LANDSAT 8 OLIP 
A time series of Landsat 8 OLIP images
at Nosy Be, Madagascar

work done in january 2021 at 15 m GSD
 
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=1Blue=2Green=3PAN=4Red=5NIR=6 and SWIR1=7

   peer-reviewed and published in 2017    
 
 
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
    • therefore: K2/K3~=1.00
  • 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 
 
 


 



 


 



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