lsiOLI20141113

scene LC80120442014317LGN00, Nov 13th 2014
Work done october 2016

Robustness
As I don't have seatruth data, apart from the above speaker_harris_fig_01.png,
I used results obtained on lsiOLI_20140129 as a seatruth DTM
The result is astounding,
knowing that part of the fuzziness is caused by slight misregistration of the PAN band.
No smoothing applied

Regression
Nov 13th 2014 vs Jan 29th 2014
This is a test of the robustness of 4SM

ZR - ZC
Jan 29th 2014 - Nov 13th 2014

Discrepancies
Three specific sources of discrepancies must be considered

Cloud shadows: they cause over-estimation of retrieved depths. I could not find a way to avoid it.
Misregistration: the 30 m re-sampled PAN band is misregistrated by one pixel in both row and line. This causes fuzziness, and overestimated depths on occasion.
Spatial variation of water optical properties: they cause local over -or under- estimation of retrieved depth

Robustness
The results are much more robust than I expected!
I intend to produce a Combined Depth raster
out of all these results.

Data

TOA TCC: raw image Black Holes of the Bahamas	TOA TCC Black hole is approx 2 km in diameter On this TOA TCC (logaritmic enhancenent), compared to open waters nearby, black hole exhibits Coastal band:.very low radiance..........at 430 nm Blue band: .....low radiance..................at 450 nm Green band:....slightly higher radiance at 530 nm like if black ground water were seeping from aquifer beneath
Artifact ===>>> Green-Purple tones cover the range of reflectance less than 30% of that of coral sand. The extent of Green-Purple tones gives a measure of the extent of discoloured waters.