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_1
of a series of 7 taken same day

e remote sensing imageries
 
 
 
Sept 23rd 2012
 
ZZRegressor: Statistics of seatruth ZC-ZR
on image waimanalowv1 at Oahu, Hawaii
N=5.394 millions pixels -E2000/5700/4500/7800 
by Morel's 4SM method

HTide=0.50 Smooth=1_5 Using_bands_1_2_3_4 cZ=1.00
 4.62% pixels with depth underestimated by more than 5.0 m
 5.42% pixels with depth underestimated by more than 3.0 m
 6.69% pixels with depth underestimated by more than 2.0 m
11.21% pixels with depth underestimated by more than 1.0 m
17.46% pixels with depth underestimated by more than 0.0 m
31.73% pixels with depth  overestimated by less than 1.0 m
16.66% pixels with depth  overestimated by less than 2.0 m
 3.69% pixels with depth  overestimated by less than 3.0 m
 1.93% pixels with depth  overestimated by less than 5.0 m
 0.61% pixels with depth  overestimated by more than 5.0 m

49.18% of computed depths are within  +-1.0 m of DTM depth
77.05% of computed depths are within  +-2.0 m of DTM depth
87.43% of computed depths are within  +-3.0 m of DTM depth
94.78% of computed depths are within  +-5.0 m of DTM depth
over a total of 100.00% of computed depths

 
  • see that many computed depths are unde-restimated
  • this is caused by the very strange performance  of the deglinting (see below)

 

ZC-ZR in centimeters

Red tones denote over-estimation of depth
Blue tones denote under-estimation of depth

see the ZC-ZR legend

Profile_yellow

ZRecorded

ZComputed





Deglinting performance is bad
 

Raw image
TCC bands 2, 3 and 4

Deglinted image
TCC bands 2, 3 and 4

Deglinting along profile_white




Deglinting performance is bad
see deglinted-smoothed band 3

Profile_white
Backdrop is TCC of deglinted image

Why this banding?

  • image is rotated by 90°

  • horizontal bands are ~1350 pixels wide

  • see that, along profile_white_B,

    • deglinting is bad as of 0.8 km

    • and improves gradually until 3.5 km

  • this is a problem of the WV2 sensor

  • this is the cause of too many "under-estimated" depths , as noted  above

  • this causes the above seatruth regression to be offset from diagonal

  • this reminds me of WV2 at Geraldton


 

glint correlations were taken in blue area

 





Water column correction

Raw image
TCC bands 2, 3 and 


 Water column corrected image
TCC bands 2, 3 and 4

  • waters in Waimanalo Bay exhibit Oceanic 1A water type of Jerlov

  • the coverage of Kanehoe Bay exhibits Coastal 1 water type: requires separate calibration and processing

  • the "pollution" is still there, but weaker and less extended than in march 2011: it mostly affects the red band which appears to "glow" by a few extra DNs
    • could it be a submerged spring of ground water?
       
  • radiometric artifacts show badly in the results
  • by far, greenish bottom types dominate the whole area
 
 


Sept 23rd 2012
nice -20  4SM.4.09  -Process  -Origin/Abileah           
-DB/waimanalowv1/47_3_16_0/8_51/9721_9721/644.132_2333.8625/1_1   
-Mis/Hawaii/Oahu/WV02/Multi/TIF/UTM_30_008/0.002_0.002/1_JUL_2012   
-LS/05000.0/5000.0/5000.0/5000.0/5000.0/5000.0/5000.0/5000.0       
-cWL/0.500/0.500/0.500/0.050/0.500/0.500/0.500/0.500_AutoCAL       
-M/@000001/@0002/00003/00004/@005/@0006/@0007/00008           
-LsM/122.2/116.0/120.0/129.5/131.5/131.1/128.8/126.0_cLM=0.55       
-Lsw/080.1/051.3/027.8/019.5/014.1/011.4/007.3/006.7_full       
-Lw/0008.6/004.7/001.0/000.7/000.8/000.0/000.0/000.0            
-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/n_2/mask_3                           
-B/TclNe/cLM1.0      -NDR_50_zDTM                   
-deglint/VRbaD/DegTol1.00/F1/L8/N1/FN/mDEGLINT1/GlintM255       
-extract/v/rawBDH/NIRband8/NIRmax5.0/fullBDH/mSOIL21/mBPL2 /Ext_7000_9721_1_2000        
-calibrate/v/BdSNpzg/BC_6_5_4_1/BDh_12_23_24               
-Model/v/runWV2/mask_3    -LL100                       
-Smooth/5/D/Smart+                           
@Recode/2_InChannel_9_into_248_OutChannel_9/land           
@Recode/248_InChannel_9_into_2_OutChannel_9/shallow           
@-E1/9721/1/9721   @-E1/9721/2700/9721  @-E1/9721/7460/9721    @-E/7000/9721/1/2000Kanehoe   
@-DN4029/4799/5BrightLand-DN1908/7158_beach_sand-DN1944/7074dark_road-DN9631/3175_dark_land 
-DN3931/4643vegetation           
@-ProfileAB/ZB/profile_white/chAB_1_2_3_4_5                            
@ProfileAB/Z/profile_red/chAB_1_2_3_4_5                            
@-RegressZZ/v/p/profile_yellow/0.001_0_0/1.000_0.0/ZR/3_6/0_201/0_50_50/*     
@RegressZZ/v/P/profile_yellow/0.001_0_0/1.000_0.0/ZM/3_6/0_201/0_50_50/*                 
-RegressZZ/v/p/DTM_10/0.001_0_0/1.000_0.0/ZR/3_4/0_201/0_50_50/* -E2000/5700/4500/7800    
 



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