Optical calibration, bathymetry, water column correction and bottom typing of shallow marine areas, using passivremote sensing imageries
  
WorldView 2 image Waimanalo Beach, Oahu, Hawaii islands
July 2011, 9721*9721, 2 m ground resolution, 19.4 km * 19.4 km,   courtesy of Ron Abileah
 
[back to Oahu]

This is image_4
of a series of 7 taken same day

e remote sensing imageries


 
1 - NO NEED for field data, nor for atmospheric correction
2 - this is demonstrated in this website, using a variety of hyper/multi spectral data
 
Requirements are
1 - homogeneous water body and atmosphere
2 - some coverage of optically deep water
3 - some coverage of dry land
 
Problems are
1 - the precision on estimated depth is found wanting, because the noise-equivalent change in radiance  of accessible data is too high for shallow water column correction work 
2 - radiance data should be preprocessed by the provider at level 1 in order to improve S/N ratio
3 - exponential decay: the deeper/darker the bottom, the poorer the performances
 
So
I keep digging
until suitable data
become available
 
 



work done Sept 30rd 2012
Deglinting performance is VERY bad
 

band 7

band 8
From band_7 to band_8
the plane travelled ~18 pixels northwards ~=36 m
At ~900 km/hr, this represents
a time lapse of ~0.14 seconds between
time of imaging bands 7, 5, 3 and 2
and
time of imaging bands 8, 6, 4 and 1






Deglinting performance
is VERY bad
because of banding


 

Computed depth






Sept 30rd 2012
nice -20  4SM.4.09  -Process  -Origin/Abileah           
-DB/waimanalowv4/47_3_16_0/8_51/9721_9721/644.132_2333.8625/1_1   
-Mis/Hawaii/Oahu/WV02/Multi/TIF/UTM_30_008/0.002_0.002/01_JUL_2012   
-LS/05000.0/5000.0/5000.0/5000.0/5000.0/5000.0/5000.0/5000.0       
-cWL/0.500/0.500/0.500/0.500/0.500/0.500/0.500/0.500_AutoCAL       
-M/@000001/@0002/00003/00004/0005/@0006/@0007/00008           
-LsM/126.9/117.7/122.2/133.0/133.3/133.8/139.6/140.4_cLM=0.68       
-Lsw/83.18/53.72/28.71/19.39/14.00/11.18/07.27/06.60_AutoCal       
-Lw/0006.6/005.0/003.0/002.0/001.0/000.0/000.0/000.0            
-Lm/0001.0/001.0/001.0/005.0/005.0/005.0/255.0/255.0           
-Veg/128.5/083.1/052.2/032.3/021.9/082.9/147.9/155.6           
-SCL/00110/00087/00134/00153/00083/00149/00100/00147            
-KK2_3_0.3800/Knir8.900/mask_3WaimanaloOIwatertype           
-Z/lAT0.50/runWV2/n_2/mask_3                       
-B/tclNe/cLM1 .5 .5     -nDR_50_ZDTM                   
-deglint/VRbaD/DegTol1.00/F1/L8/N1/FN/mDEGLINT1/GlintM500       
-extract/v/rawBDH/NIRband8/NIRmax5.0/FullBDH/mSOIL21/mBPL2/Ext_1_9721_2600_7800        
-calibrate/v/BDSNpzg/BC_4_3_2_1/BDh_12_23_24               
-Model/v/runWV2/mask_3    -LL100                       
-Smooth/5/D/Smart+