4SM OLIP La Parguera, Puerto Rico

The data
Deglinting
Calibration
Depth Retrievals along Green Profile
Depth Retrievals
Seatruth
Bottoms
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The data december 27th 2013

TCC raw This is december 2013
NIR raw S/N ratio: very good S/N ratio, no striping/banding Glint: no swell-modulated sea-surface glitter Aerosols: a dense atmosphere in the south half of this scene: deglinting shall remove that very efficiently	RED raw S/N ratio: very good S/N ratio, no striping/banding Glint: no swell-modulated sea-surface glitter Aerosols: a dense atmosphere in the south half of this scene: deglinting shall remove that very efficiently
NOAA LIDAR resampled to 30 m GSD	NOAA LIDAR, resampled to 30 m GSD

Deglinting works well
but waters are not homogeneous, by large

Glint regressions based on NIR

4 vs 6: note that the Panchromatic band is fuzzy
- this might be caused by time delay between spectral bands and Panchromatic band
- this might also be caused by mis-registration of the 2*2 sum-aggregated 30 m GSD Panchromatic band and spectral bands

TCC deglinted and enhanced
Turbid waters are clearly seen,
from coastline to ~10 km offshore,
moving South from Mayaguez area,
then East along LaParguera area.
area covered by mask_3 is shown

WAOH!
Radiometric quality
of this Landsat 8 image is outstanding

I feel elated striping and banding is a thing of the past this reminds me of a SPOT 5 experience a recent HICO experience This is a preview of the future in sharp contrast to my WV2 experience particularly at Oahu	This is a tribute to OLI sensor designers pre-processing at USGS but... wait Noise transfer from NIR to other bands upong deglinting is minimal unlike here The need for smoothing can be re-appreciated altogether a more respectful smart-smoothing process must be developped, so that fine details are preserved
TCC deglinted, no smoothing also shows where deep water radiance Lsw was finally measured, after considerable hesitations	RED deglinted, no smoothing
PAN deglinted, no smoothing	GREEN deglinted, no smoothing
BLUE deglinted, no smoothing	COASTAL deglinted, no smoothing

Calibration works well,
and can be tuned very accurately,
but only applies to select areas
under mask 3

Blue vs Green

Calibration diagram
for bands Blue vs Green
only under mask 3

Land pixels are clearly identified
- running the Soil Line is quite obvious
- this is done by specifying spectral LsM and Lw so that a reasonable fit is observed
LsM is set at a value that is very close to Average Coral Sand
- assuming that those eight BPL pixels represent clean coral sand is a reasonable thing to do so far away from the coast line
Lw: the curved display of land pixels shows how a reasonable estimation of Lw_blue and Lw_green may been achieved
a group of BPL pixels at depths 7-10 m represent the shelf off Mayaguez
- where bottoms that are at least ~5 times darker than coral sand
- K_blue/K_green=0.67 suits them reasonably well
a group of BPL pixels at dephs 18-25 m represent the deep outer ridge
- they exhibit a very nice linear fit: K_blue/K_green=0.67 ==>water type OII+0.1
- for blue and green wavelengths at mid-waveband

inspect 2K in m-1

Coastal vs Green

Calibration diagram
for bands Coastal vs Green
only under mask 3

Land pixels are clearly identified
Lw: the curved display of land pixels shows that a reasonable estimation of Lw_coastal and Lw_green has been achieved
BPL pixels at depths>18 m exhibit a very nice linear fit: K_coastal/K_green=0.78
- for wavelengths at mid-waveband
LsM is set at a value that is very close to Average Coral Sand

Blue vs PAN

Calibration diagram
for bands Blue vs PAN
only under mask 3
Note that the PAN band is fuzzy for land pixels.
This might be caused by slight mis-registration.

Coastal vs PAN

Calibration diagram
for bands Coastal vs PAN
only under mask 3
Note that the PAN band is fuzzy for land pixels.
This might be caused by slight mis-registration.