Model2_1 |
| Copy Line 4 into Line 5
#Line_4 Calibration 2+++++++++++Calibration 2+++++++++++Calibration 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/0001.5/000.0/000.0 @@
-Lw/0002.5/000.0/000.0 @@
-Lm/0001.0/001.0/001.0 @@
-KK1_2_0.420/Knir4.500/mask_1 @@
-Z/MSL0.00/cZ1.000 @@
-B/tclNe/LBref200_100/Bmin0/cLM1.00 0.70 @@
-Extract/v/mBPL2 @@
@Extract/v/RawBDH/NIRband3/NIRmax5.0/FullBDH/mSOIL21/mBPL2 @@
-Calibrate/v/BdSNpzg/BDh_12_13 @@
-Model/mask_2 @@
-smooth/5/D/Smart+ @@
@Recode/201_InChannel_9_into_233_OutChannel_4
|
|
#Line_5 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/0001.5/000.0/000.0 @@
-Lw/0002.5/000.0/000.0 @@
-Lm/0001.0/001.0/001.0 @@
-KK1_2_0.420/Knir4.500/mask_1 @@
-Z/MSL0.00/cZ1.000 @@
-B/tclNe/LBref200_100/Bmin0/cLM1.00 0.70 @@
@Extract/v/mBPL2 @@
@Extract/v/RawBDH/NIRband3/NIRmax5.0/FullBDH/mSOIL21/mBPL2 @@
@Calibrate/v/BdSNpzg/BDh_12_13 @@
-Model/mask_2 @@
-smooth/5/D/Smart+ @@
@Recode/201_InChannel_9_into_233_OutChannel_4
- Disable @Extract.... argument
- Disable -Calibrate... argument
|
| Run the command line script
shallow pixels are modeled by the Red solution Note - -Lm/0001.0/001.0/255.0 :
- very low thresholds for the green and red bands
- very high threshold for the NIR band
- prevent any depth to be computed using the NIR solution
- ?-M@000001/00002/00003 : shallow pixels are modeled by the Red solution
|
Unacceptable Average bottom brightness results are not acceptable
|
B average bottom brightness -Lm/0001.0/001.0/255.0 - As the Lm thresholds are very low, bottom brightness is seen to get darker as the depth increases
- this is not acceptable in a "all sand" highly dynamic environment
- Increasing from Lswred=14.2 to Lswred=15.2
- would be more representative of the waters in the main channel
- would not solve any of our problems though
- Try it NOW, see for yourself
| 
wZ - Brown:......land pixels are coded at 248
- Blue:.........deep water pixels
- Cyan:........wave breaker pixels are coded at 233
- Green:......all other shallow pixels
- modeled using the Red solution
| 
| Bmin We can impose a minimum average brightness B - Let's raise the threshold on average bottom brightness from Bmin=10 to Bmin=100
- -Lm/0001.0/001.0/255.0
- -M@000001/00002/00003
- -B/tclNe/Bmin100/cLM1.00
- Find your preferred value for Bmin
Quite neat!
- On display now is B>=100 results
- as B<100 results have been ruled out
The image below provides the explanation
|
How threshold Bmin works
- Left: the image is a false color composite of linearized data
- ?with overlay of a red shapefile
- Right: this plot of linearized Green vs Red pixels under the red shapefile shows
- a neat and curved Soil Line :
- the water volume reflectance Lswgreen cannot be ignored :
- its value must be set so that the Soil Line model model fits the Soil Line pixels
- failing that, authors report that computed depth over dark bottoms are badly under-estimated
- a fairly neat and linear Brightest Pixels Line
- the scatter of foul water pixels plot below the red Bmin line
- How Bmin works :
- pixels that plot below the red Bmin line shall
- either be mapped as deep water (see above)
- or processed with the "one-band case" (see below)
|
