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 |
![]() TOA TCC: raw image Black Holes of the Bahamas | ![]() TOA TCC Black hole is approx 2 km in diameter On this TOA TCC (logaritmic enhancenent), compared to open waters nearby, black hole exhibits
like if black ground water were seeping from aquifer beneath |
Artifact ===>>> Green-Purple tones cover the range of reflectance less than 30% of that of coral sand. The extent of Green-Purple tones gives a measure of the extent of discoloured waters. | ![]() |
![]() Calibration diagram for the whole scene for bands Blue, Green, Red and NIR | ![]() 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 |