Arcachon tutorial: Modeling 2
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Model2_2
#Line_6 Model 2+++++++++++ Model 2+++++++++++ Model 2+++++++++++
nice -20  ./4SM.4.08 -Process/14_Jul_2011/06_JUL_2011  -OriginSPT @@
-DB/arcachon/27_1_0_0/3_1/500_630/0.010_22.610/1_1 @@
-Mis/Arcachon/France/Spot/XS/NA/UTM_1_008/0.020_0.020/1_AUG_1986 @@
-LS/0255.0/255.0/255.0 @@
-M/@000001/00002/00003 @@
-LsM/078.8/071.2/065.2_cLM=0.450 @@
-Lsw/030.4/014.2/008.0 @@
-Lw/0002.5/000.0/000.0 @@
-Lm/0001.0/001.0/255.0 @@
-Z/MSL0.00/cZ1.000 @@
-B/tclNe/LBref200_100/Bmin100/cLM1.00 @@
@Extract/v/mBPL2 @@
@Calibrate/v/BdSNpzg/BDh_12_13 @@
-smooth/5/D/Smart+ @@
@Recode/201_InChannel_9_into_233_OutChannel_4

 B Z is mapped to a maximum of 9.7 m One-band case using LBref Let's enable the "one-band case" for all pixels which have been ousted and have sufficient bottom contrast Lsgreen-Lswgreen>=Lmgreen Change for the following -M0000001/00002/00003 -Lm/0001.0/001.0/255.0 -B/tclNe/Bmin100/LBref130_100/cLM1.00 Find your prefered values for Lmgreen=1.0 : we might want to incerase this value LBref[1]=130 : we might want to increase this value Z is mapped  to a maximum of 9.7 m How does the "one band case" work? Shallow pixels which yield wZ=2 and B<130 are deemed foul in this environment Those which satisfy Ls-Lsw>Lm (bottom contrast) qualify for the "one band case" Depth for the one-band case is computed by Z=(ln(LBref-Lw) - ln(Ls-Lsw))/K Z=(ln(130    -2.5) - ln(Ls-30.4))/0.389 Thresholds must be increased, in order to preclude the most obviously foul water plumes from showing off   Try the following NOW: -Lm/0004.0/002.0/255.0            -B/tclNe/Bmin110/LBref135_100/cLM1.00

Can we trust this result?
• YES for strong radiances Ls
• Kred and Kgreen are quite trustworthy for a SPOT image
• the "exponential decay" is well established
• the "bottom contrast" Ls-Lsw is poorly affected by the uncertainty on Lsw
• NO for weaker radiances Ls: bottom contrast is ,2.0 (see below)
• Deeper than ~2 meters, areas of foul waters populate the output with foul results
• least with a blue band,
• more so with a green band,
• even more so for the red bandand much more so for the NIR band
• This is because of the diffuse properties of the underwater lightfield

Model2_3
Final Modeling
Thresholds must be increased,  in order to preclude
the most obvious remaining foul water plumes from showing off
(some shall still remain though)

Try
• -Lm/0004.0/002.0/255.0
• -B/tclNe/Bmin110/LBref135_100/cLM1.00
Final command line

#Line_7 Model 2+++++++++++ Model 2+++++++++++ Model 2+++++++++++
nice -20  ./4SM.4.08 -Process/14_Jul_2011/06_JUL_2011  -OriginSPT @@
-DB/arcachon/27_1_0_0/3_1/500_630/0.010_22.610/1_1 @@
-Mis/Arcachon/France/Spot/XS/NA/UTM_1_008/0.020_0.020/1_AUG_1986 @@
-LS/0255.0/255.0/255.0 @@
-M/000001/00002/00003 @@
-LsM/078.8/071.2/065.2_cLM=0.450 @@
-Lsw/030.4/014.2/008.0 @@
-Lw/0002.5/000.0/000.0 @@
-Lm/0004.0/002.0/255.0 @@
-Z/MSL0.00/cZ1.000 @@
-B/tclNe/Bmin110/LBref135_100/cLM1.00 @@
@Extract/v/mBPL2 @@
@Calibrate/v/BdSNpzg/BDh_12_13 @@
-Smooth/5/D/Smart+ @@
@Recode/201_InChannel_9_into_233_OutChannel_4

 Final depth Z is mapped to a maximum of 5.7 m FCC Previous B Z is mapped to a maximum of 9.7 m Final B Z is mapped to a maximum of 5.7 m