Blue vs GREEN under mask_3  KBLUE/KGREEN=0.64 This is OII water type Maximum depth of bottom detection is ~30 m - LsM is for coral sand
- this calibration assumes that the brightest shallow pixels are located over bright coral sands
- Land pixels at depth 0 m show where the Soil Line must be placed; this is done by specifying Lw=Lsw-La in both Blue and Green bands
- Good color separation is observed
- This means that the conditions for depth retrieval are favorable
- This plot shows some signs that LswGREEN should be increased a bit
- Shallowest pixels are ~7.5 m deep
| Blue vs PAN under mask_3  KBLUE/KPAN remains <0.80 - Land pixels are more scattered than in the other plot
- this might be caused by some mis-registration of the 2*2 sum-aggregated Panchromatic band
- This plot shows signs that the calibration pf the PAN band still needs somme attention
- Stronger color separation is observed, particularly in the 0-20 m depth range
- This means that depth retrieval my be achieved in more favorable conditions
- but, in these clear OII waters:
|
 TCC raw mask_3 is shown profile_yellow is shown this open oceanic waters | Please remember - In 4SM, the BPL assumption assumes means that the optical properties of the clearest waters under the current ROI are estimated
- Should that ROI also harbour less clear water bodies, this shall generally go un-noticed and therefor shall not be accounted for
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PAN solution along profile YELLOW  Modeling by the "PAN solution" The RED profile shows LIDAR depth - from 20 to 30 km, shelf waters cause depth under-estimation
PAN and GREEN solutions yield ...... | GREEN solution along profile YELLOW  Modeling by the "GREEN solution" The RED profile shows LIDAR depth - this plot also shows water column corrected signatures for Coastal, Blue and Green bands
- topographic lows harbour the brightest bottoms (i.e. coral sands)
....approximately the same depth |
GREEN solution vs PAN solution along profile YELLOW  PAN and GREEN solutions yield approximately the same depth retrieval Minute differences allow for spectral features to appear that the GREEN solution cannot resolve | GREEN solution vs PAN solution along profile YELLOW  This confirms that the PAN solution is trustworthy to considerable advantage |
under mask 3  ZLIDAR-ZPAN under mask 3 - Calibration only used pixels inside mask_3
- BLUE: depth over-estimation
- RED: depth under-estimation
- Coastal shelf waters probably cause depth underestimation over the southern half of this area
|  ZLIDAR-ZPAN in centimeters |
Z4SM vs ZLIDAR under mask_3  Z4SM vs ZLIDAR under mask_3 - most pixels display along the diagonal: NO NEED FOR FIELD DATA!
- depth underestimation caused by coastal shelf waters shows around 13-18 m
- there is nothing we can do
- depth overestimation around 20-25 m is caused by slight overestimation of LswGREEN in the Northern area (blue tones) : water there might be slightly clearer
| ZLIDAR-ZPAN under mask_3  ZLIDAR-ZPAN under mask 3 |
mask_3 should be extenced to cover more of the deep blue areas in this image | TCC WCC mask_3 is now processed separately here  |