A time series of Landsat 8 images
at San Lorenzo Channel, Baja California


LANDSAT 8 OLIP 
 
Using the Panchromatic band for water column correction
to derive water depth and spectral bottom signature:

Landsat 8 OLIP bandset used for this work

Purple=1Blue=2Green=3PAN=4Red=5NIR=6 and SWIR1=7
Collaboration with 
Fabio Favoretto, Ph.D Student, Coralline Algae Ecology
Grupo Interdisciplinario de Ciencia Ambiental, Universidad Autonoma de Baja California Sur
Carretera al sur km 5.5  | La Paz
favorettofabio@gmail.com
Using pan sharpened images in this study
Pan sharpening by Fabio Favoretto, using R Brovey method

work done october-november 2016
Procedure/flowchart for operating  4SM.7.00

home


 
1 - NO NEED for field data, nor for atmospheric correction
2 - this is demonstrated in this website, using a variety of hyper/multi spectral data
 
Requirements are
1 - homogeneous water body and atmosphere
2 - some coverage of optically deep water
3 - some coverage of dry land
 
Problems are
1 - the precision on estimated depth is found wanting, because the noise-equivalent change in radiance  of accessible data is too high for shallow water column correction work 
2 - radiance data should be preprocessed by the provider at level 1 in order to improve S/N ratio
3 - exponential decay: the deeper/darker the bottom, the poorer the performances
 
So
I keep digging
until suitable data
become available
 



15 m GSD
NO Smoothing required!
A time series of Landsat 10 images
    continued to Combined depth  
    continued to enforcing Combined Depth
 
 
    continued to SAM  
    continued to NEW PROCESSING  
    The regression plots below reflect
  • transient water/atmosphere optical properties,
  • as well as odd features in Fabio's seatruth DTM?
Still, they demonstrate that 4SM calibration is correct
 
    December 24th 2008
Landsat TM
 
    January 12 2010
Landsat TM
 
    December 14th 2010
Landsat TM
 
    October 04th 2013
clear atmosphere
 
October 19th 2013
15m pan sharpened GSD OLI by Fabio using R 
Pansharpened image works well
  : no need to smooth   
Offset/Scaling of pansharpened bands not under control 

OII+0.2
November 4th 2013
15m pan sharpened GSD by Yann using R
Using pan sharpened OLI works well  : no need to smooth 
OII+0.3
15m pan sharpened GSD by Yann using R       January 07th 2014
PAN sharpening and 15m resampling are now available in 4SM
New SAM maps greenish and purpleish signatures separately
C1
         February 08th 2014
15m pan sharpened GSD using R does not require smoothing
15 m resampled GSD yields the same result, but requires smoothing
??OIII
October 22th 2014
15m pan sharpened GSD by Yann using R
15 m resampled GSD
OII
    January 10th 2015  
    February 11th 2015  
    February 27th 2015  
    March 15th 2015  
    Avril 16th 2015  
    May 18th 2015  
    June 3rd 2015  
    August 22nd 2015  
    October 25th 2015  
    January 13th 2016  
January 29th 2016
15m pan sharpened GSD OLI by Fabio using R 
Using pan sharpened OLI works well  : no need to smooth 
Offset/Scaling of pansharpened bands not under control
DTM very crude

OII+0.9
March 1rst 2016
15m pan sharpened GSD by Yann using R
Bad water situation

OII+0.4
    March 17th 2016  
October 11th 2016
15m pan sharpened GSD by Yann using R
Using pan sharpened OLI works well  : no need to smooth 
Offset/Scaling of pansharpened bands not under control 
Turbid waters play tricks

OIB+0.3
very clear  homogeneous waters KiKj=0.47   OIB+0.3
October 27th 2016
15m pan sharpened GSD by Yann using R
Using pan sharpened OLI works well  : no need to smooth 
Offset/Scaling of pansharpened bands not under control 
OIB+0.7
  December 14th 2016
15 m GSD by 4SM: oversampled from 30 to 15 m, and decubi'd
RMSE=1.27 m
OII+0.7
   
20131019 OII+0.2
20131104 OII+0.3
20140107 C1
20140208 OIII
20141022 OII
20150110 C1 very nice
20160129 OII+0.9
20160301 OII+0.4
20161011 OIB+0.3
20161027 OIB+0.7
20161214 OII+0.7
 
    continued to Combined depth  
    continued to SAM  
    Continued to NEW PROCESSING