lsiOLI20130721

scene LC80120442013202LGN00, July 21th 2013
Work done september 2016
home

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.
Smoothing applied

Regression
July 21rst 2013 vs Jan 29th 2014
This is a test of the robustness of 4SM

ZR-0.50m - ZC
Jan 29th 2014 - July 21rst 2013

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.
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 and Deglinting

TOA TCC: raw image	BOA TCC deglinted image

Deglinted TCC Please note the distinct negative bopttom contrast between waypoints 2 and 3 along Red Profile With Laswir1 =Lswswir1 at ~10 under the cloud shadows, it is seen that the atmosphere in this scene exhibits a lot of aerosols ?The atmospheric path radiance is set at 17 in the SWIR1 band: this is observed under could shadows, while the lowest sea-surface signal under sun illumination is 10 DNs stronger. this must be accomodated in the optical calibration!	Deglinting of PURPLE and SWIR1 bands along Profile Red Please note the pronounced and steady increase of the signal in the SWIR1 band from West to East: "deglinting" removes it efficiently The negative bottom contrast in the Purple band is quite pronounced between waypoints 2 and 3 along Red Profile