home image acquired on August 13th 2019
The data  
TCC TOA |  
TCC TOA deglinted, no smoothing |
Glint regressions, based on SWIR band - quite low level of glint/haze
- R2 values are acceptable
- Deglinting is far from perfect
|  
PAN BOA deglinted - the atmosphere is thick and homogeneous
- water volume reflectance is near null everywhere
|
 
UltraBlue BOA deglinted - the atmosphere is thick and heterogeneous
- water volume reflectance over deep waters
- is mostly at ~25, variable
- but decreases to 4 where Coastal 5 waters are observed at the end of Ampasindava Bay
|  
BLUE BOA deglinted - the atmosphere is thick and heterogeneous
- water volume reflectance over deep waters
- is mostly at ~20, variable
- but decreases to 9 where Coastal 5 waters are observed at the end of Ampasindava Bay
|
Optical calibration over the whole image  
Calibration 6,5,3,2 whole image - 0-15 m: K2/K3=0.60 OIB+0.8
- >15 m: K2/K3=0.50 OIB+0.4
| 
Calibration 6,5,3,1 whole image
the UltraBlue band_1 behaves as expected
|
Calibration 6,5,4,2 whole image
the panchromatic band_4 is under control | The calibration over the full image
captures the optical properties
of the clearest waters
But, zooming on local ROIs
reveals distinct spatial heterogeneity:
as documented below:
this cannot be overlooked
while inverting the simplified RTE.
|
Optical calibration under 8 local ROIs
Calibration under mask_E1_white - K2/K3~0.55
- The Grand Serpent shoal is ~10 m deep
| 
Calibration under mask_E2_red - 0-6 m: K2/K3 decreases from 1.0 to 0.8
- 6-~15 m: K2/K3 stable at ~0.8
- >15 m: K2/K3 clearer at ~0.7
|
Calibration under mask_E3_turquoise - K2/K3~0.58
- The Grand Banc de l'Entree shoal is ~10 m deep
| 
Calibration under mask_E4_green - K2/K3~=1.0 down to ~5 m
- becomes clearer at depth
- this case is humbling!
|
Calibration under mask_E5_black
Baie des Russes - K2/K4=K3/K4~=0.38
- therefore: K2/K3~=1.0 down to >6 m
- bottoms are fairly dark
| 
Calibration under mask_E6_purple - down to ~5 m :K2/K4=K3/K4~=0.38
- deeper than 5 m: K2/K3~=0.70
- waters become clearer at depth
- bottoms are fairly dark
|
Calibration under mask_E7_yellow - K2/K4~=0.18
- K3/K4~=0.29
- therefore: K2/K3~=0.6
- this water type OIB+0.8 is present over the whole depth range in the vicinity of Nosy Iranja island
- bottoms are fairly bright
| 
Calibration under mask_E8_pink - K2/K4~=0.9
- K3/K4~=0.7
- Kblue>Kgreen!
- therefore: K2/K3~=1.3
- this is water type Coastal C5 of Jerlov in Ampasindava Bay
|
| | |
| | |
nice -20 ./4SM.10.31 -Process/20_Nov_2020 -Origin/USGS
-dB/nb_20190813/40_3S_7S_0s/7_44/5784_6344/141.240_-1434.180
-Mis/Madagascar/NosyBe/Landsat/OLIP/TIF/bOA/UTM_+39_008/0.0150_0.0150/13_AUG_2019
-import/v/dTM/USGS*LC81590692019225LGN00
-SCL/00890/00879/00900/00846/01134/01516/01316_SCL
-Lsw/135.3/104.9/050.2/045.7/024.9/008.0/002.2_Lsw
@dLsw/-13.5/-9.9/-00.0/-01.1/-01.0/-00.3/-00.2_dLsw
-Lsw/135.3/104.9/050.2/045.7/024.9/008.0/002.2_Lsw
@dLsw/-2.2/-01.8/001.3/000.3/-00.8/-00.2/-00.0_dLsw_3180_3248_3801_3877
-dLsw/-2.2/-01.8/001.3/000.3/-00.8/-00.2/-00.0_dLsw_3180_3248_3801_3877
-La/0116.5/085.1/049.3/042.9/024.1/007.7/002.1
-La/0116.5/085.1/049.3/042.9/024.1/007.7/002.1
-M/@000001/@0002/00003/00004/@0005/@0006/00007_M
-Lm/0001.0/001.0/001.5/001.0/001.0/002.0/255.0_Lm
-Lm/0001.0/001.0/001.0/002.0/001.0/002.0/255.0_Lm
-LsM/308.7/336.2/364.6/455.0/298.9/370.1/348.6_LsM_cLM=0.950
-LsM/308.7/336.2/364.6/405.0/298.9/370.1/348.6_LsM_cLM=0.950
@KK/2_3_0.55/Knir18.7/CoefKublue_1.0/CoefKred_0.0/mask_3
-KK/2_3_1.05/Knir18.7/CoefKublue_0.9/CoefKred_0.9/mask_3
-KK/2_3_1.35/Knir18.7/CoefKublue_0.9/CoefKred_0.8/mask_3
-KK/2_3_0.50/Knir18.7/CoefKublue_0.9/CoefKred_1.0/mask_3 @FullImage
-Z/NA0.00d/N_2/nDR_43_1000_zDTM/land_10/mask_3
-B/tclNe/cNorm2.50/Bmin5/cLM 0.75 0.38 0.95 0.7 0.625 1.6 0.85 0.5
-deglint/vRbaD/F1_L7/FN/mDEGLINT1/GlintM_7
-extract/v/rawBDH/FullBDH/mapBPL/NIRband7/NIRmax255/mBPL2 20 @/mask_3
-calibrate/voAIN/BDSNpzg/BC_6_5_3_2/BDh_12_13_14
@Model/v/Rt1.00/runWV2/sharpen_s/DTM/ZM30/mask_x
-Model/v/Rt1.00/runWV2/sharpen_s/DTM/ZM30/mask_x
-Smooth/1/d/Csmooth4/Smart+ -LL/1
-Tpsv/2_4/DJI_1_0/RLD4/CoefKpan_1.00
@LUT/1_4_2/B/F/SaLut/CoefLog400/LW85/ZLUT/KKlut_0.50_0.01/Blut_200_1.00/Zlut_31_0.100_1.01
-LUT/1_4_2/B/F/SaLut/CoefLog400/LW85/zLUT/KKlut_0.50_0.01/Blut_200_1.00/Zlut_31_0.100_1.01
peer-reviewed and published in 2017 
