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=1, Blue=2, Green=3, PAN=4, Red=5, NIR=6 and SWIR1=7 |
![]() Regression October 22th 2014 vs Sonar Depths RMSE=0.95 m | ![]() Sonar Two Days seatruth depths raster not corrected for tide 15 m GSD see depth legend |
![]() Regression October 22nd 2014 vs DTM | ![]() DTM from U. of La Paz, Mexico resampled to 15 m GSD see depth legend |
![]() | ![]() Depth residuals ZDTM- Z4SM DTM - October 22nd 2014 see legend |
Reflectance max at SanLorenzoChannel It appears to be much darker than coral sand: terrigenous sediment Coral sand is ~1.7 times brighter than Brightest bottom in this scene |
ReflectanceCoralSand.........................-RM/0.310/0.380/0.440/0.550/0.560/0.670/0.700 ReflectanceMax slcOLI_20141022......-RM/0.167/0.215/0.304/0.332/0.335/0.415/0.430 |
![]() BOA CC WCC normalized BGR color composite:
| ![]() Retrieved depth see legend |
![]() SAM classified image see legend for image SAM | ![]() Average bottom brightness see legend for image B |
| What I call "average bottom brightness" is actually the average Coastal+Blue WCC reflectance scaled 0-200 What we see here: seasonal variation? |
SAM spectral angle mapper SA=(Rcoastal+Rblue)/(2*Rgreen) R values are reflectances (0-1) (SA is usually converted into radians)
Fabio, I hope you get familiar with classifications, particularly with the art of spectral angle mapping | ![]() |
type 12 pixel: SA=0.550
![]() | type 32 pixel SA=0.672
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Contains the following Channel Descriptor file="slcOLI_20141022_15mresults.pix"; 1 U8 SAM bottom typing----------------------------- 2 U8 image B average bottom brightness (0-200)----- 3 U8 image Z in decimeters------------------------- 4 U8 WCC reflectance (0-250) at 440.0 nm----------- 5 U8 WCC reflectance (0-250) at 480.0 nm----------- 6 U8 WCC reflectance (0-250) at 560.0 nm----------- 7 U8 WCC reflectance (0-250) at 590.0 nm----------- 8 U8 WCC reflectance (0-250) at 655.0 nm----------- 9 U8 WCCnormalized (0-250) at 440.0 nm>B----------- 10 U8 WCCnormalized (0-250) at 560.0 nm>G----------- 11 U8 WCCnormalized (0-250) at 480.0 nm>R----------- 12 S16 Z4SM in centimeters-------------------------- 13 S16 ZDTM in centimeters-------------------------- 14 S16 ZDTM-Z4SM in centimeters--------------------- |