Using the Panchromatic band for water column correction to derive water depth and spectral bottom signature: Landsat 8 OLIP bandset used for this work Purple=1, Blue=2, Green=3, PAN=4, Red=5, NIR=6 and SWIR1=7 |
![]() Calibration diagram for the whole scene for bands Blue, Green, Red and NIR KCOASTAL/KBLUE=0.52 | ![]() Calibration diagram for the whole scene for bands Coastal, PAN, Red, NIR |
![]() BOA TCC: water column corrected | ![]() Retrieved depth see legend |
![]() SAM classified image see legend for SAM | ![]() Average bottom brightness it seems that most of the image require the ratio Kblue/Kgreen to be set much higher than 0.52 as shown below in the LUT results |
![]() UltraBlue band, 440 nm, BOA deglinted
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![]() Green band, 560 nm, BOA deglinted
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Retrieved ratio Kblue/Kgreen see legend ![]() Map of the ratio Kblue/Kgreen It may be seen that these expansive shallow waters are extremely heterogeneous, ranging
| Retrieved bottom reflectance LB ![]() TCC BOA water column corrected (1-3-2) Darker areas denote a distinctly green/dark spectrum (seagrass beds). The largest patch of seagrass is badly accounted for Rosy areas denote an excess of UltraBlue radiance |
Retrieved_LUT_depth see legend ![]() view Combined depth | Combined_depth-Lut_depth see legend Blue tones report over-estimated depths ![]() |
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