchromatic 1.84 m multispectral 8 spectral bands: Band 1: 429.3 nm (47.3) “Coastal” Band 2: 478.8 nm (54.3) Blue Band 3: 547.5 nm (63.0) Green Band 4: 607.8 nm (37.4) Yellow Band 5: 658.5 nm (57.4) Red Band 6: 723.5 nm (39.3) “Red edge” Band 7: 825.0 nm (98.9) NIR1 Band 8: 919.4 nm (99.6) NIR2 Effective wavelength Bandwidth
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- 8. Seagrass
- 9. Coral rubble with algae/seagrass/coral
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- 15. Band 7 (NIR1) after subtracting Band 8 More homogeneous surface
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- 21. Sea bottom reflectance Sea bottom reflectance is modeled as a linear combination of typical sand and vegetation reflectance spectra. (Sea bottom NDVI, corrected for water column effects) vegetation sand
- 22. Example of spectral matching: Deep water Class 3: Deep water X = 0.25 m -1 , G = 0.096 m -1 P = 0 Water depth set to a large value H = 25 m during spectral fitting (actual value doesn’t matter)
- 23. Example of spectral matching: Reef edge Class 6: Fringe of coral reef X = 0.23 m -1 , G = 0.019 m -1 P = 0 Rb547 = 0.135, Rb659 = 0.154, Rb825 = 0.282, NDVI = 0.292 H = 1.30 m
- 24. Example of spectral matching: Submerged reef Class 41: shallow reef X = 0.26 m -1 , G = 0.0 m -1 P = 0.25 m -1 Rb547 = 0.226, Rb659 = 0.267 , Rb825 = 0.365, NDVI = 0.154 H = 0.31 m
- 25. Example of spectral matching: Submerged seagrass Class 25: submerged seagrass X = 3.21 m -1 , G = 0.0 m -1 P = 0 m -1 Rb547 = 0.024, Rb659 = 0.020, Rb825 = 0.155, NDVI = 0.776 H = 0.12 m
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- 27. Bottom Albedo (at 547 nm) 0 0.10 0.20 > 0.30
- 28. Vegetation Index (Water column corrected) 1.0 0.50 0.0 Detection of submerged aquatic vegetation