Optical calibration, bathymetry, water column correction and bottom typing of shallow marine areas, using passive remote sensing imageries

Bathymetry and water column corection
A 1500*2100 series of Landsat ETM/TM  4-bands images

of Ras Hatibah, Saudi Arabia

work done in march 2010

 ETM_2000-11-01 TCC ETM_2000-11-01 FCC rashatibahCZ11.pix: Channel 16 Final averaged depth in decimeters Average Depth for each shallow pixel:   Average (N=11): 11 depths in decimeters are averaged  Standard deviation (N=11) is also computed   images which yield depth outside Average+/-STD are rejected ==> N images survive Channel_16: Final average depth is written  Channel_15: Final standard deviation is written  Channel_14: Final N is written ==Two champions== 7 ZCombiner: 14.4 percents of shallow pixels of image ETM_2003-01-10 are rejected while averaging depth 2 ZCombiner: 15.5 percents of shallow pixels of image ETM_1999-11-15 are rejected while averaging depth rashatibahCZ11.pix: Channel 15 Standard deviation  on final averaged depth  in decimeters rashatibahCZ11.pix: Channel 14 N on final averaged depth Maximum Depth rashatibahCZ11.pix: Channel 13 Deepest depth over 11 images in decimeters Maximum Depth rashatibahCZ11.pix: Channel 12 Shows which image is deepest 2 - blue for ETM_1999-11-15 11 - purple for TM_1990-11-06 ... TM at Ras Hatibah TM at Ras Hatibah K[blue]/K[green]=0.55 Calibration using Mid waveband WL[blue  ]=485.0 nm at mid waveband  WL[green]=569.5 nm at mid waveband  WL[red   ]=658.5 nm at mid waveband  is not acceptable as seen in the plot of X[1_2] vs X[3]  This yields  ZM[blue  ]=45.6 m ZM[green]=25.2 m ZM[red   ]=  7.2 m option A One way to alleviate the problem is: keep WL[green]=569.5 nm at mid waveband  relocate WL[red] at 624.7 nm This yields ZM[blue  ]=45.6 m ZM[green]=25.2 m ZM[red   ]=  9.1  m All Ras Hatibah ETM and TM images  were processed using this way: this yields depths  1.4 times deeper than option B We'll see then!! option B Another way to alleviate the problem is: relocate WL[green] at 578.4 nm  keep WL[red] at 658.5 nm at mid waveband   This yields ZM[blue  ]=33.3 m ZM[green]=18.4 m ZM[red   ]=  6.9 m All Tanzania TM and ETM images were processed using this way, with the result that depths were underestimated by a factor of 1.5! The same is observed with ETM images The same is observed with ETM images
.
.
.
.